Major interaction on record — check this product against your medications before combining. Check your meds →
Dietary supplement

Lan Gui Ren Oolong Tea Ingredients & Drug Interactions

by Raw Forest Foods

Lan Gui Ren Oolong Tea label
See full label image
Powder Category: Botanical
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 Lan Gui Ren Oolong Tea 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

Lan Gui Ren Oolong Tea is a dietary supplement by Raw Forest Foods with 3 active ingredients. Its ingredients are commonly taken for weight management, mental alertness and energy, heart health.Based on those ingredients, 1,386 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Licorice, Powder, Oolong Tea, American Ginseng, Powder. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Lan Gui Ren Oolong Tea by Raw Forest Foods

Ask about any prescription or over-the-counter medication and we check it for interactions with Lan Gui Ren Oolong Tea by Raw Forest Foods — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Lan Gui Ren Oolong Tea by Raw Forest Foods

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

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 3 of its 3 active ingredients.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains three active ingredients: oolong tea, American ginseng powder, and licorice powder. Oolong tea is a caffeinated leaf that's been used for its stimulant properties.

American ginseng is an herbal root traditionally used to support immune function and general wellness. Licorice powder comes from the licorice root and is used in herbal medicine for various purposes.

There are no inactive ingredients listed for this product.

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: tonic and adaptogenic herbs for wellness.
  • We looked for evidence on: Cognitive function, Mental alertness, Athletic performance, Physical performance, Immune support, General wellness — and 1 related terms.
  • The strongest evidence on file: Oolong Tea is rated "Likely Effective" for Mental alertness (Natural Medicines).
  • Also on file: Licorice is rated "Insufficient Reliable Evidence To Rate" for Physical performance.
  • Also on file: American Ginseng is rated "Insufficient Reliable Evidence To Rate" for Athletic performance, Cognitive function.

The evidence for this product's effectiveness is mixed and limited. Oolong tea is rated likely effective for mental alertness, but we hold insufficient evidence to rate it for autism spectrum disorder, osteoporosis prevention, or oral cancer risk.

American ginseng is rated possibly effective for upper respiratory tract infections, but we lack reliable evidence for anemia of chronic disease or breast cancer. Licorice is rated possibly effective for atopic dermatitis (eczema) and canker sores, but insufficient evidence exists for Addison disease or asthma.

Overall, the strongest claim is for oolong tea and mental alertness; the other uses need more research.

The evidence, ingredient by ingredient Oolong Tea American Ginseng Licorice

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 3 of the 3 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 3 of 3.
  • General safety write-ups exist for 3 of 3.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Oolong tea is generally well tolerated when consumed in moderate amounts. The most common side effects come from its caffeine content and include insomnia, nervousness, restlessness, rapid heartbeat, and tremors.

Rare serious effects attributed to caffeine include irregular heartbeat, chest pain, and seizures. Caffeine passes into breast milk and can make babies fussy, so keep intake low if breastfeeding.

Limit caffeine during pregnancy and check with your doctor before regular use. American ginseng is generally well tolerated short-term in healthy adults, though long-term safety isn't well studied and quality varies between products.

Headache has been reported. Ginseng is rated possibly unsafe in pregnancy and should be avoided while breastfeeding due to insufficient safety data.

Licorice is generally well tolerated in small food amounts, but its active compound glycyrrhizin can cause serious problems at high doses or with long-term use. Common side effects include headache, nausea, and vomiting.

Licorice is rated unsafe in pregnancy due to links to harmful effects and should be avoided while breastfeeding.

Side effects, ingredient by ingredient Oolong Tea American Ginseng Licorice

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?
  • 3 of the 3 matched ingredients can interact with medications — Licorice, American Ginseng, Oolong Tea.
  • The most serious interaction on file is rated Major.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; immunosuppressants / transplant drugs; diabetes medications; heart-rhythm medications; lithium.
  • For scale: 1,387 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.

Before taking this product, double-check with your pharmacist if you take ephedrine (Major risk from oolong tea), warfarin or other blood thinners (American ginseng and licorice may reduce effectiveness), antipsychotics like clozapine, seizure medicines, diabetes medications, digoxin or other heart drugs, loop diuretics, cancer treatments (cisplatin, paclitaxel), midazolam, immunosuppressants, MAOIs, or any drug metabolized through liver pathways CYP2B6 or CYP2C19. These span Moderate interactions at minimum.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with clinical evidence supporting its stated purpose. Major medication interactions have been identified, and safety information is well characterized.

