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Dietary supplement

Sleep & GH Formula Peacekeeper Strawberry Kiwi Ingredients & Drug Interactions

by Warrior Labz

Sleep & GH Formula Peacekeeper Strawberry Kiwi label
See full label image
Powder Category: Other Combinations
Most serious interaction: Major
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Sleep & GH Formula Peacekeeper Strawberry Kiwi against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Major

Sleep & GH Formula Peacekeeper Strawberry Kiwi is a dietary supplement by Warrior Labz with 6 active ingredients. Its ingredients are commonly taken for anxiety and stress, sleep problems, relaxation.Based on those ingredients, 1,520 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Melatonin, Valerian extract, Hops (flower) extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Sleep & GH Formula Peacekeeper Strawberry Kiwi by Warrior Labz

Ask about any prescription or over-the-counter medication and we check it for interactions with Sleep & GH Formula Peacekeeper Strawberry Kiwi by Warrior Labz — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Sleep & GH Formula Peacekeeper Strawberry Kiwi by Warrior Labz

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 11, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 0 of its 6 active ingredients.
  • “Peacekeeper Blend” is a proprietary blend — the label gives one combined amount (2,000 mg) without saying how much of each component you get.

This powder contains six active ingredients. GABA is a brain chemical involved in relaxation.

Melatonin is a hormone your body makes naturally to regulate sleep–wake cycles. Hops flower extract comes from the hops plant used in brewing and has traditional calming properties.

Phenibut is a synthetic compound that acts on GABA receptors in the brain. Mucuna pruriens extract (also called cowhage) is a plant source of levodopa, the active compound in Parkinson's medications.

Valerian extract comes from the valerian root plant, used traditionally for sleep support. The inactive ingredients are fillers, binders, and flavoring agents.

Does it work?

Strong evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Strong

Clinical evidence supports at least one of this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: Support healthy sleep and growth hormone.
  • We looked for evidence on: Insomnia, Anxiety, Delayed sleep phase syndrome (DSPS), Jet lag, Non-24-hour sleep wake disorder, Beta blocker-induced insomnia — and 3 related terms.
  • The strongest evidence on file: Melatonin is rated "Likely Effective" for Delayed sleep phase syndrome (DSPS) (Natural Medicines).
  • Also on file: Melatonin is rated "Likely Effective" for Non-24-hour sleep wake disorder.
  • Also on file: Valerian is rated "Possibly Effective" for Insomnia.

The evidence supporting these ingredients is thin. Melatonin is likely effective for delayed sleep phase disorder and non-24-hour sleep–wake disorder, and possibly effective for pre-procedural anxiety and high blood pressure—so it has the strongest evidence in this formula.

Valerian is possibly effective for insomnia. The rest—GABA, phenibut, hops, and Mucuna pruriens—have insufficient evidence in our data to establish whether they work for any condition, including the sleep and growth-hormone support this product implies.

The evidence, ingredient by ingredient Gamma-aminobutyric Acid (gaba) Melatonin Hops Phenibut Cowhage Valerian

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 6 of the 6 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 6 of 6.
  • General safety write-ups exist for 6 of 6.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Safety data are incomplete across the board. GABA and melatonin are generally well tolerated short-term, but long-term safety hasn't been well studied.

Common side effects include drowsiness, nausea, and headache; melatonin also carries rare concerns about mood changes and seizure risk. Hops is generally well tolerated short-term and can cause drowsiness.

Phenibut is the troublemaker here—it's regarded as unsafe because it poses a high risk of dependence, severe withdrawal (including seizures and agitation after just three consecutive days of use), and overdose. Valerian is well tolerated short-term but can cause dizziness and mental slowness; stopping it abruptly after chronic use may trigger withdrawal.

Mucuna pruriens contains an active drug-like compound (levodopa) and should be used carefully. None of these ingredients have adequate pregnancy or breastfeeding safety data; most carry warnings to avoid them during these periods.

Side effects, ingredient by ingredient Gamma-aminobutyric Acid (gaba) Melatonin Hops Phenibut Cowhage Valerian

Meds to double-check

Major interaction found
Known Interaction Concern · database check
Major identified

At least one ingredient has a documented Major-severity interaction. Check your medications for a personalized result.

