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Dietary supplement

Citrulline Unflavored Ingredients & Drug Interactions

by Axe & Sledge Supplements

Powder Category: Amino Acid/protein
Most serious interaction: Moderate
The interaction bottom line Most serious interaction: Moderate

Citrulline Unflavored is a dietary supplement by Axe & Sledge Supplements with 1 active ingredient. Its ingredients are commonly taken for exercise performance, muscle soreness and fatigue, blood flow and circulation.Based on those ingredients, 178 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are L-Citrulline. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

HelloPharmacist Scorecard of Citrulline Unflavored by Axe & Sledge Supplements

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

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 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

Axe & Sledge Citrulline Unflavored contains one active ingredient: L-citrulline, an amino acid your body converts to another amino acid called L-arginine, which helps relax blood vessels and improve blood flow. There are no inactive ingredients listed.

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: boost blood flow and muscle endurance.
  • We looked for evidence on: Athletic performance, Muscle strength, Erectile dysfunction (ED), exercise capacity, vasodilation, circulation.
  • The strongest evidence on file: L-citrulline is rated "Possibly Effective" for Athletic performance (Natural Medicines).
  • Also on file: L-citrulline is rated "Insufficient Reliable Evidence To Rate" for Erectile dysfunction (ED), Muscle strength.

L-citrulline is possibly effective for athletic performance—some evidence suggests it may help with endurance and muscle function during exercise. For other uses in the product facts—sarcopenia (age-related muscle loss), cardiovascular disease, heart failure, and diabetes—the evidence is either insufficient to rate or suggests it's possibly ineffective.

The data we hold doesn't establish whether it works for those purposes.

The evidence, ingredient by ingredient L-citrulline

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 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • 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.

A small number of people taking the powder form reported cough. Because there isn't enough safety data, the facts advise against use during pregnancy and breastfeeding—talk with your doctor or pharmacist about whether this product is right for you if you're pregnant or nursing.

Side effects, ingredient by ingredient L-citrulline

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?
  • 1 of the 1 matched ingredient can interact with medications — L-citrulline.
  • The most serious interaction on file is rated Moderate.
  • For scale: 178 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 doctor or pharmacist if you're on blood pressure medications (antihypertensive drugs)—L-citrulline could lower your blood pressure further. Also confirm it's safe if you take erectile dysfunction drugs like sildenafil or tadalafil, since both increase vasodilation and the combination could cause a significant drop in blood pressure.

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.

This product might appeal to athletes looking for a performance boost. If you take blood pressure medications or erectile dysfunction drugs, you'll need to clear it with your doctor or pharmacist first, since L-citrulline could intensify their effects.

Anyone with a history of stomach sensitivity should know that heartburn and digestive discomfort are the most common side effects. Check with your own healthcare provider before starting, especially if you're on any prescription medications.

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

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Sep 24, 2021.

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 Citrulline Unflavored, straight from the product label.

Brand Axe & Sledge Supplements
Barcode (UPC) 750258225952
Net contents 200 Gram(s); 7.05 Oz(s)
Market status On market
Date entered into DSLD Sep 24, 2021
DSLD ID 254862
Product type Amino Acid/protein
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Women (not pregnant or lactating)
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 Citrulline Unflavored by Axe & Sledge Supplements, 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
40
UPC/BARCODE
750258225952
IngredientAmount% DV
L-Citrulline5000 mg--

Other ingredients: None

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

Suggested use As a dietary supplement, mix 5 grams with 6 to 8 oz. of water or your favorite beverage prior to your workout. For optimal results, take an additional serving post workout.

General Statements

For the hardest workers in the gym

Axe and Sledge basics

Precautions

Warning: Consult with a physician prior to use if you have a medical condition.

Don't use if pregnant or lactating.

Keep out of reach of children.

Storage

Keep container tightly closed in a cool, dry and dark 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.

Formulation

Boosts blood flow to muscle Supports endurance Supports vasodilation

Contains no fillers, excipients or artificial substances.

FDA Statement of Identity

Dietary Supplement

See for yourself

Citrulline Unflavored by Axe & Sledge Supplements label

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

What’s inside

The Ingredients in Citrulline Unflavored by Axe & Sledge Supplements

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size5 Gram(s) Dosage formPowder Servings per container40 Amounts shown are per serving.