This tea is primarily useful if you're looking for a mental boost from oolong tea's caffeine. If you take any blood thinners, heart medications, antipsychotics, seizure medications, diabetes drugs, immunosuppressants, or antidepressants—or if you take ephedrine—check your exact medications with the tool on this page before you start.

Pregnant people and those breastfeeding should talk with their pharmacist first.

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

Assessment coverage: 3 of 3 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated May 23, 2024.

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 Lan Gui Ren Oolong Tea, straight from the product label.

Brand Raw Forest Foods
Barcode (UPC) 850004627099
Net contents 2.47 Ounce(s); 70 Gram(s)
Market status On market
Date entered into DSLD May 23, 2024
DSLD ID 309791
Product type Botanical
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Women (not pregnant or lactating), Dairy Free
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 Lan Gui Ren Oolong Tea by Raw Forest Foods, 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:
4000 mg
Maximum serving Sizes:
4000 mg
Servings per container
18
UPC/BARCODE
850004627099
IngredientAmount% DV
Oolong Tea3760 mg--
American Ginseng, Powder80 mg--
Licorice, Powder160 mg--

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.
Formulation

Ceremonial grade First flush Hand-rolled Legacy plantation Ready to use

No fillers, drying agents, and never irradiated. This product is GMO free.

Vegan

Formula

Oolong tea, American ginseng, & licorice root

FDA Statement of Identity

Dietary Supplement

General Statements

Founded in 2010, RAW Forest Foods is your home for tonic and adaptogenic herbs and supplements. We proudly - artfully and professionally - craft products meeting our own discerningly high standards, which we share with you. Using hand-selected, premier ingredients, and formulated by our master herbalists, we invite your to discover the infinite power within.

Suggested/Recommended/Usage/Directions

Suggested usage: As a dietary supplement, adults use 4 grams (roughly 1 teaspoon) per serving, preferably on an empty stomach, taken 1-2 times per day. As with all dietary supplements, please consult a qualified healthcare practitioner prior to use. Brewing instructions: Using 4 grams (roughly 1 teaspoon) of tea, steep with 8-12 ounces of hot water (190 degrees F) for 5-8 minutes. This tea can be steeped between 4 and 6 times. Enjoy.

Precautions

Warning: Not for use by those under the age of 18, who are pregnant or nursing, who are allergic or adverse to any of the ingredients contained within. Keep out of the reach of children.

Warning: Not for use by those under the age of 18, who are pregnant or nursing, who are allergic or adverse to any of the ingredients contained within.

Warning: Not for use by those under the age of 18, who are pregnant or nursing, who are allergic or adverse to any of the ingredients contained within.

Do not use if safety seal is damaged or missing.

Storage

Store in a cool, dry place.

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.

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

See for yourself

Lan Gui Ren Oolong Tea by Raw Forest Foods label

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

Lan Gui Ren Oolong Tea 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 Lan Gui Ren Oolong Tea by Raw Forest Foods

These are the 3 active ingredients this product is made of. Select any to open its full monograph.

Serving size4000 mg Dosage formPowder Servings per container18 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.

Oolong Tea

Interacts with
652 drugs
3760 mg per serving Form: Camellia sinensis

Oolong tea is a traditional partially oxidized tea made from the same plant as green and black tea, and it provides caffeine and plant antioxidants. A...

Oolong Tea monograph & interactions

American Ginseng, Powder

Interacts with
217 drugs
80 mg per serving Form: Panax quinquefolius, Powder, Panax quinquefolius, Powder

American ginseng is an herbal root used as an 'adaptogen' to support energy, stress, immune function, and blood sugar. Some uses—such as reducing the...

American Ginseng, Powder monograph & interactions

Licorice, Powder

Interacts with
1,040 drugs
160 mg per serving Form: Miltiorrhiza glabra, Powder

Licorice root is a traditional remedy used for sore throats, coughs, and digestive complaints, but solid human evidence is limited for most uses. Regu...

Licorice, Powder monograph & interactions
Interaction report

Lan Gui Ren Oolong Tea by Raw Forest Foods Drug Interactions

Want to check YOUR meds against Lan Gui Ren Oolong Tea?