Why this rating?
  • 6 of the 6 matched ingredients can interact with medications — Gamma-aminobutyric Acid (gaba), Hops, Valerian, Melatonin, Cowhage, among others.
  • The most serious interaction on file is rated Major.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; seizure medications; immunosuppressants / transplant drugs; diabetes medications; Parkinson's medications.
  • For scale: 1,521 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check with your pharmacist if you take: methyldopa, non-selective MAOIs, or levodopa (Major risks from Mucuna pruriens). Blood pressure medications (Moderate risk from GABA and melatonin).

Blood thinners like warfarin (Moderate from melatonin). Diabetes medications (Moderate from melatonin and Mucuna pruriens).

Seizure medications (Moderate from melatonin). Any sedating drugs—antihistamines, benzodiazepines, opioids, other sleep aids (Moderate from GABA, phenibut, hops, valerian, and melatonin).

Phenibut itself carries major dependence and withdrawal risks.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with clinical evidence supporting its stated purpose. Major medication interactions have been identified, and safety information is well characterized.

This formula is intended for sleep and recovery, but effectiveness isn't well established for most of it, and phenibut's dependence and withdrawal risks are serious red flags. If you take any blood pressure medication, sedating drug, blood thinner, diabetes drug, seizure medication, or MAOI antidepressant, you need to check your exact medications with the tool here before starting.

Talk to your pharmacist or doctor—especially if you're pregnant, breastfeeding, or already taking prescription sleep aids.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 6 of 6 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Jan 25, 2017.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Sleep & GH Formula Peacekeeper Strawberry Kiwi, straight from the product label.

Brand Warrior Labz
Barcode (UPC) 689466847635
Net contents 150 Gram(s)
Market status Off market
Date entered into DSLD Jan 25, 2017
DSLD ID 69871
Product type Other Combinations
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Sleep & GH Formula Peacekeeper Strawberry Kiwi by Warrior Labz, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
5 Gram(s)
Maximum serving Sizes:
5 Gram(s)
Servings per container
30
UPC/BARCODE
689466847635
IngredientAmount% DV
GABA0 NP--
Melatonin0 NP--
Hops (flower) extract0 NP--
Peacekeeper Blend2000 mg--
Phenibut0 NP--
Mucuna pruriens extract0 NP--
Valerian extract0 NP--

Other ingredients: Maltodextrin, Citric Acid, Erythritol, Natural and Artificial flavors, Sucralose, Silicon Dioxide, Acesulfame K, FD&C Red #40

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Precautions

Do not use if pregnant or nursing.

To report any adverse event call 1-800-332-1088

Do not use if you are pregnant, or nursing.

Warning: Keep out of reach of children.

Do not use while operating heavy machinery. Seek advice from a health care professional if you have any pre-existing medical condition to ensure it is safe to take this product. In case of accidental overdose seek professional assistance or contact a poison control center immediately. Avoid alcohol and prescription sleep aids while taking this product. Exceeding recommended serving will not improve results and may cause serious adverse health effects. Discontinue use and contact a licensed healthcare professional immediately if you experience an unusually slow heartbeat, dizziness, severe headache, or shortness of breath.

Keep out of reach of children.

Formula

For use by healthy adults only, not recommended for persons under the age of 18.

- 150 Grams

Suggested/Recommended/Usage/Directions

Suggested use: As a dietary supplement mix 1 scoop in 8-10 oz. of water 30 minutes prior to going to bed.

FDA Statement of Identity

Dietary Supplement

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

General Statements

Made in USA

Quality - purity - potency Promotes muscle growth & recovery Natural GH stimulator Non hangover effect

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Sleep & GH Formula Peacekeeper Strawberry Kiwi by Warrior Labz label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Sleep & GH Formula Peacekeeper Strawberry Kiwi label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Sleep & GH Formula Peacekeeper Strawberry Kiwi by Warrior Labz

These are the 6 active ingredients this product is made of. Select any to open its full monograph.

Serving size5 Gram(s) Dosage formPowder Servings per container30 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Peacekeeper Blend

2000 mg per serving

Other (inactive) ingredients: Maltodextrin, Citric Acid, Erythritol, Natural and Artificial flavors, Sucralose, Silicon Dioxide, Acesulfame K, FD&C Red #40. These complete the product’s ingredient list but are not active constituents.

