Interactions on record — worth a quick check against your medications. Check your meds →
Dietary supplement

N.O. XT Ingredients & Drug Interactions

by Jacked Factory

N.O. XT label
See full label image
Capsule Category: Other Combinations
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking N.O. XT 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: Moderate

N.O. XT is a dietary supplement by Jacked Factory with 4 active ingredients. Its ingredients are commonly taken for high blood pressure, erectile dysfunction, athletic performance.Based on those ingredients, 1,156 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are BioPerine, L-Arginine, L-Citrulline. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against N.O. XT by Jacked Factory

Ask about any prescription or over-the-counter medication and we check it for interactions with N.O. XT by Jacked Factory — and tell you which ingredient is responsible.

Pharmacist-reviewed data Checks every ingredient Answer in seconds
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HelloPharmacist Scorecard of N.O. XT by Jacked Factory

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 4 of its 4 active ingredients.
  • “L-Arginine” is listed as a grouped ingredient — the label gives one combined amount (66.70 mg) without saying how much of each component you get.

N.O. XT contains four active ingredients.

L-Arginine and L-Citrulline are amino acids that your body uses to boost nitric oxide, a molecule that helps blood vessels relax and widen. Nitrosigine is another compound believed to support blood flow.

L-Glutathione is an antioxidant your cells naturally make. The product also contains two inactive ingredients — Hypromellose and L-Leucine — which serve as capsule material and filler.

Does it work?

Moderate 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
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: Nitric oxide production and vasodilation support.
  • We looked for evidence on: Athletic performance, Cardiovascular disease (CVD), Erectile dysfunction (ED), Heart failure, Muscle strength, Pulmonary hypertension — and 3 related terms.
  • The strongest evidence on file: L-citrulline is rated "Possibly Effective" for Athletic performance (Natural Medicines).
  • Also on file: Glutathione is rated "Insufficient Reliable Evidence To Rate" for Athletic performance, Cardiovascular disease (CVD).
  • Also on file: Black Pepper is rated "Insufficient Reliable Evidence To Rate" for Athletic performance.

L-Citrulline is possibly effective for athletic performance, but the evidence for its use in cardiovascular disease, heart failure, diabetes, and other conditions is insufficient to rate. L-Glutathione is possibly effective for reducing nerve damage from the chemotherapy drug cisplatin, but evidence is insufficient for athletic performance, Alzheimer disease, fatty liver disease, and cataracts.

BioPerine's effectiveness for athletic performance, asthma, hay fever, headache, depression, and diarrhea lacks reliable evidence. Nitrosigine's effectiveness is not established in the data we hold.

The evidence, ingredient by ingredient L-arginine L-citrulline Glutathione Black Pepper

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.

L-Citrulline is generally well tolerated in healthy adults, though long-term safety hasn't been fully studied. The most common side effects are gastrointestinal — discomfort, heartburn, and stomach upset.

Avoid L-Citrulline during pregnancy and breastfeeding; there isn't enough safety data. L-Glutathione appears generally well tolerated by mouth in the short term, but long-term safety is unclear.

Avoid it during pregnancy and breastfeeding unless your doctor advises otherwise. BioPerine from black pepper is generally safe in food amounts, though concentrated supplements warrant caution.

Reported side effects are mild — burning aftertaste, indigestion, and reduced taste perception — and allergic reactions are rare.

Side effects, ingredient by ingredient L-arginine L-citrulline Glutathione Black Pepper

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 2 of the 3 matched ingredients can interact with medications — Black Pepper, L-citrulline.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; immunosuppressants / transplant drugs; diabetes medications; lithium.
  • For scale: 1,143 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 before starting if you take blood pressure medications or erectile dysfunction drugs — L-Citrulline may lower blood pressure further. Also flag any use of propranolol, phenytoin, theophylline, atorvastatin, rifampin, nevirapine, cyclosporine, or pentobarbital — BioPerine can increase their blood levels.

If you take any prescription medication, search it on this page before you begin.