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
1,386Drugs
10 Major 1,302 Moderate 74 Minor

Ingredients driving the most interactions

Licorice, Powder 1,040
Oolong Tea 652
American Ginseng, Powder 217

Individual Drug Interactions

The ingredients in Lan Gui Ren Oolong Tea interact with 1,386 drugs. Click any drug to see the details.

3 of the 3 ingredients in Lan Gui Ren Oolong Tea interact with drugs. Each result below shows which ingredient is responsible. Licorice, Powder Oolong Tea American Ginseng, Powder

Each ingredient & the kinds of drugs it affects

For each ingredient in Lan Gui Ren Oolong Tea 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.

Licorice, Powder18 drug types · 1,040 drugs

Antihypertensive Drugs

Theoretically, licorice might reduce the effects of antihypertensive drugs.
In human research, licorice increases blood pressure in a dose-dependent manner.

Likelihood Possible Evidence B
Cisplatin (Platinol-Aq)

Theoretically, licorice might reduce the effects of cisplatin.
In animal research, licorice diminished the therapeutic efficacy of cisplatin.

Likelihood Possible Evidence D
Corticosteroids

Theoretically, concomitant use of licorice and corticosteroids might increase the side effects of corticosteroids.
Case reports suggest that concomitant use of licorice and oral corticosteroids, such as hydrocortisone, can potentiate the duration of activity and increase blood levels of corticosteroids. Additionally, in one case report, a patient with neurogenic orthostatic hypertension stabilized on fludrocortisone 0.1 mg twice daily developed pseudohyperaldosteronism after recent consumption of large amounts of black licorice.

Likelihood Possible Evidence D
Cytochrome P450 2B6 (Cyp2B6) Substrates

Theoretically, licorice might increase levels of drugs metabolized by CYP2B6.
In vitro research shows that licorice extract and glabridin, a licorice constituent, inhibit CYP2B6 isoenzymes. Licorice extract from the species G. uralensis seems to inhibit CYP2B6 isoenzymes to a greater degree than G. glabra extract in vitro. Theoretically, these species of licorice might increase levels of drugs metabolized by CYP2B6; however, these interactions have not yet been reported in humans.

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

Theoretically, licorice might increase levels of drugs metabolized by CYP2C19.
In vitro, licorice extracts from the species G. glabra and G. uralensis inhibit CYP2C19 isoenzymes in vitro. Theoretically, these species of licorice might increase levels of drugs metabolized by CYP2C19; however, this interaction has not yet been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2C8 (Cyp2C8) Substrates

Theoretically, licorice might increase levels of drugs metabolized by CYP2C8.
In vitro, licorice extract from the species G. glabra and G. uralensis inhibits CYP2C8 isoenzymes. Theoretically, these species of licorice might increase levels of drugs metabolized by CYP2C8; however, this interaction has not yet been reported in humans.

Likelihood Possible Evidence D
Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, licorice might increase or decrease levels of drugs metabolized by CYP2C9.
There is conflicting evidence about the effect of licorice on CYP2C9 enzyme activity. In vitro research shows that extracts from the licorice species G. glabra and G. uralensis moderately inhibit CYP2C9 isoenzymes. However, evidence from an animal model shows that licorice extract from the species G. uralensis can induce hepatic CYP2C9 activity. Until more is known, licorice should be used cautiously in people taking CYP2C9 substrates.

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

Theoretically, licorice might increase or decrease levels of drugs metabolized by CYP3A4.
Pharmacokinetic research shows that the licorice constituent glycyrrhizin, taken in a dosage of 150 mg orally twice daily for 14 days, modestly decreases the area under the concentration-time curve of midazolam by about 20%. Midazolam is a substrate of CYP3A4, suggesting that glycyrrhizin modestly induces CYP3A4 activity. Animal research also shows that licorice extract from the species G. uralensis induces CYP3A4 activity. However, licorice extract from G. glabra species appear to inhibit CYP3A4-induced metabolism of testosterone in vitro. It is thought that the G. glabra inhibits CYP3A4 due to its constituent glabridin, which is a moderate CYP3A4 inhibitor in vitro and not present in other licorice species. Until more is known, licorice should be used cautiously in people taking CYP3A4 substrates.

