Best L-Arginine and L-Citrulline Supplements for Workouts
Learn how synergistic amino acid formulas enhance daily physical performance, increase exercise endurance, and protect circulatory health.
By WOWMD Staff
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Introduction
Both L-arginine and L-citrulline are familiar names on pre-workout supplement labels, but you don't need to be aiming for a big gym pump to be interested. Both amino acids are associated with nitric oxide production, which is important for normal blood flow and circulation.
The challenging aspect is the product selection. Some keep things simple with arginine and citrulline alone. Some include beetroot, niacin, beta-alanine, herbs or other components specifically for men's wellness.
We compared five popular options to see which formulas feel focused, practical, and worth considering for different needs.
TL;DR
- L-arginine and L-citrulline both support pathways involved in nitric oxide production.
- In the body, L-citrulline gets metabolized into arginine and may be especially effective in elevating levels of arginine in the body.
- These supplements are typically taken for blood flow, exercise stamina, and muscle pump.
- The quantities of the ingredients are more important than the length of the Supplement Facts panel.
- Gummies are easy to use, and capsules may provide a more straightforward formula.
- WOWMD L-Citrulline + L-Arginine Stack is our top overall recommendation due to its targeted formula of three amino acids and simple daily supplementation.
What Are L-Arginine and L-Citrulline Supplements?
L-arginine and L-citrulline are two amino acids that are linked by the nitric oxide pathway in the body.
L-arginine can be used directly to produce nitric oxide. L-citrulline takes a less direct route: the body converts it into arginine, which can then support nitric oxide production.
That connection is why the two ingredients are so commonly used together. Research in healthy adults has also found that oral citrulline can raise plasma arginine efficiently, despite not being arginine itself.
Most formulas target blood flow, circulation, exercise performance, stamina and/or muscle pumps, while others address a more comprehensive men's health regimen.
Top L-Arginine and L-Citrulline Supplements
The five products below are quite different once you get past the nitric-oxide language. Here’s where each one fits best.
Best Overall: WOWMD L-Citrulline + L-Arginine Stack
Best for Men’s Vitality: GaraHerb
Best for Male Reproductive Wellness: VB Health Load Boost
Best Transparent Capsule Formula: Arazo Nutrition Premium L-Arginine
Best Gummy: NEXTDIA L-Arginine Nitric Oxide Gummies
Pros
- Contains citrulline and two forms of arginine.
- Focused three-ingredient formula.https://www.wowmd.com/products/l-citrulline-l-arginine-stack
- Only two capsules daily.
- Stimulant-free.
- Vegan and non-GMO.
- 60-day guarantee.
Cons
- Results require consistency
- Available only through the official website
Form: Capsules | Dosage: 2 Daily | Key Ingredients: L-Citrulline DL-Malate, L-Arginine HCl, L-Arginine AKG | Refund Policy: 60 Days
Description:
WOWMD keeps this formula pleasantly simple. Instead of surrounding arginine and citrulline with a long list of extras, it combines L-Citrulline DL-Malate with L-Arginine Hydrochloride and L-Arginine Alpha-Ketoglutarate.
The idea is straightforward: support nitric oxide pathways, circulation, workout stamina, and recovery without adding caffeine or another stimulant blend. The product is also vegan, gluten-free, allergen-free, and non-GMO.
Things to Consider:
WOWMD is a fairly focused option, so it may suit people who specifically want an L-citrulline and L-arginine stack without caffeine or a long list of added performance ingredients. The two-capsule serving also keeps the routine simple, which can make consistent use easier.
For someone specifically searching for an L-arginine and L-citrulline supplement, though, this is the most focused all-rounder here.
Pros
- Simple once-daily serving.
- Contains L-citrulline.
- Made in the USA.
- 60-day satisfaction guarantee.
Cons
- Does not contain L-arginine.
- Uses a proprietary blend.
Form: Capsule | Dosage: 1 Daily | Key Ingredients: L-Citrulline, L-Carnitine, Maca, Pine Bark, Mucuna, Grape Skin Extract, Saffron | Refund Policy: 60 Days
Description:
GaraHerb is less of a traditional workout supplement and more of a men’s vitality formula.
Its label provides 20 mg of niacin and 11 mg of zinc, alongside a 570 mg proprietary blend containing L-citrulline, L-carnitine, pine bark, velvet bean, maca, grape skin extract, and saffron.
That gives it a broader focus on everyday energy, circulation, and male wellness rather than gym performance alone.
Things to Consider:
The biggest thing to notice is that GaraHerb does not contain L-arginine. It also doesn’t disclose how much L-citrulline is inside the proprietary blend.