Check your own medication Run your meds through the checker above

The bottom line

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

If you're an athlete looking to support blood flow and performance, N.O. XT has ingredients with some evidence behind them.

But if you take blood pressure medications, erectile dysfunction drugs, or any of the specific medications BioPerine interacts with — propranolol, phenytoin, theophylline, atorvastatin, and others — you must check with us or your pharmacist first. Pregnant or breastfeeding?

Skip the L-Citrulline and L-Glutathione until you've talked with your doctor.

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

Assessment coverage: 3 of 4 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Oct 24, 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 N.O. XT, straight from the product label.

Brand Jacked Factory
Barcode (UPC) 672691004522
Net contents 90 Veggie Capsule(s)
Market status On market
Date entered into DSLD Oct 24, 2024
DSLD ID 319463
Product type Other Combinations
Supplement form Capsule
Dietary claims / uses Nutrient, 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 N.O. XT by Jacked Factory, 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:
3 Capsule(s)
Maximum serving Sizes:
3 Capsule(s)
Servings per container
30
UPC/BARCODE
672691004522
IngredientAmount% DV
L-Arginine66.7 mg--
L-Citrulline500 mg--
Nitrosigine166.7 mg--
L-Glutathione66.7 mg--
BioPerine1.7 mg--

Other ingredients: Hypromellose, L-Leucine

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.
Suggested/Recommended/Usage/Directions

Recommended use: A source of substrates for nitric oxide production, a vasodilator. Directions: Adult(s) (18 years and over) 3 capsules, 2 times per day. Ensure to drink optimal fluid before, during and after exercise. Duration of use: Consult a healthcare practitioner for use beyond 2 weeks.

Precautions

Warnings: Consult a health care practitioner prior to use if you are pregnant or breastfeeding, or if you suffer from cardiovascular disease and are attempting an increase in physical activity or if your cardiovascular condition worsens. Consult a health care practitioner prior to use if you are taking any other medications or natural health products, as black pepper/piperine may alter their effectiveness , or if you are taking medication for cardiovascular diseases, erectile dysfunction, and/or blood thinners.

Duration of use: Consult a healthcare practitioner for use beyond 2 weeks. Contra-indications: Do not use if you have had a heart attack/myocardial infraction. Known adverse reactions: some people may experience gastrointestinal discomfort/disturbances. Do not use if seal is broken. Security feature is self evident

Allergen warning: This product is manufactured in a facility which may also process milk, soy, wheat, egg, peanuts, tree nuts, fish and shellfish.

Formula

1500 mg L-citrulline 500 mg Nitrosigine 200 mg Glutathione Per serving

Formulation

Supports production of nitric oxide

FDA Statement of Identity

Natural health product

General Statements

NPN 80125263

Please recycle container Get connected Facebook @Jackedfactory Instagram @Jackedfactory Jackedfactory.com

Brand IP Statement(s)

BioPerine is a licensed registered trademark material of Sabinsa. Nitrosigine Bonded Arginine SIlicate Nitrosigine, including the Nitrosigine logo, is a registered trademark of Nutrrition 21, LLC. Nitrosigine is patent protected.

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

See for yourself

N.O. XT by Jacked Factory label

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

N.O. XT 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 N.O. XT by Jacked Factory

These are the 4 active ingredients this product is made of. Select any to open its full monograph.

Serving size3 Capsule(s) Dosage formCapsule 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.

L-Arginine

Interacts with
403 drugs
66.7 mg per serving

L-arginine is an amino acid that the body uses to make nitric oxide, a substance that helps blood vessels relax and widen. It is popularly used for bl...

L-Arginine monograph & interactions
  • › Nitrosigine

L-Citrulline

Interacts with
178 drugs
500 mg per serving

L-citrulline is an amino acid that the body turns into L-arginine to help make nitric oxide, which relaxes blood vessels and may improve blood flow. I...

L-Citrulline monograph & interactions

L-Glutathione

No known
interactions
66.7 mg per serving Form: Glutathione

Glutathione is a powerful antioxidant your body makes naturally, and many people take it as a supplement hoping for skin, detox, or anti-aging benefit...