Likelihood Possible Evidence B
Digoxin (Lanoxin)

Theoretically, concomitant use of licorice with digoxin might increase the risk of cardiac toxicity.
Overuse or misuse of licorice with cardiac glycoside therapy might increase the risk of cardiac toxicity due to potassium loss.

Likelihood Possible Evidence D
Diuretic Drugs

Theoretically, concomitant use of licorice with diuretic drugs might increase the risk of hypokalemia.
Overuse of licorice might compound diuretic-induced potassium loss. In one case report, a 72-year-old male with a past medical history of hypertension, type 2 diabetes, hyperlipidemia, arrhythmia, stroke, and hepatic dysfunction was hospitalized with severe hypokalemia and uncontrolled hypertension due to pseudohyperaldosteronism. This was thought to be provoked by concomitant daily consumption of a product containing 225 mg of glycyrrhizin, a constituent of licorice, and hydrochlorothiazide 12.5 mg for 1 month.

Likelihood Possible Evidence D
Estrogens

Theoretically, licorice might increase or decrease the effects of estrogen therapy.
Theoretically, licorice might interfere with estrogen therapy due to estrogenic and anti-estrogenic effects.

Likelihood Possible Evidence D
Loop Diuretics

Theoretically, loop diuretics might increase the mineralocorticoid effects of licorice.
Theoretically, loop diuretics might enhance the mineralocorticoid effects of licorice by inhibiting the enzyme that converts cortisol to cortisone; however, bumetanide (Bumex) does not appear to have this effect.

Likelihood Possible Evidence D
Midazolam (Versed)

Theoretically, licorice might decrease levels of midazolam.
In humans, the licorice constituent glycyrrhizin appears to moderately induce the metabolism of midazolam. This is likely due to induction of cytochrome P450 3A4 by licorice. Until more is known, licorice should be used cautiously in people taking midazolam.

Likelihood Possible Evidence B
P-Glycoprotein Substrates

Theoretically, licorice might decrease the absorption of P-glycoprotein substrates.
In vitro research shows that licorice can increase P-glycoprotein activity.

Likelihood Possible Evidence D
Paclitaxel (Abraxane, Onxol)

Theoretically, licorice might decrease plasma levels and clinical effects of paclitaxel.
Multiple doses of licorice taken concomitantly with paclitaxel might reduce the effectiveness of paclitaxel. Animal research shows that licorice 3 grams/kg given orally for 14 days before intravenous administration of paclitaxel decreases the exposure to paclitaxel and increases its clearance. Theoretically, this occurs because licorice induces cytochrome P450 3A4 enzymes, which metabolize paclitaxel. Notably, a single dose of licorice did not affect exposure or clearance of paclitaxel.

Likelihood Possible Evidence D
Warfarin (Coumadin)

Theoretically, licorice might decrease plasma levels and clinical effects of warfarin.
Licorice seems to increase metabolism and decrease levels of warfarin in animal models. This is likely due to induction of cytochrome P450 2C9 (CYP2C9) metabolism by licorice. Advise patients taking warfarin to avoid taking licorice.

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

Theoretically, licorice might decrease the levels and clinical effects of CYP1A2 substrates.
In vitro research shows that licorice induces CYP1A2 enzymes.

Likelihood Possible Evidence D
Methotrexate (Trexall, Others)

Theoretically, licorice might increase levels of methotrexate.
Animal research suggests that intravenous administration of glycyrrhizin, a licorice constituent, and high-dose methotrexate may delay methotrexate excretion and increase systemic exposure, leading to transient elevations in liver enzymes and total bilirubin. This interaction has not yet been reported in humans.

Likelihood Unlikely Evidence D
Licorice, Powder full monograph & interactions

Oolong Tea37 drug types · 652 drugs

Ephedrine

Theoretically, concomitant use might increase the risk for stimulant adverse effects.
Oolong tea contains caffeine. There is evidence that using ephedrine with caffeine might increase the risk of serious life-threatening or debilitating adverse effects such as hypertension, myocardial infarction, stroke, seizures, and death. Tell patients to avoid taking caffeine with ephedrine and other stimulants.