Interaction report

Sleep & GH Formula Peacekeeper Strawberry Kiwi by Warrior Labz Drug Interactions

Want to check YOUR meds against Sleep & GH Formula Peacekeeper Strawberry Kiwi?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
1,520Drugs
17 Major 1,184 Moderate 319 Minor

Ingredients driving the most interactions

Melatonin 1,461
Valerian extract 902
Hops (flower) extract 863
GABA 419
Phenibut 248

Individual Drug Interactions

The ingredients in Sleep & GH Formula Peacekeeper Strawberry Kiwi interact with 1,520 drugs. Click any drug to see the details.

6 of the 6 ingredients in Sleep & GH Formula Peacekeeper Strawberry Kiwi interact with drugs. Each result below shows which ingredient is responsible. Melatonin Valerian extract Hops (flower) extract GABA Phenibut Mucuna pruriens extract

Each ingredient & the kinds of drugs it affects

For each ingredient in Sleep & GH Formula Peacekeeper Strawberry Kiwi with known interactions, here are the types of medications they can affect. Open any type for the detail — or search your exact drug in the checker above.

Melatonin18 drug types · 1,461 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, melatonin may have anticoagulant effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
There are isolated case reports of minor bleeding and decreased prothrombin activity in people taking melatonin with warfarin (Coumadin). The mechanism, if any, of this interaction is unknown. Taking melatonin orally seems to decrease coagulation activity within one hour of dosing in healthy men.

Likelihood Possible Evidence B
Anticonvulsants

Theoretically, melatonin may reduce the effects of anticonvulsants. Some clinical research suggests that melatonin may increase the frequency of seizures in certain patients, particularly children with neurological impairment.

Likelihood Possible Evidence B
Antidiabetes Drugs

Theoretically, taking melatonin with antidiabetes drugs might increase the risk of hypoglycemia.
Some clinical research shows that melatonin reduces levels of fasting blood glucose and improves glycemic control. However, other research suggests that melatonin might impair glucose utilization and increase insulin resistance, while other research has found no effect on glucose levels. Until more is known, use melatonin cautiously in combination with antidiabetes drugs.

Likelihood Possible Evidence B
Antihypertensive Drugs

Theoretically, taking melatonin with antihypertensive drugs might increase the risk of hypotension or hypertension.
Some clinical research suggests that taking melatonin decreases blood pressure in healthy adults. Also, melatonin seems to lower systolic and diastolic blood pressure in individuals with high blood pressure at nighttime or untreated essential hypertension. However, melatonin seems to worsen blood pressure in patients who are taking antihypertensive medications. Immediate-release melatonin 5 mg at night in combination with nifedipine GITS (Procardia XL) increases systolic blood pressure an average of 6.5 mmHg, diastolic blood pressure by an average of 4.9 mmHg, and heart rate by 3.9 bpm. Also, results from animal research suggest that melatonin reduces the effectiveness of certain antihypertensive drugs, including methoxamine and clonidine.

Likelihood Possible Evidence A
Caffeine

Theoretically, taking caffeine with melatonin might increase levels of melatonin.
Some evidence suggests that caffeine consumption can decrease endogenous melatonin levels, while other evidence suggests that caffeine increases endogenous melatonin levels. When administered in combination with melatonin supplements, caffeine seems to increase melatonin effects and levels. The reason for this discrepancy is not completely clear. Part of the discrepancy may result from the fact that caffeine can inhibit melatonin synthesis as well as inhibit melatonin metabolism. By functioning as an adenosine receptor antagonist, caffeine may indirectly inhibit the synthesis of melatonin. Conversely, because melatonin and caffeine are both metabolized by cytochrome P450 1A2 (CYP1A2) enzyme, concomitant use of melatonin and caffeine may reduce the metabolism of melatonin, resulting in higher serum levels.

Likelihood Probable Evidence B
Cns Depressants

Theoretically, taking melatonin might increase the sedative effects of CNS depressants.
Melatonin has sedative effects. Theoretically, concomitant use of melatonin with alcohol, benzodiazepines, or other sedative drugs might cause additive sedation.

Likelihood Possible Evidence D
Contraceptive Drugs

Theoretically, taking contraceptive drugs with melatonin might increase the effects and adverse effects of melatonin.
Contraceptive drugs can increase the levels of endogenous melatonin. Theoretically, these drugs may increase the effects and adverse effects of oral melatonin.