L-Glutathione monograph & interactions

BioPerine

Interacts with
1,019 drugs
1.7 mg per serving Form: Piperine

Black pepper is a common kitchen spice that is generally safe in the amounts used in food. Its extract, piperine, is mostly added to supplements to he...

BioPerine monograph & interactions

Other (inactive) ingredients: Hypromellose, L-Leucine. These complete the product’s ingredient list but are not active constituents.

Interaction report

N.O. XT by Jacked Factory Drug Interactions

Want to check YOUR meds against N.O. XT?

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
1,156Drugs
1,110 Moderate 46 Minor

Ingredients driving the most interactions

BioPerine 1,019
L-Arginine 403
L-Citrulline 178

Individual Drug Interactions

The ingredients in N.O. XT interact with 1,156 drugs. Click any drug to see the details.

3 of the 4 ingredients in N.O. XT interact with drugs. Each result below shows which ingredient is responsible. BioPerine L-Arginine L-Citrulline

Each ingredient & the kinds of drugs it affects

For each ingredient in N.O. XT 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.

BioPerine17 drug types · 1,019 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, black pepper might increase the risk of bleeding when taken with antiplatelet or anticoagulant drugs.
In vitro research shows that piperine, a constituent of black pepper, seems to inhibit platelet aggregation. This has not been reported in humans.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, black pepper might increase the risk of hypoglycemia when taken with antidiabetes drugs.
Animal research shows that piperine, a constituent of black pepper, can reduce blood glucose levels. Monitor blood glucose levels closely. Dose adjustments might be necessary.

Likelihood Possible Evidence D
Atorvastatin (Lipitor)

Theoretically, black pepper might increase blood levels of atorvastatin.
Animal research shows that taking piperine, a constituent of black pepper, 35 mg/kg can increase the maximum serum concentration of atorvastatin three-fold. This has not been reported in humans.

Likelihood Possible Evidence D
Cyclosporine (Neoral, Sandimmune)

Theoretically, black pepper might increase the effects and side effects of cyclosporine.
In vitro research shows that piperine, a constituent of black pepper, increases the bioavailability of cyclosporine. This has not been reported in humans.

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

Theoretically, black pepper might increase levels of drugs metabolized by CYP2D6.
In vitro research suggests that some constituents of black pepper inhibit CYP2D6. This has not been reported in humans.

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

Theoretically, black pepper might increase levels of drugs metabolized by CYP3A4.
In vitro research and pharmacokinetic simulation data suggest that piperine, a constituent of black pepper, as well as the pepper fruit seem to inhibit CYP3A4. This has not been reported in humans.

Likelihood Possible Evidence D
Lithium

Theoretically, black pepper might increase blood levels of lithium due to its diuretic effects. The dose of lithium might need to be reduced.
Black pepper is thought to have diuretic properties.

Likelihood Probable Evidence D
Nevirapine (Viramune)

Black pepper might increase blood levels of nevirapine.
Clinical research shows that piperine, a constituent of black pepper, increases the plasma concentration of nevirapine. However, no adverse effects were observed in this study.

Likelihood Probable Evidence D
P-Glycoprotein Substrates

Theoretically, black pepper might increase levels of P-glycoprotein substrates.
In vitro research shows that piperine, a constituent of black pepper, seems to inhibit P-glycoprotein.

Likelihood Possible Evidence D
Pentobarbital (Nembutal)

Theoretically, black pepper might increase the sedative effects of pentobarbital.
Animal research shows that piperine, a constituent of black pepper, increases pentobarbital-induced sleeping time.

Likelihood Possible Evidence D
Phenytoin (Dilantin)

Black pepper might increase blood levels of phenytoin.
Clinical research shows that piperine, a constituent of black pepper, seems to increase absorption, slow elimination, and increase levels of phenytoin. Taking a single dose of black pepper 1 gram along with phenytoin seems to double the serum concentration of phenytoin. Consuming a soup with black pepper providing piperine 44 mg/200 mL of soup along with phenytoin also seems to increase phenytoin levels when compared with consuming the same soup without black pepper.