Likelihood Probable Evidence D
Adenosine (Adenocard)

Theoretically, oolong tea might decrease the vasodilatory effects of adenosine and interfere with its use prior to stress testing.
Oolong tea contains caffeine. Caffeine is a competitive inhibitor of adenosine at the cellular level. However, caffeine does not seem to affect supplemental adenosine because high interstitial levels of adenosine overcome the antagonistic effects of caffeine. It is recommended that methylxanthines such as caffeine, as well as methylxanthine-containing products, be stopped 24 hours prior to pharmacological stress tests. However, methylxanthines appear more likely to interfere with dipyridamole (Persantine) than adenosine-induced stress testing.

Likelihood Possible Evidence B
Anticoagulant/Antiplatelet Drugs

Theoretically, oolong tea might increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Oolong tea contains caffeine. Caffeine is reported to have antiplatelet activity. Theoretically, the caffeine in oolong tea might increase the risk of bleeding when used concomitantly with these agents. However, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Beta-Adrenergic Agonists

Theoretically, large amounts of oolong tea might increase the cardiac inotropic effects of beta-agonists.
Oolong tea contains caffeine. Caffeine can increase cardiac inotropic effects of beta-agonists.

Likelihood Probable Evidence D
Cimetidine (Tagamet)

Theoretically, concomitant use might increase the effects and adverse effects of caffeine in oolong tea.
Oolong tea contains caffeine. Cimetidine can reduce the rate of caffeine clearance by 30% to 50%.

Likelihood Likely Evidence B
Clozapine (Clozaril)

Theoretically, oolong tea might increase the levels and adverse effects of clozapine and acutely exacerbate psychotic symptoms.
Oolong tea contains caffeine. Caffeine can increase the effects and toxicity of clozapine. Caffeine doses of 400-1000 mg per day inhibit clozapine metabolism. Clozapine is metabolized by cytochrome P450 1A2 (CYP1A2). Researchers speculate that caffeine might inhibit CYP1A2. However, there is no reliable evidence that caffeine affects CYP1A2. There is also speculation that genetic factors might make some patients be more sensitive to the interaction between clozapine and caffeine.

Likelihood Possible Evidence B
Cytochrome P450 1A2 (Cyp1A2) Inhibitors

Theoretically, concomitant use might increase the levels and adverse effects of the caffeine in oolong tea.
Oolong tea contains caffeine. Caffeine is metabolized by cytochrome P450 1A2 (CYP1A2),. Theoretically, drugs that inhibit CYP1A2 may decrease the clearance rate of caffeine from oolong tea and increase caffeine levels.

Likelihood Possible Evidence D
Dipyridamole (Persantine)

Theoretically, oolong tea might decrease the vasodilatory effects of dipyridamole and interfere with its use prior to stress testing.
Oolong tea contains caffeine. Caffeine is a methylxanthine that may inhibit dipyridamole-induced vasodilation. It is recommended that methylxanthines such as caffeine, as well as methylxanthine-containing products such as oolong tea, be stopped 24 hours prior to pharmacological stress tests. Methylxanthines appear more likely to interfere with dipyridamole than adenosine-induced stress testing.

Likelihood Probable Evidence B
Disulfiram (Antabuse)

Theoretically, disulfiram might increase the risk of adverse effects from caffeine in oolong tea.
Oolong tea contains caffeine. Disulfiram decreases the clearance and increases the half-life of caffeine.

Likelihood Probable Evidence D
Diuretic Drugs

Theoretically, using oolong tea with diuretic drugs might increase the risk of hypokalemia.
Oolong tea contains caffeine. In excessive amounts, caffeine can reduce potassium levels due to stimulation of the sodium-potassium pump. Diuretics can also cause lower potassium levels.

Likelihood Possible Evidence D
Estrogens

Theoretically, estrogens might increase the levels and adverse effects of caffeine in oolong tea.
Oolong tea contains caffeine. Estrogen inhibits caffeine metabolism.

Likelihood Probable Evidence B
Flutamide (Eulexin)

Theoretically, oolong tea might increase the levels and adverse effects of flutamide.
Oolong tea contains caffeine. In vitro evidence suggests that caffeine can inhibit the metabolism of flutamide.

Likelihood Possible Evidence D
Fluvoxamine (Luvox)

Theoretically, fluvoxamine might increase the levels and adverse effects of caffeine in oolong tea.
Oolong tea contains caffeine. Fluvoxamine reduces caffeine metabolism.