It makes more sense for someone interested in a broader men’s formula than someone specifically looking for an arginine-citrulline stack.
Pros
- Contains both L-arginine and L-citrulline.
- Third-party tested.
- Made in the USA.
- Doctor-founded brand.
Cons
- Requires four capsules daily.
- Much more specialised than a standard nitric oxide supplement.
Form: Veggie Capsules | Dosage: 4 Daily | Key Ingredients: L-Arginine, L-Citrulline, Pygeum, Zinc, Lecithin, Bromelain, Copper | Refund Policy: 100 Days
Description:
Load Boost takes the arginine-citrulline combination in a completely different direction.
Rather than focusing mainly on workouts, VB Health combines the two amino acids with pygeum, zinc, lecithin, bromelain, and copper in a formula aimed at male reproductive and sexual wellness.
The brand states that its supplements are third-party tested and manufactured in the USA in facilities following GMP standards.
Things to Consider:
Four capsules a day is more than the other capsule products here, and the formula is quite specialised.
It makes the most sense for men who want broader reproductive-wellness ingredients rather than a simple nitric oxide supplement for workouts.
Pros
- Contains two forms of arginine.
- Contains two forms of citrulline.
- Third-party safety tested.
- Made in a GMP-certified US facility.
Cons
- Some amino-acid amounts are relatively modest.
- Lack of customer reviews
Form: Capsules | Dosage: 2 Daily | Key Ingredients: L-Arginine, Arginine AKG, L-Citrulline HCl, Citrulline Malate, Beta-Alanine | Refund Policy: N/A
Description:
Arazo Nutrition earns points for simply telling you what you’re getting.
A two-capsule serving provides 400 mg L-arginine, 400 mg L-arginine AKG, 200 mg L-citrulline HCl, 200 mg citrulline malate, and 80 mg beta-alanine, plus niacin and calcium.
The product is also made in the USA in a GMP-certified facility and is third-party safety tested for purity.
Things to Consider:
The transparent label is useful, although people specifically looking for high-dose arginine or citrulline may find the amounts modest compared with some research protocols.
It’s a practical choice for anyone who prefers knowing the exact quantity of every active ingredient.
Pros
- Easy gummy format.
- Contains both arginine and citrulline.
- Vegan and gelatin-free.
- Third-party lab tested.
Cons
- No customer reviews available on the official site
- Does not offer refund
Form: Gummies | Dosage: 2 Gummies | Key Ingredients: L-Arginine HCl, L-Arginine AKG, L-Citrulline DL-Malate, Beet Root, Niacin | Refund Policy: Not Stated
Description:
NEXTDIA is the easiest option to understand if swallowing capsules is the part of supplementation you dislike.
Two lemon-flavoured gummies provide 400 mg L-arginine HCl, 400 mg L-arginine AKG, 400 mg L-citrulline DL-malate, and 100 mg beetroot powder.
The formula is also sugar-free, vegan, gelatin-free, gluten-free, non-GMO, and labelled as third-party lab tested.
Things to Consider:
The gummy format is clearly about convenience rather than squeezing several grams of amino acids into a serving.
If you want an easy L-arginine nitric oxide supplement, it fits nicely. For higher-dose sports nutrition, capsules or powders may be more practical.
Comparison Table
| Our Top Picks | WOWMD L-Citrulline + L-Arginine Stack | GaraHerb | VB Health Load Boost | Arazo Nutrition L-Arginine | NEXTDIA Gummies |
|---|---|---|---|---|---|
| Third-party tested | Lab/testing information available | No | Yes | Yes | Yes |
| Highlights | Focused citrulline + two-form arginine stack for circulation and workouts. | L-citrulline with herbs and nutrients aimed at men’s vitality. | Arginine/citrulline blend with reproductive-wellness ingredients. | Transparent arginine, citrulline, niacin, and beta-alanine formula. | Lemon gummies with arginine, citrulline, beetroot, and niacin. |
| Customer Rating |  4.9/5 |
 4.7/5 |
 4.5/5 |
 4.4/5 |
 4.2/5 |
| Return Policy | 60 Days | 60 Days | 100 Days | N/A | N/A |
| Shipping | Free U.S. Shipping Over $60 | Free Shipping | Free U.S. Shipping Over $50 | Amazon shipping terms apply | Standard shipping terms apply |
How Do L-Arginine and L-Citrulline Work?
The two amino acids support the same nitric oxide pathway, but they get there differently. L-arginine is used directly to make nitric oxide, while L-citrulline is converted into arginine after absorption. Interestingly, research suggests oral citrulline can raise circulating arginine more efficiently because it avoids much of the early breakdown that affects arginine itself.