L-Citrulline

Interacts with
178 drugs
5000 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

Other (inactive) ingredients: None. These complete the product’s ingredient list but are not active constituents.

Interaction report

Citrulline Unflavored by Axe & Sledge Supplements Drug Interactions

Want to check YOUR meds against Citrulline Unflavored?

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
178Drugs
178 Moderate

Ingredients driving the most interactions

Each ingredient & the kinds of drugs it affects

For each ingredient in Citrulline Unflavored with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

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
The maker

Brand information

Manufacturer and brand details for Citrulline Unflavored, from the product label.

Axe & Sledge Supplements

See all Axe & Sledge Supplements products
Name
Axe & Sledge Supplements
Street Address
1909 New Texas Road
City
Pittsburgh
State
PA
ZipCode
15239
Phone Number
(888) 944-6612
Web Address
www.axeandsledge.com
Pharmacist Counseling Corner

Citrulline Unflavored by Axe & Sledge Supplements: Common Questions

Does Citrulline Unflavored by Axe & Sledge Supplements interact with any medications?
Yes. Based on its ingredients, Citrulline Unflavored has a known interaction with 178 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Citrulline Unflavored contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism 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.
Will this product give me better athletic performance?
L-citrulline is possibly effective for athletic performance according to our data, meaning some evidence supports it may help with endurance and muscle function during exercise. Results vary, and it's not guaranteed to work for you.
What are the main side effects?
The most common side effects are gastrointestinal discomfort, heartburn, and stomach upset. A small number of people have reported cough when taking the powder form. Most people tolerate it well.
Can I take this while pregnant or breastfeeding?
There isn't enough safety data, so the facts advise against use during pregnancy and breastfeeding. Talk with your doctor or pharmacist about whether this product is right for your situation.
What does L-citrulline do in my body?
Your body converts L-citrulline into L-arginine, which helps increase nitric oxide and relax blood vessels. This improves blood flow throughout your body, which is why it's used for athletic performance and cardiovascular support.
Is this the same as L-arginine?
No—L-citrulline and L-arginine are different amino acids. Your body converts L-citrulline to L-arginine, but taking L-citrulline directly may be more effective because it's absorbed differently in your digestive system.

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

Not sure if Citrulline Unflavored 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.

Citrulline Unflavored label
Sources

Sources & How We Checked

Citrulline Unflavored'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 8 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-citrulline 8 references
  1. Cheng JW, Balwin SN. L-arginine in the management of cardiovascular diseases. Ann Pharmacother 2001;35:755-64. PubMed
  2. Schwedhelm E, Maas R, Freese R, et al. Pharmacokinetic and pharmacodynamic properties of oral L-citrulline and L-arginine: impact on nitric oxide metabolism. Br J Clin Pharmacol 2008;65:51-9. PubMed
  3. Romero MJ, Platt DH, Caldwell RB, Caldwell RW. Therapeutic use of citrulline in cardiovascular disease. Cardiovasc Drug Rev 2006;24:275-90. PubMed
  4. Balderas-Munoz K, Castillo-Martínez L, Orea-Tejeda A, et al. Improvement of ventricular function in systolic heart failure patients with oral L-citrulline supplementation. Cardiol J 2012;19:612-7. PubMed
  5. Sharif Kashani B, Tahmaseb Pour P, Malekmohammad M, et al. Oral l-citrulline malate in patients with idiopathic pulmonary arterial hypertension and Eisenmenger Syndrome: a clinical trial. J Cardiol 2014;64:231-5. PubMed
  6. Pérez-Guisado J, Jakeman PM. Citrulline malate enhances athletic anaerobic performance and relieves muscle soreness. J Strength Cond Res 2010;24:1215-22. PubMed
  7. Mirenayat MS, Moradi S, Mohammadi H, Rouhani MH. Effect of L-citrulline supplementation on blood pressure: a systematic review and meta-analysis of clinical trials. Curr Hypertens Rep. 2018;20(11):98. PubMed
  8. Xu Z, Liu C, Liu S, Zhou Z. Comparison of efficacy and safety of daily oral L-arginine and PDE5Is alone or combination in treating erectile dysfunction: A systematic review and meta-analysis of randomised controlled trials. Andrologia. 2021:e14007. PubMed

See these in context on the L-citrulline monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

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.

© 2021 Therapeutic Research Center, LLC

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