Likelihood Probable Evidence D
Lithium

Theoretically, abrupt oolong tea withdrawal might increase the levels and adverse effects of lithium.
Oolong tea contains caffeine. Abrupt caffeine withdrawal can increase serum lithium levels, worsening lithium tremor.

Likelihood Probable Evidence D
Monoamine Oxidase Inhibitors (Maois)

Theoretically, concomitant use might increase the risk of a hypertensive crisis.
Oolong tea contains caffeine. Caffeine has been shown to inhibit MAO A and B in laboratory studies. Concomitant intake of large amounts of caffeine with MAOIs might precipitate a hypertensive crisis.

Likelihood Possible Evidence D
Nicotine

Theoretically, concomitant use might increase the risk of hypertension.
Oolong tea contains caffeine. Concomitant use of caffeine and nicotine has been shown to have additive cardiovascular effects, including increased heart rate and blood pressure. Blood pressure was increased by 10.8/12.4 mmHg when the agents were used concomitantly.

Likelihood Probable Evidence D
Pentobarbital (Nembutal)

Theoretically, caffeine in oolong tea might decrease the effects of pentobarbital.
Oolong tea contains caffeine. The caffeine in oolong tea might negate the hypnotic effects of pentobarbital.

Likelihood Possible Evidence B
Phenobarbital (Luminal)

Theoretically, oolong tea might reduce the effects of phenobarbital and increase the risk for convulsions.
Oolong tea contains caffeine. Animal research suggests that caffeine can decrease the anticonvulsant activity of phenobarbital. The exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D
Phenylpropanolamine

Theoretically, phenylpropanolamine might increase the risk of hypertension, as well as the levels and adverse effects of caffeine in oolong tea.
Oolong tea contains caffeine. Concomitant use of phenylpropanolamine and caffeine might cause an additive increase in blood pressure. Phenylpropanolamine also seems to increase caffeine serum levels.

Likelihood Probable Evidence B
Phenytoin (Dilantin)

Theoretically, oolong tea might reduce the effects of phenytoin and increase the risk for convulsions.
Oolong tea contains caffeine. Animal research suggests that caffeine can decrease the anticonvulsant activity of phenytoin. The effect does not seem to be related to the seizure threshold-lowering effects of caffeine. However, the exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D
Pioglitazone (Actos)

Theoretically, oolong tea might increase the levels and clinical effects of pioglitazone.
Oolong tea contains caffeine. Animal research suggests that caffeine can modestly increase the maximum concentration, area under the curve, and half-life of pioglitazone, and also reduce its clearance. This increased the antidiabetic effects of pioglitazone. However, the exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D
Riluzole (Rilutek)

Theoretically, concomitant use might increase the levels and adverse effects of both caffeine and riluzole.
Oolong tea contains caffeine. Caffeine and riluzole are both metabolized by cytochrome P450 1A2 (CYP1A2), and concomitant use might reduce metabolism of one or both agents.

Likelihood Possible Evidence D
Stimulant Drugs

Theoretically, concomitant use might increase stimulant adverse effects.
Oolong tea contains caffeine. Due to the CNS stimulant effects of the caffeine constituent of oolong tea, concomitant use with stimulant drugs can increase the risk of adverse effects.

Likelihood Probable Evidence C
Theophylline

Theoretically, oolong tea might increase the levels and adverse effects of theophylline.
Oolong tea contains caffeine. Caffeine decreases theophylline clearance 23% to 29%.

Likelihood Probable Evidence D
Valproate

Theoretically, oolong tea might reduce the effects of valproate and increase the risk for convulsions.
Oolong tea contains caffeine. Animal research suggests that caffeine can decrease the anticonvulsant activity of valproate. However, the exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D
Oolong Tea full monograph & all 37 interactions

American Ginseng, Powder4 drug types · 217 drugs

Warfarin (Coumadin)

American ginseng seems to decrease the effectiveness of warfarin therapy.
Healthy patients receiving warfarin 5 mg daily, who also take American ginseng 1 gram twice daily, seem to have a significantly reduced international normalized ratio (INR).