Likelihood Probable Evidence B
Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, melatonin might increase levels of drugs metabolized by CYP1A2. Also, other CYP1A2 substrates might decrease the metabolism of melatonin, increasing melatonin levels.
Melatonin is metabolized in the liver primarily by the CYP2C19 and CYP1A2 enzymes. Theoretically, combined administration of melatonin with drugs metabolized by the CYP1A2 enzyme might reduce the metabolism of these drugs, resulting in increased serum levels. Conversely, some drugs metabolized by CYP1A2 may inhibit the metabolism of melatonin, resulting in increased serum levels of melatonin. Until more is known, use melatonin cautiously in patients taking drugs metabolized by these enzymes.

Likelihood Probable Evidence D
Cytochrome P450 2C19 (Cyp2C19) Substrates

Theoretically, melatonin might increase levels of drugs metabolized by CYP2C19. Also, other CYP2C19 substrates might decrease the metabolism of melatonin, increasing melatonin levels.
Melatonin is metabolized in the liver primarily by the CYP2C19 and CYP1A2 enzymes. Theoretically, combined administration of melatonin with certain drugs metabolized by the CYP2C19 enzyme may reduce the metabolism of these drugs, resulting in increased serum levels. Conversely, some drugs metabolized by CYP2C19 may inhibit the metabolism of melatonin, resulting in increased serum levels of melatonin. Until more is known, use melatonin cautiously in patients taking drugs metabolized by these enzymes.

Likelihood Probable Evidence D
Fluvoxamine (Luvox)

Theoretically, taking fluvoxamine with melatonin might increase levels of melatonin.
Fluvoxamine can significantly increase melatonin levels. In some cases, fluvoxamine might increase bioavailability of exogenously administered melatonin by up to 20 times. Some researchers think this might be a beneficial interaction and be potentially useful for cases of refractory insomnia. However, this interaction might also cause unwanted excessive drowsiness and possibly other adverse effects. Fluvoxamine is known to increase endogenous melatonin secretion. It seems to increase serum levels of exogenously administered melatonin possibly by decreasing melatonin metabolism by inhibiting cytochrome P450 (CYP450) 1A2 and 2C19 or by inhibiting melatonin elimination. This effect has been found in healthy people taking fluvoxamine 50-75 mg and melatonin 5 mg.

Likelihood Probable Evidence B
Immunosuppressants

Theoretically, melatonin might interfere with immunosuppressive therapy.
Melatonin can stimulate immune function. Theoretically, melatonin might interfere with immunosuppressive therapy.

Likelihood Possible Evidence B
Methamphetamine (Desoxyn)

Theoretically, taking melatonin with methamphetamine may increase the adverse effects of methamphetamine.
Animal research suggests that melatonin exacerbates the adverse effects of methamphetamine, resulting in greater depression of tryptophan hydroxylase (TPH) and tyrosine hydroxylase (TH) activity, as well as a significant reduction in dopamine levels. This has not been shown in humans.

Likelihood Possible Evidence D
Nifedipine Gits (Procardia Xl)

Theoretically, taking melatonin with extended release nifedipine reduces the effects of nifedipine.
Melatonin can decrease the effectiveness of extended release nifedipine (GITS). Immediate-release melatonin 5 mg at night in combination with nifedipine GITS 30-60 mg daily increases systolic and blood pressure by an average of 6.5 mmHg and 4.9 mmHg, respectively. Concomitant use with melatonin also increases heart rate by 3.9 bpm. The mechanism of this interaction is not known.

Likelihood Probable Evidence B
Seizure Threshold Lowering Drugs

Theoretically, taking melatonin with drugs that lower the seizure threshold might increase the risk of seizure activity.
Some clinical evidence suggests that melatonin may increase the frequency of seizures in certain patients, particularly children with neurological disabilities.

Likelihood Possible Evidence D
Warfarin (Coumadin)

Theoretically, melatonin may have antiplatelet effects and may increase the risk of bleeding with warfarin.
Three cases of increased prothrombin time have been reported for patients aged 48-72 years who took melatonin orally in combination with warfarin. However, three cases of decreased prothrombin time have also been reported for patients aged 51-84 years who took melatonin orally in combination with warfarin. Until more is known, use melatonin cautiously in patients taking warfarin.