Likelihood Possible Evidence B
Propranolol (Inderal)

Black pepper might increase blood levels of propranolol.
Clinical research shows that piperine, a constituent of black pepper, seems to increase absorption and slow elimination of propranolol.

Likelihood Possible Evidence B
Rifampin (Rifadin)

Black pepper might increase blood levels of rifampin.
Clinical research shows that piperine, a constituent of black pepper, seems to increase absorption and serum levels of rifampin.

Likelihood Possible Evidence B
Theophylline

Black pepper might increase blood levels of theophylline.
Clinical research shows that piperine, a constituent of black pepper, seems to increase absorption and slow elimination of theophylline.

Likelihood Possible Evidence D
Amoxicillin (Amoxil, Trimox)

Theoretically, black pepper might increase the effects and side effects of amoxicillin.
Animal research shows that taking piperine, a constituent of black pepper, with amoxicillin increases plasma levels of amoxicillin. This has not been reported in humans.

Likelihood Possible Evidence D
Carbamazepine (Tegretol)

Theoretically, black pepper might increase blood levels of carbamazepine, potentially increasing the effects and side effects of carbamazepine.
One clinical study in patients taking carbamazepine 300 mg or 500 mg twice daily shows that taking a single 20 mg dose of purified piperine, a constituent of black pepper, increases carbamazepine levels. Piperine may increase carbamazepine absorption by increasing blood flow to the GI tract, increasing the surface area of the small intestine, or inhibiting cytochrome P450 3A4 (CYP3A4) in the gut wall. Absorption was significantly increased by 7-10 mcg/mL/hour. The time to eliminate carbamazepine was also increased by 4-8 hours. Although carbamazepine levels were increased, this did not appear to increase side effects. In vitro research also shows that piperine can increase carbamazepine levels by 11% in a time-dependent manner.

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

Theoretically, black pepper might decrease levels and clinical effects of drugs metabolized by CYP1A2.
In vitro research suggests that black pepper induces CYP1A2. This has not been reported in humans.

Likelihood Possible Evidence D
BioPerine full monograph & interactions

L-Arginine9 drug types · 403 drugs

Ace Inhibitors (Aceis)

Theoretically, concomitant use of L-arginine and ACE inhibitors may increase the risk for hypotension and hyperkalemia.
Combining L-arginine with some antihypertensive drugs, especially ACE inhibitors, seems to have additive vasodilating and blood pressure-lowering effects. Furthermore, ACE inhibitors can increase potassium levels. Use of L-arginine has been associated with hyperkalemia in some patients. Theoretically, concomitant use of ACE inhibitors with L-arginine may increases the risk of hyperkalemia.

Likelihood Probable Evidence D
Angiotensin Receptor Blockers (Arbs)

Theoretically, concomitant use of L-arginine and ARBs may increase the risk of hypotension and hyperkalemia.
L-arginine increases nitric oxide, which causes vasodilation. Combining L-arginine with ARBs seems to increase L-arginine-induced vasodilation. Furthermore, ARBs can increase potassium levels. Use of L-arginine has been associated with hyperkalemia in some patients. Theoretically, concomitant use of ARBs with L-arginine may increases the risk of hyperkalemia.

Likelihood Probable Evidence D
Anticoagulant/Antiplatelet Drugs

Theoretically, concomitant use of L-arginine with anticoagulant and antiplatelet drugs might have additive effects and increase the risk of bleeding.
Preliminary research suggests that L-arginine infusions reduce platelet aggregation in humans. The clinical significance of this effect is unclear.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, concomitant use of L-arginine might have additive effects with antidiabetes drugs.
Preliminary clinical research shows that L-arginine decreases blood glucose levels in patients with type 2 diabetes.

Likelihood Possible Evidence D
Antihypertensive Drugs

Theoretically, concomitant use of L-arginine and antihypertensive drugs may increase the risk of hypotension.
L-arginine increases nitric oxide, which causes vasodilation. Clinical evidence shows that L-arginine can reduce blood pressure in some individuals with hypertension. Furthermore, combining L-arginine with some antihypertensive drugs seems to have additive vasodilating and blood pressure-lowering effects.