That helps explain why the two are often paired. Higher arginine availability can support nitric oxide signalling, which is involved in blood-vessel relaxation, circulation, and nutrient delivery during exercise.
The practical takeaway is simple: they support the same system from different angles. That makes the combination appealing for circulation and training support, although actual performance benefits can still vary by dose, exercise type, and individual response.
Read Also: Benefits of L-Arginine For Men
Factors to Consider When Choosing a Supplement
Here are some factors you might want to consider
Ingredient Amounts
Check the full daily serving, not just whether “L-citrulline” appears somewhere on the label.
Arginine and Citrulline Forms
You may see L-arginine HCl, arginine AKG, straight L-citrulline, or citrulline malate. Different products often combine more than one form.
Extra Ingredients
Beetroot, niacin, and beta-alanine fit naturally into workout formulas. Herbs and reproductive-health ingredients make more sense when your goal is broader than exercise.
Format
Capsules are straightforward and portable. Gummies are easier for people who dislike pills, while powders can accommodate larger amino-acid servings.
Label Transparency
A proprietary blend tells you the total amount but not how much of each ingredient you’re actually getting. Fully disclosed labels make comparison easier.
Did You Know?
- DYK? L-citrulline isn’t simply a weaker version of arginine. Your body converts it into arginine, and human research shows it can raise circulating arginine effectively.
- DYK? Neither L-arginine nor L-citrulline is a stimulant. They won’t create the same wired feeling you might get from a caffeinated pre-workout.
- DYK? A bigger muscle pump during training doesn’t automatically mean more muscle growth. Training quality, protein intake, sleep, and recovery still matter far more.
- DYK? Citrulline research is mixed. Some studies are encouraging, while pooled research has not found consistent improvements across every type of exercise.
L-Arginine and L-Citrulline Supplement Checklist
- Check whether the formula contains one or both amino acids.
- Read the amount per full serving.
- Look for clearly named ingredient forms.
- Check for proprietary blends.
- Compare it with your current pre-workout.
- Look for third-party testing.
- Choose a format you’ll actually use.
- Follow the recommended serving.
- Don’t assume more milligrams always means better results.
How to Use L-Arginine and L-Citrulline Supplements
Start with the directions on your particular product. Some formulas are designed for once-daily use, while others suggest taking them around your workout.
There isn’t one universal L-arginine or L-citrulline dosage because formulas and intended uses vary considerably. Research has also used very different amounts depending on the outcome being studied.
If your pre-workout already contains citrulline or arginine, check the label before adding another product. It’s surprisingly easy to double up without noticing.
Also Read: Can L-Arginine and L-Citrulline Help Erectile Dysfunction
Potential Risks and Side Effects
L-arginine and L-citrulline are generally well tolerated, but some people may notice stomach discomfort, nausea, bloating, or loose stools, particularly with larger servings.
Because these ingredients are associated with vascular function, people taking blood-pressure medication, nitrates, or other medicines that affect circulation should check with a healthcare professional before using them.
The same advice applies if you have cardiovascular or kidney concerns, are pregnant or nursing, or are preparing for surgery.
Products marketed around sexual performance should also be kept in perspective. Persistent erectile or reproductive concerns deserve medical assessment rather than relying on a supplement alone.
Conclusion
The best L-arginine and L-citrulline supplement depends on what you actually want it for.
GaraHerb and Load Boost lean more towards men’s wellness. Arazo gives you a clearly disclosed sports formula, while NEXTDIA is the easiest option for people who prefer gummies.
WOWMD L-Citrulline + L-Arginine Stack is our best overall choice because the formula stays focused. It combines citrulline malate with two forms of arginine in a straightforward, stimulant-free two-capsule serving.
Ultimately, the best product is one whose formula makes sense for your routine—not simply the one with the loudest nitric-oxide claims.
FAQs
References
WOWMD follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, qualified experts, and information from top institutions.
- Pharmacokinetic and Pharmacodynamic Properties of Oral L-Citrulline and L-Arginine: Impact on Nitric Oxide Metabolism. https://pubmed.ncbi.nlm.nih.gov/17662090/
- Effects of Citrulline Supplementation on Different Aerobic Exercise Performance Outcomes: A Systematic Review and Meta-Analysis. https://pubmed.ncbi.nlm.nih.gov/36079738/
- Effects of Arginine Supplementation on Athletic Performance Based on Energy Metabolism: A Systematic Review and Meta-Analysis. https://pubmed.ncbi.nlm.nih.gov/32370176/