Likelihood Likely Evidence B
Antidiabetes Drugs

Theoretically, taking American ginseng with antidiabetes drugs might increase the risk of hypoglycemia.
American ginseng seems to lower postprandial blood glucose. Theoretically, concomitant use with antidiabetes drugs might enhance blood glucose lowering effects and possibly cause hypoglycemia.

Likelihood Probable Evidence B
Immunosuppressants

Theoretically, American ginseng use might interfere with immunosuppressive therapy.
American ginseng seems to stimulate immune function. Theoretically, American ginseng might decrease the effectiveness of immunosuppressant drugs.

Likelihood Possible Evidence D
Monoamine Oxidase Inhibitors (Maois)

Theoretically, American ginseng can interfere with MAOI therapy.
There is one case report of insomnia, headache, and tremors when an unspecified ginseng product was used with phenelzine (Nardil), an MAOI. There is also one case report of hypomania when an unspecified ginseng product was used with phenelzine. Theoretically, American ginseng may interfere with MAOI therapy.

Likelihood Possible Evidence D
American Ginseng, Powder full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Lan Gui Ren Oolong Tea, from the product label.

Raw Forest Foods

See all Raw Forest Foods products
Name
RAW Forest Foods
Street Address
PO Box 102
City
Burlington
State
VT
ZipCode
05402
Phone Number
802-349-1347
Web Address
www.rawforestfoods.com
Pharmacist Counseling Corner

Lan Gui Ren Oolong Tea by Raw Forest Foods: Common Questions

Does Lan Gui Ren Oolong Tea by Raw Forest Foods interact with any medications?
Yes. Based on its ingredients, Lan Gui Ren Oolong Tea has a known interaction with 1,386 medications, including 10 rated major. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Lan Gui Ren Oolong Tea contains 3 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 this safe to take during pregnancy?
No—the safety data advises against it. Oolong tea has cautions around caffeine in pregnancy, American ginseng is rated possibly unsafe, and licorice is rated unsafe. Talk with your doctor or pharmacist before using any of these ingredients while pregnant.
Can I drink this while breastfeeding?
The safety data advises against it. Caffeine from oolong tea passes into breast milk and can make your baby fussy. American ginseng and licorice lack enough safety information for breastfeeding and should be avoided. Check with your pharmacist about safer options.
What does oolong tea do in this product?
Oolong tea is included for mental alertness—it's the ingredient most likely to help you feel more alert and focused, thanks to its caffeine content. The product's evidence for other uses (like bone health or cancer risk) is insufficient.
What are the common side effects?
Most side effects come from oolong tea's caffeine and include insomnia, nervousness, restlessness, rapid heartbeat, and tremors, especially if you drink a lot. Licorice may cause headache, nausea, or vomiting. American ginseng has been linked to headache.
How much oolong tea caffeine is in each serving?
The product facts don't specify the amount of caffeine per serving, so you'd need to contact the manufacturer for that detail.
Is this product tested for quality?
The product facts don't include information about quality testing or third-party verification. Since American ginseng quality and dosing vary between products, you may want to ask the manufacturer about their quality standards.

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

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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.

Lan Gui Ren Oolong Tea label
Go deeper

The Full Monographs Behind Lan Gui Ren Oolong Tea’s Ingredients

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

Herb & supplement monograph

Oolong Tea

Interacts with 652 drugs

Oolong tea is a traditional partially oxidized tea made from the same plant as green and black tea, and it provides caffeine and plant antioxidants. As a beverage it is generally considered...

Read the full Oolong Tea monograph → Herb & supplement monograph

American Ginseng

Interacts with 217 drugs

American ginseng is an herbal root used as an 'adaptogen' to support energy, stress, immune function, and blood sugar. Some uses—such as reducing the chance or length of colds and modestly l...

Read the full American Ginseng monograph → Herb & supplement monograph

Licorice

Interacts with 1,040 drugs

Licorice root is a traditional remedy used for sore throats, coughs, and digestive complaints, but solid human evidence is limited for most uses. Regular licorice contains glycyrrhizin, whic...

Read the full Licorice monograph →
Sources

Sources & How We Checked

Lan Gui Ren Oolong Tea'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 216 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.

Oolong Tea 112 references
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See these in context on the Oolong Tea monograph →

American Ginseng 12 references
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See these in context on the American Ginseng monograph →

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See these in context on the Licorice monograph →

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DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

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