Likelihood Probable Evidence D
Isoproterenol (Isuprel)

Theoretically, concurrent use of isoproterenol and L-arginine might result in additive effects and hypotension.
Preliminary clinical evidence suggests that L-arginine enhances isoproterenol-induced vasodilation in patients with essential hypertension or a family history of essential hypertension.

Likelihood Probable Evidence D
Potassium-Sparing Diuretics

Theoretically concomitant use of potassium-sparing diuretics with L-arginine may increases the risk of hyperkalemia.
Potassium-sparing diuretics can increase potassium levels. Use of L-arginine has been associated with hyperkalemia in some patients.

Likelihood Possible Evidence D
Sildenafil (Viagra)

Theoretically, concurrent use of sildenafil and L-arginine might increase the risk for hypotension.
In vivo, concurrent use of L-arginine and sildenafil has resulted in increased vasodilation. Theoretically, concurrent use might have additive vasodilatory and hypotensive effects. However, in studies evaluating the combined use of L-arginine and sildenafil for erectile dysfunction, hypotension was not reported.

Likelihood Possible Evidence D
Testosterone

Theoretically, concomitant use of L-arginine and testosterone might have additive effects.
In clinical research, L-arginine increases the level of testosterone in male patients with erectile dysfunction. The clinical significance of this finding is unclear.

Likelihood Possible Evidence D
L-Arginine full monograph & interactions

L-Citrulline2 drug types · 178 drugs

Antihypertensive Drugs

Theoretically, concomitant use of L-citrulline with antihypertensive drugs might have additive effects and increase the chance of hypotension.
L-citrulline is converted to L-arginine, which can increase nitric oxide and cause vasodilation. However, a meta-analysis of 5 small clinical studies suggests that taking L-citrulline 3-6 grams daily for 1-8 weeks does not lower blood pressure when compared with control.

Likelihood Possible Evidence B
Phosphodiesterase-5 Inhibitors

Theoretically, concurrent use of phosphodiesterase-5 (PDE-5) inhibitors and L-citrulline might result in additive vasodilation.
L-citrulline is converted to L-arginine, which can increase nitric oxide and cause vasodilation. Theoretically, taking L-arginine with PDE-5 inhibitors might have additive vasodilatory and hypotensive effects. However, in studies evaluating the combined use of L-arginine and sildenafil for erectile dysfunction, hypotension was not reported.

Likelihood Possible Evidence D
L-Citrulline full monograph & interactions
The maker

Brand information

Manufacturer and brand details for N.O. XT, from the product label.

Jacked Factory

See all Jacked Factory products
Name
Jacked Factory
City
St. John's
ZipCode
A1A 5A1
Phone Number
1-877-250-5237
Web Address
Jackedfactory.com
Pharmacist Counseling Corner

N.O. XT by Jacked Factory: Common Questions

Does N.O. XT by Jacked Factory interact with any medications?
Yes. Based on its ingredients, N.O. XT has a known interaction with 1,156 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
N.O. XT contains 4 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.
Does this product work for building muscle or athletic performance?
L-Citrulline is possibly effective for athletic performance based on the data we have. L-Glutathione's effectiveness for athletic performance is insufficient to rate. The other ingredients' evidence for performance or muscle-building isn't established in our data.
What are the side effects I should expect?
L-Citrulline's most common side effects are gastrointestinal — heartburn, stomach discomfort, and digestive upset. BioPerine may cause a burning aftertaste, indigestion, or reduced taste perception. Allergic reactions to black pepper are rare but possible in sensitive people. Long-term safety of L-Citrulline and L-Glutathione hasn't been fully studied.
Is it safe to take while pregnant or breastfeeding?
No. L-Citrulline and L-Glutathione should be avoided during pregnancy and breastfeeding — there isn't enough reliable safety data. Talk with your doctor or pharmacist before taking this product if you're pregnant or nursing.
What is L-Citrulline and what does it do?
L-Citrulline is an amino acid your body converts into L-Arginine, which helps produce nitric oxide — a molecule that causes blood vessels to relax and widen. This can improve blood flow. It's possibly effective for athletic performance.
What is BioPerine and why is it in this product?
BioPerine is an extract of black pepper containing piperine. It's included because it may help your body absorb other ingredients better. On its own, its effectiveness for most conditions lacks reliable evidence.
Does this product have fillers or just the active ingredients?
It contains two inactive ingredients — Hypromellose, which forms the capsule, and L-Leucine as a filler. Beyond those, there are no other inactive ingredients listed.