Likelihood Possible Evidence D
Cytochrome P450 2D6 (Cyp2D6) Substrates

Theoretically, melatonin might increase levels of drugs metabolized by CYP2D6.
Laboratory research suggests that certain lots of melatonin inhibit CYP2D6. Theoretically, combined administration of melatonin with certain drugs metabolized by the CYP2D6 enzyme may reduce the metabolism of these drugs, resulting in increased serum levels. Until more is known, use melatonin cautiously in patients taking drugs metabolized by these enzymes.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, melatonin might increase levels of drugs metabolized by CYP3A4.
Laboratory research shows that certain lots of melatonin inhibit CYP3A4. Theoretically, combined administration of melatonin with certain drugs metabolized by CYP3A4 may reduce the metabolism of these drugs, resulting in increased serum levels. Until more is known, use melatonin cautiously in patients taking drugs metabolized by these enzymes.

Likelihood Possible Evidence D
Flumazenil (Romazicon)

Theoretically, taking flumazenil with melatonin might reduce the effects of melatonin.
Animal research shows that flumazenil may inhibit the effect of melatonin.

Likelihood Possible Evidence D
Melatonin full monograph & interactions

Valerian extract6 drug types · 902 drugs

Alcohol (Ethanol)

Valerian can have additive sedative effects when used concomitantly with alcohol.
Valerian has sedative effects. Theoretically, valerian might have an additive sedative effect when combined with alcohol. Excessive sedation has been reported in an alcohol-abusing individual who took valerian and Gingko biloba. However, the potential interaction between valerian and alcohol has been disputed in other research. Limited evidence suggests that a combination of valerian 160 mg and lemon balm 80 mg (Euvegal) does not cause further deterioration in reaction ability and reaction rate when taken with alcohol as compared to the effects of alcohol alone.

Likelihood Possible Evidence B
Alprazolam (Xanax)

Valerian can have additive sedative effects when used with alprazolam. Also, valerian in high doses might modestly increase alprazolam levels, though this is not likely to be clinically significant.
Valerian has sedative effects. Theoretically, valerian might cause additive sedation when combined with alprazolam. Also, a small pharmacokinetic study shows that taking valerian extract 1000 mg daily (providing 11 mg valerenic acid) might increase alprazolam levels by about 19%. This might be due to valerian's mild inhibition of cytochrome P450 3A4 (CYP3A4). Despite being statistically significant, this increase is not likely to be clinically significant.

Likelihood Possible Evidence B
Cns Depressants

Valerian can have additive sedative effects when used concomitantly with CNS depressant drugs.
Theoretically, concomitant use of valerian and drugs with sedative and anesthetic properties may cause additive therapeutic and adverse effects.

Likelihood Possible Evidence D
Glucuronidated Drugs

Valerian might weakly inhibit glucuronidation and increase concentrations of drugs metabolized by UGT1A1 and UGT2B7.
In vitro research shows that methanolic valerian extract and valerenic acid might competitively inhibit UDP-glucuronosyltransferase (UGT) 1A1 (UGT1A1) and UGT2B7.

Likelihood Possible Evidence D
Cytochrome P450 2D6 (Cyp2D6) Substrates

Valerian does not seem to have a clinically relevant effect on levels of drugs metabolized by CYP2D6.
Although some in vitro evidence suggests that valerian affects CYP2D6, clinical pharmacokinetic (PK) studies show that valerian is unlikely to affect the CYP2D6 enzyme. In one PK study, taking valerian 1000 mg (providing about 11 mg valerenic acid) nightly for 14 days did not affect the metabolism of dextromethorphan, a CYP2D6 substrate. In another PK study, taking valerian 125 mg three times daily for 28 days did not affect metabolism of debrisoquine, an accepted CYP2D6 probe-substrate.

Likelihood Unlikely Evidence B
Cytochrome P450 3A4 (Cyp3A4) Substrates

Valerian does not seem to have a clinically relevant effect on levels of drugs metabolized by CYP3A4.
Although some in vitro evidence suggests that valerian extract might inhibit or induce CYP3A4, clinical pharmacokinetic (PK) studies show that valerian does not have a clinically significant effect on the CYP3A4 enzyme. In one PK study, taking valerian 125 mg three times daily for 28 days did not affect metabolism of midazolam, an accepted CYP3A4 probe-substrate. In another PK study, taking valerian 1000 mg (providing about 11 mg valerenic acid) nightly for 14 days modestly increases levels of alprazolam, a CYP3A4 substrate, suggesting mild inhibition of CYP3A4. However, this mild inhibition is unlikely to be clinically relevant.

