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Dietary supplement

L-Citrulline 1000 mg Ingredients & Drug Interactions

by The Vitamin Shoppe

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

L-Citrulline 1000 mg is a dietary supplement by The Vitamin Shoppe 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 L-Citrulline 1000 mg by The Vitamin Shoppe

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.

This product contains one active ingredient: L-Citrulline at 1,000 mg per capsule. L-Citrulline is an amino acid that your body converts to L-arginine, which plays a role in blood vessel function and blood flow.

The capsule also contains several inactive ingredients—vegetable cellulose, microcrystalline cellulose, acacia, and magnesium stearate—which are fillers and binders used to form and stabilize the capsule.

Does it work?

Insufficient 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
Insufficient

There isn't enough reliable clinical evidence to rate this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: Nitric oxide and cardiovascular support.
  • We looked for evidence on: Cardiovascular disease (CVD), Erectile dysfunction (ED), Heart failure, Pulmonary hypertension, blood flow, endothelial function — and 1 related terms.
  • The closest evidence on file: L-citrulline is rated "Insufficient Reliable Evidence To Rate" for Cardiovascular disease (CVD) (Natural Medicines).
  • Also on file: L-citrulline is rated "Insufficient Reliable Evidence To Rate" for Heart failure, Erectile dysfunction (ED), Postoperative pulmonary hypertension, Pulmonary hypertension.

L-Citrulline is possibly effective for athletic performance, suggesting some evidence it may help with exercise capacity or endurance. For sarcopenia (age-related muscle loss), the evidence rates as possibly ineffective.

For cardiovascular disease, heart failure, Reye syndrome, and diabetes, there isn't enough reliable evidence in our data to establish whether it works. If you're considering it for one of these conditions, talk with your doctor about whether the current evidence supports its use for your situation.

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—gastrointestinal discomfort, heartburn, and stomach discomfort.

A small number of trial participants with pulmonary hypertension reported cough. There isn't enough safety data to recommend L-Citrulline during pregnancy or while breastfeeding; talk with your doctor or pharmacist if you're pregnant or nursing and considering this supplement.

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 L-Citrulline, check with your doctor or pharmacist if you take blood pressure medications or PDE-5 inhibitors (such as sildenafil). Both drug types can have additive blood vessel–relaxing effects with L-Citrulline, raising the risk of low blood pressure.

Check your own medication Run your meds through the checker above

The bottom line

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

L-Citrulline may be worth considering if you're interested in athletic performance support, but check with your doctor first if you take blood pressure medications or erectile dysfunction drugs—the combination could lower your blood pressure too much. If you're pregnant, nursing, or have heart or lung conditions, discuss it with your healthcare provider before starting.

Long-term safety data is limited, so this is one to review with your own doctor or pharmacist.

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 Feb 25, 2019.

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 L-Citrulline 1000 mg, straight from the product label.

Brand The Vitamin Shoppe
Barcode (UPC) 766536029082
Net contents 120 Veggie Capsule(s)
Market status On market
Date entered into DSLD Feb 25, 2019
DSLD ID 183622
Product type Amino Acid/protein
Supplement form Capsule
Dietary claims / uses Nutrient, All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Gluten Free, Dairy Free, Sugar 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 L-Citrulline 1000 mg by The Vitamin Shoppe, 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:
2 Veggie Capsule(s)
Maximum serving Sizes:
2 Veggie Capsule(s)
Servings per container
60
UPC/BARCODE
766536029082
IngredientAmount% DV
L-Citrulline1000 mg--

Other ingredients: Vegetable Cellulose, Microcrystalline Cellulose, Acacia, Magnesium Stearate

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.
Formula

L-Citrulline 1000mg per 2 veggie capsules

General Statements

Specialty

Nitric oxide Cardiovascular Free-form

Visit www.vitaminshoppe.com or call 1-800-223-1216 for more information and to reorder. Learn more at vsquality.net

FDA Statement of Identity

Dietary Supplement

Formulation

Gluten free Dairy free Soy free Nut free Does not contain: Gluten, Sugar, Salt, Preservatives, Artificial Colors or Flavors.

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.

Suggested/Recommended/Usage/Directions

Directions: Take two (2) veggie capsules daily, preferably in between meals.

Precautions

Warning: Consult your healthcare provider prior to use if you are pregnant, nursing, taking any medication or have any medical conditions.

Keep out of reach of children.

Tamper evident Do not use if outer seal is broken or missing.

Storage

Store in a cool, dry place.

General

Item No. VS-2908 2014991 HS 37

See for yourself

L-Citrulline 1000 mg by The Vitamin Shoppe label

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

What’s inside

The Ingredients in L-Citrulline 1000 mg by The Vitamin Shoppe

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

Serving size2 Veggie Capsule(s) Dosage formCapsule Servings per container60 Amounts shown are per serving.

L-Citrulline

Interacts with
178 drugs
1000 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: Vegetable Cellulose, Microcrystalline Cellulose, Acacia, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.

Interaction report

L-Citrulline 1000 mg by The Vitamin Shoppe Drug Interactions

Want to check YOUR meds against L-Citrulline 1000 mg?

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 L-Citrulline 1000 mg 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 L-Citrulline 1000 mg, from the product label.

The Vitamin Shoppe

See all The Vitamin Shoppe products
Name
Vitamin Shoppe, Inc.
City
Secaucus
State
NJ
ZipCode
07094
Phone Number
1-800-223-1216
Web Address
www.vitaminshoppe.com
Pharmacist Counseling Corner

L-Citrulline 1000 mg by The Vitamin Shoppe: Common Questions

Does L-Citrulline 1000 mg by The Vitamin Shoppe interact with any medications?
Yes. Based on its ingredients, L-Citrulline 1000 mg 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?
L-Citrulline 1000 mg 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.
What does L-Citrulline do in the body?
L-Citrulline is an amino acid your body converts to L-arginine. L-Arginine increases nitric oxide, which helps relax blood vessels and improve blood flow. That's why it's studied for athletic performance and cardiovascular health.
Can I take L-Citrulline if I'm pregnant or breastfeeding?
There isn't enough safety data for either pregnancy or breastfeeding. The facts advise against supplemental use during both. Talk with your doctor or pharmacist for personalized advice if you're pregnant or nursing.
Does L-Citrulline actually improve athletic performance?
The evidence rates as possibly effective for athletic performance, meaning some studies suggest it may help, but more research is needed to be certain. Results can vary from person to person.
What side effects might I experience?
The most common side effects are gastrointestinal—heartburn, stomach discomfort, and general GI upset. These are usually mild. A small number of people, especially those with lung disease, have reported cough.
Is this supplement studied for heart disease?
L-Citrulline is studied for both cardiovascular disease and heart failure, but there isn't enough reliable evidence yet to say whether it works for either condition. Talk with your cardiologist if you're considering it for heart health.

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

Not sure if L-Citrulline 1000 mg is safe with your meds?

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Ask a pharmacist

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.

L-Citrulline 1000 mg label
Sources

Sources & How We Checked

L-Citrulline 1000 mg'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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