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.

N.O. XT label
Go deeper

The Full Monographs Behind N.O. XT’s Ingredients

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

Herb & supplement monograph

L-arginine

Interacts with 403 drugs

L-arginine is an amino acid that the body uses to make nitric oxide, a substance that helps blood vessels relax and widen. It is popularly used for blood pressure, erectile dysfunction, and...

Read the full L-arginine monograph → Herb & supplement monograph

L-citrulline

Interacts with 178 drugs

L-citrulline is an amino acid that the body turns into L-arginine to help make nitric oxide, which relaxes blood vessels and may improve blood flow. It is popular for exercise performance an...

Read the full L-citrulline monograph → Herb & supplement monograph

Glutathione

Glutathione is a powerful antioxidant your body makes naturally, and many people take it as a supplement hoping for skin, detox, or anti-aging benefits. However, strong human evidence is lim...

Read the full Glutathione monograph → Herb & supplement monograph

Black Pepper

Interacts with 1,019 drugs

Black pepper is a common kitchen spice that is generally safe in the amounts used in food. Its extract, piperine, is mostly added to supplements to help the body absorb other ingredients (li...

Read the full Black Pepper monograph →
Sources

Sources & How We Checked

N.O. XT'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 104 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.

L-arginine 66 references
  1. Sapienza MA, Kharitonov SA, Horvath I, et al. Effect of inhaled L-arginine on exhaled nitric oxide in normal and asthmatic subjects. Thorax 1998;53:172-5.
  2. Clarkson P, Adams MR, Powe AJ, et al. Oral L-arginine improves endothelium-dependent dilation in hypercholesterolemic young adults. J Clin Invest 1996;97:1989-94. PubMed
  3. Tenenbaum A, Fisman EZ, Motro M. L-arginine: Rediscovery in progress. Cardiology 1998;90:153-9.
  4. Brittenden J, Park KGM, Heys SD, et al. L-Arginine stimulates host defenses in patients with breast cancer. Surgery 1994;115:205-12.
  5. Korting GE, Smith SD, Wheeler MA, et al. A randomized double-blind trial of oral L-arginine for treatment of interstitial cystitis. J Urol 1999;161:558-65. DOI
  6. Rector TS, Bank AJ, Mullen KA, et al. Randomized, double-blind, placebo-controlled study of supplemental oral L-arginine in patients with heart failure. Circulation 1996;93:2135-41.
  7. Siani A, Pagano E, Iacone R, et al. Blood pressure and metabolic changes during dietary L-arginine supplementation in humans. Am J Hypertens 2000;13:547-51. PubMed
  8. Cheng JW, Balwin SN. L-arginine in the management of cardiovascular diseases. Ann Pharmacother 2001;35:755-64. PubMed
  9. Wallace AW, Tom WL. Interaction of L-arginine and phosphodiesterase inhibitors in vasodilation of the porcine internal mammary artery. Anesth Analg 2000;90:840-6. DOI
  10. Huynh NT, Tayek JA. Oral arginine reduces systemic blood pressure in type 2 diabetes: its potential role in nitric oxide generation. J Am Coll Nutr 2002;21:422-7.. PubMed
  11. Staff AC, Berge L, Haugen G, et al. Dietary supplementation with L-arginine or placebo in women with pre-eclampsia. Acta Obstet Gynecol Scand 2004;83:103-7.
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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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