Likelihood Possible Evidence B
Valerian extract full monograph & interactions

Hops (flower) extract4 drug types · 863 drugs

Cns Depressants

Theoretically, concomitant use of hops with sedative drugs might cause additive sedation.
Some animal research shows that hops has sedative effects.

Likelihood Possible Evidence D
Estrogens

Theoretically, concomitant use of large amounts of hops might interfere with hormone replacement therapy due to competition for estrogen receptors.
In vitro research suggests that certain hops constituents can competitively bind to estrogen receptors. However, most hops extracts contain very small amounts of these constituents.

Likelihood Possible Evidence D
Cytochrome P450 1A2 (Cyp1A2) Substrates

Hops extract does not seem to affect the metabolism of CYP1A2 substrates.
In vitro research suggests that flavonoid constituents of hops inhibit CYP1A2 enzyme activity. However, a pharmacokinetic study in healthy postmenopausal patients shows that taking a standardized extract of spent hops containing prenylated phenols, as 59.5 mg twice daily for 2 weeks, does not affect levels of caffeine, a CYP1A2 probe substrate.

Likelihood Unlikely Evidence D
Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, hops extract might alter metabolism of CYP3A4 substrates; however, this effect may not be clinically significant.
Animal research suggests that specific constituents of hops, called lupulones, can induce hepatic CYP3A4 enzyme activity. However, a pharmacokinetic study in healthy postmenopausal patients with normal metabolism shows that taking a standardized extract of spent hops containing prenylated phenols, as 59.5 mg twice daily for 2 weeks, decreases the concentration of alprazolam, a CYP3A4 probe substrate, by 7.6%. This reduction is unlikely to be clinically relevant.

Likelihood Possible Evidence D
Hops (flower) extract full monograph & interactions

GABA2 drug types · 419 drugs

Antihypertensive Drugs

Theoretically, taking GABA with antihypertensive drugs might increase the risk of hypotension.
Some clinical research shows that GABA can decrease blood pressure in patients with hypertension.

Likelihood Possible Evidence B
Cns Depressants

Theoretically, GABA might have additive sedative effects when used in conjunction with CNS depressants. However, it is unclear if this concern is clinically relevant.
Endogenous GABA has well-established relaxant effects and GABA(A) receptors have an established physiological role in sleep. However, the effects of GABA supplements are unclear, as it is unknown whether exogenous GABA crosses the blood-brain barrier. Although there have been limited reports of drowsiness or tiredness with GABA supplements, these effects have not been widely reported in clinical studies. Additionally, intravenous GABA 0.1-1 mg/kg has been shown to induce anxiety in a dose-dependent manner.

Likelihood Unlikely Evidence D
GABA full monograph & interactions

Phenibut2 drug types · 248 drugs

Cns Depressants

Theoretically, phenibut might increase the risk of sedation and respiratory depression when taken with CNS depressants.
Phenibut has been associated with sedation and respiratory depression in several case reports, especially when taken at high doses.

Likelihood Possible Evidence D
Pregabalin (Lyrica)

Theoretically, phenibut might increase the risk for additive adverse effects, including sedation, when taken with pregabalin.
Phenibut is structurally related to pregabalin, and both chemicals act at GABA receptors in the brain. In a case report, a patient who had experienced tolerance to the effects of pregabalin for treatment of chronic neuropathic pain experienced a reduction in tolerance when phenibut was taken concurrently.

Likelihood Possible Evidence D
Phenibut full monograph & interactions

Mucuna pruriens extract8 drug types · 193 drugs

Levodopa

Concomitant use can increase the risk of levodopa-related adverse effects.
Cowhage contains levodopa. Some cowhage products have been standardized to contain 75-400 mg of levodopa per dose.

Likelihood Likely Evidence D
Methyldopa (Aldomet)

Theoretically, concomitant use of cowhage and methyldopa might increase the risk of hypotension.
Cowhage contains levodopa. Use of levodopa with methyldopa might cause additive hypotension. In addition, methyldopa may inhibit peripheral decarboxylation of levodopa and increase levodopa levels in the central nervous system; avoid using.

Likelihood Probable Evidence D
Monoamine Oxidase Inhibitors (Maois)

Theoretically, concomitant use of cowhage and non-selective MAOIs might increase the risk of hypertensive crisis.
Cowhage contains levodopa. Use of levodopa with non-selective MAOIs might cause hypertensive crisis. However, this interaction has not been reported with MAO-B selective inhibitors such as selegiline.

Likelihood Probable Evidence D
Anesthesia

Theoretically, concomitant use of cowhage and anesthesia might increase the risk of arrhythmias.
Cowhage contains levodopa. Use of levodopa with cyclopropane or halogenated hydrocarbon anesthesia has led to arrhythmias. Other anesthetics have not been implicated. Use other anesthetics in patients taking cowhage or tell patients to stop taking cowhage at least 2 weeks before surgery.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, concomitant use of cowhage and antidiabetes drugs might increase the risk of hypoglycemia.
Animal research shows that cowhage might have hypoglycemic effects.

Likelihood Possible Evidence D
Antipsychotic Drugs

Theoretically, use of cowhage might decrease the clinical effects of antipsychotic drugs.
Cowhage contains levodopa. Use of levodopa might counteract the antidopaminergic effects of antipsychotic medications.

Likelihood Possible Evidence D
Guanethidine (Ismelin)

Theoretically, concomitant use of cowhage and guanethidine might increase the risk of hypotension.
Cowhage contains levodopa. Use of levodopa with guanethidine might cause additive hypotension; avoid using.

Likelihood Probable Evidence D
Tricyclic Antidepressants (Tcas)

Theoretically, use of TCAs might reduce the levels and clinical effects of cowhage.
Cowhage contains levodopa. Use of TCAs might reduce the absorption of levodopa. Some case reports describe patients that developed hypertension and dyskinesia when taking both levodopa and TCAs.

Likelihood Possible Evidence D
Mucuna pruriens extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Sleep & GH Formula Peacekeeper Strawberry Kiwi, from the product label.

Warrior Labz

See all Warrior Labz products
Name
WARRIOR LABZ
Street Address
1400 Pensacola St
City
Honolulu
State
HI
ZipCode
96822
Web Address
www.WARRIORLABZ.com
Pharmacist Counseling Corner

Sleep & GH Formula Peacekeeper Strawberry Kiwi by Warrior Labz: Common Questions

Does Sleep & GH Formula Peacekeeper Strawberry Kiwi by Warrior Labz interact with any medications?
Yes. Based on its ingredients, Sleep & GH Formula Peacekeeper Strawberry Kiwi has a known interaction with 1,520 medications, including 17 rated major. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Sleep & GH Formula Peacekeeper Strawberry Kiwi contains 6 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Is it safe to take this while I'm pregnant?
There isn't enough safety data for any of the ingredients during pregnancy. Melatonin is rated possibly unsafe. Most others carry warnings to avoid them. Talk with your doctor before taking this product if you're pregnant or planning to become pregnant.
Can I take this while breastfeeding?
No, safety data aren't available for breastfeeding with any of these ingredients. GABA, hops, and valerian all carry advice to avoid them while breastfeeding. Mucuna pruriens is of special concern because levodopa can lower prolactin and reduce milk supply. Ask your doctor before use.
What's phenibut and why is it in a sleep supplement?
Phenibut is a synthetic GABA-like compound meant to promote relaxation. However, it's regarded as unsafe because it's highly addictive and can cause severe withdrawal—including seizures, hallucinations, and high blood pressure—after just three days of use. It's not approved as a supplement or drug in the U.S. This is a major safety concern.
Why does this contain levodopa (from Mucuna pruriens)?
Mucuna pruriens is a plant source of levodopa, a compound used in Parkinson's disease treatment. It may affect dopamine levels in the brain and theoretically influence growth hormone. However, levodopa carries major risks with certain medications, so this ingredient requires careful screening with a doctor or pharmacist before you use this product.
Will I feel drowsy from this?
Drowsiness is a common side effect of melatonin, GABA, hops, valerian, and phenibut. It's very likely you'll experience sedation if you're sensitive to these ingredients, especially if you combine this with other sleep aids or sedating medications. Don't drive or operate machinery until you know how it affects you.
Can I stop taking this anytime, or do I need to wean off?
If you take this for a long time and then stop abruptly, valerian and phenibut can trigger withdrawal symptoms—including insomnia, anxiety, agitation, and (with phenibut) seizures. It's safest to taper doses slowly rather than quit cold turkey. Check with your pharmacist about the best way to stop.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Sleep & GH Formula Peacekeeper Strawberry Kiwi is safe with your meds?

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Sleep & GH Formula Peacekeeper Strawberry Kiwi label
Go deeper

The Full Monographs Behind Sleep & GH Formula Peacekeeper Strawberry Kiwi’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Gamma-aminobutyric Acid (gaba)

Interacts with 419 drugs

GABA is a calming chemical messenger (neurotransmitter) that your body makes on its own, and it is sold as a supplement for stress, anxiety, and sleep. The science behind oral GABA supplemen...

Read the full Gamma-aminobutyric Acid (gaba) monograph → Herb & supplement monograph

Melatonin

Interacts with 1,461 drugs

Melatonin is a hormone your body makes naturally to help control your sleep-wake cycle, and the supplement form is widely used to help with sleep timing problems and jet lag. The evidence is...

Read the full Melatonin monograph → Herb & supplement monograph

Hops

Interacts with 863 drugs

Hops are most often used for sleep and mild anxiety, frequently combined with valerian, but the human evidence is limited and not very strong. They are generally well tolerated when used sho...

Read the full Hops monograph → Herb & supplement monograph

Phenibut

Interacts with 248 drugs

Phenibut is a synthetic, lab-made central nervous system depressant—not a natural herb—that some people use for anxiety and sleep, but it carries a serious risk of tolerance, dependence, and...

Read the full Phenibut monograph → Herb & supplement monograph

Cowhage

Interacts with 193 drugs

Cowhage (Mucuna pruriens) is a tropical legume best known as a natural source of L-dopa, the compound the body turns into dopamine. It is most studied for Parkinson's disease symptoms and ma...

Read the full Cowhage monograph → Herb & supplement monograph

Valerian

Interacts with 902 drugs

Valerian is an herb whose root is widely used as a natural sleep aid and for calming nerves. The evidence is mixed and often weak, so it may help some people sleep but does not work reliably...

Read the full Valerian monograph →
Sources

Sources & How We Checked

Sleep & GH Formula Peacekeeper Strawberry Kiwi's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 217 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Gamma-aminobutyric Acid (gaba) 12 references
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  3. Gershman RN, Vasilenko MA, Iliushina GG, et al. [Gammalon in the rehabilitation in infantile cerebral palsy]. Pediatr.Akus.Ginekol. 1977;(6):26-7.
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  6. ELLIOTT, K. A. and JASPER, H. H. Gammaaminobutyric acid. Physiol Rev. 1959;39(2):383-406.
  7. Winsky-Sommerer, R. Role of GABAA receptors in the physiology and pharmacology of sleep. Eur.J.Neurosci. 2009;29(9):1779-1794.
  8. Meldrum, B. S. GABAergic mechanisms in the pathogenesis and treatment of epilepsy. Br.J.Clin.Pharmacol. 1989;27 Suppl 1:3S-11S. PubMed
  9. Loeb, C., Marinari, U. M., Benassi, E., Besio, G., Cottalasso, D., Cupello, A., Maffini, M., Mainardi, P., Pronzato, M. A., and Scotto, P. A. Phosphatidylserine increases in vivo the synaptosomal uptake of exogenous GABA in rats. Exp.Neurol. 1988;99(2):4 PubMed
  10. Melis, G. B., Paoletti, A. M., Mais, V., and Fioretti, P. Interference of dopamine infusion on gamma-amino butyric acid (GABA)-stimulated prolactin increase. J.Endocrinol.Invest 1980;3(4):445-448.
  11. Boonstra E, de Kleijn R, Colzato LS, Alkemade A, Forstmann BU, Nieuwenhuis S. Neurotransmitters as food supplements: the effects of GABA on brain and behavior. Front Psychol. 2015 Oct 6;6:1520. doi: 10.3389/fpsyg.2015.01520. eCollection 2015. PubMed
  12. de Bie TH, Witkamp RF, Balvers MG, Jongsma MA. Effects of ?-aminobutyric acid supplementation on glucose control in adults with prediabetes: A double-blind, randomized, placebo-controlled trial. Am J Clin Nutr 2023;118(3):708-719. PubMed

See these in context on the Gamma-aminobutyric Acid (gaba) monograph →

Melatonin 118 references
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Hops 15 references
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Phenibut 23 references
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Cowhage 12 references
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Valerian 37 references
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