Mars Nitric Oxide Capsules Review: The Science of L-Arginine, L-Citrulline & Adaptogens for Circulation, Endurance, and Recovery

 

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If you've ever hit the gym and felt like your muscles just weren't getting the blood flow they needed — that flat, sluggish feeling instead of a strong "pump" — the problem might not be your effort. It might be your nitric oxide levels.

Nitric oxide (NO) is one of the most researched molecules in modern sports science and cardiovascular medicine. It's the same molecule that won three American scientists the Nobel Prize in Physiology or Medicine back in 1998 for discovering its role as a signaling molecule in the cardiovascular system. Today, an entire category of "pump" and endurance supplements has been built around supporting the body's natural nitric oxide production — and Mars Nitric Oxide Capsules with L-Arginine, L-Citrulline & Adaptogens (60N) is one of the more comprehensive formulas in that space.

In this article, we'll walk through exactly what nitric oxide does in the body, break down the actual clinical research behind each ingredient in this formula, and give you a realistic, balanced picture of what this kind of supplement can — and can't — do for your circulation, endurance, and recovery.

Disclaimer: This article is for informational and educational purposes only. It is not medical advice and should not replace a conversation with your doctor, especially if you have a cardiovascular condition or take blood pressure medication. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease.

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Table of Contents

1. What Is Mars Nitric Oxide Capsules?
2. What Nitric Oxide Actually Does in Your Body
3. What's Inside the Formula
4. The Science Behind Each Ingredient
5. Connecting the Dots: From Blood Flow to Better Workouts
6. What the Research Really Says About NO Boosters as a Category
7. Who Might Benefit From This Formula
8. How to Take It the Right Way
9. Lifestyle Habits That Multiply Your Results
10. Safety, Side Effects, and Who Should Be Cautious
11. Frequently Asked Questions
12. Final Verdict

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1. What Is Mars Nitric Oxide Capsules?

Mars Nitric Oxide Capsules is a performance and circulation supplement made by Mars by GHC. Rather than relying on a single dose of one amino acid, the formula stacks multiple forms of nitric oxide precursors — including Arginine AKG 2:1, L-Arginine, L-Arginine HCl, L-Citrulline, and L-Citrulline Malate 2:1 — alongside three adaptogenic and antioxidant-rich botanicals: Ashwagandha, Moringa, and Maca Root.

The product is marketed around three core pillars:

• Circulation — supporting healthy blood flow through increased nitric oxide production
• Endurance — helping the body sustain output during exercise or long, demanding days
• Recovery — reducing fatigue and supporting the body's return to baseline after exertion

The suggested use is two capsules daily, ideally taken with water or a beverage of choice, and preferably with a meal for better absorption. Like most amino-acid and adaptogen blends, this is a supplement meant to complement an active lifestyle — not a stimulant, and not a substitute for cardiovascular medication or medical treatment of blood flow disorders.

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2. What Nitric Oxide Actually Does in Your Body

Before looking at the ingredients, it's worth understanding the actual physiology, because it explains why this entire category of supplement exists.

Nitric oxide is a gas produced naturally by the cells lining your blood vessels (the endothelium). Once released, it triggers relaxation of the smooth muscle in your artery walls — a process called vasodilation. When your blood vessels dilate:

• Blood flow increases, meaning more oxygen and nutrients reach your working muscles
• Blood pressure can be better regulated, since wider vessels reduce resistance to blood flow
• Waste products like lactate and carbon dioxide are cleared more efficiently from tissue after exercise
• The "pump" feeling during resistance training — that tight, full sensation in your muscles — is largely a visible effect of increased blood volume in the working muscle

The body produces nitric oxide primarily through an enzyme called nitric oxide synthase (NOS), which converts the amino acid L-arginine into nitric oxide and a byproduct called L-citrulline. Interestingly, your body then recycles that L-citrulline back into L-arginine in the kidneys, creating a natural feedback loop — which is part of the reason both amino acids show up together in supplements like this one.

As men age, or in the presence of high blood pressure, high cholesterol, smoking, or a sedentary lifestyle, natural nitric oxide production tends to decline — a condition researchers call endothelial dysfunction. This is one of the earliest measurable steps in the development of cardiovascular disease, which is part of why supporting healthy nitric oxide levels has become such a major focus in both sports nutrition and preventive cardiovascular research.

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3. What's Inside the Formula

The label for Mars Nitric Oxide Capsules lists:

1. Arginine Alpha-Ketoglutarate (AKG) 2:1
2. L-Arginine
3. L-Arginine HCl
4. L-Citrulline Malate 2:1
5. L-Citrulline
6. Ashwagandha
7. Moringa
8. Maca Root

This is a layered approach: multiple forms of arginine and citrulline are included together, likely to address the well-documented absorption limitations of arginine alone (more on that below), while the three botanicals are included to support stress resilience, antioxidant status, and general vitality alongside the circulation-focused amino acids.

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4. The Science Behind Each Ingredient

L-Arginine: The Original Nitric Oxide Precursor

L-arginine is the direct substrate that nitric oxide synthase converts into NO. It's a semi-essential amino acid, meaning your body can produce some on its own, but supplementation can raise circulating levels further.

The challenge with oral L-arginine, which researchers have documented extensively, is bioavailability. When you swallow arginine, a large portion of it is broken down by an enzyme called arginase in your gut and liver before it ever reaches your bloodstream — a phenomenon known as first-pass metabolism. This is a major reason why some studies on oral arginine alone have shown weaker or inconsistent effects on blood flow compared to intravenous arginine, and it's also the scientific rationale for why modern formulas increasingly pair arginine with citrulline, which bypasses this issue (explained below).

That said, arginine still has documented benefits. Multiple clinical trials have linked arginine supplementation to modest improvements in flow-mediated dilation (a standard clinical measure of blood vessel function) and to reduced blood pressure in people with elevated baseline readings, particularly when taken consistently over several weeks.

Arginine Alpha-Ketoglutarate (AKG): A Bioavailability Boost

Arginine AKG combines L-arginine with alpha-ketoglutarate, a compound involved in your body's energy production cycle (the Krebs cycle). Some research in strength-training populations suggests this combination form may support better nitrogen retention and exercise capacity compared to standard arginine alone, though the human research base on this specific compound is smaller than on arginine or citrulline individually. Its inclusion here is best understood as a complementary form rather than the primary active ingredient.

L-Citrulline: The More Bioavailable Path to Nitric Oxide

This is arguably the most important ingredient in the formula from a research standpoint. L-citrulline is converted into L-arginine in the kidneys after absorption, which means it largely sidesteps the first-pass gut metabolism problem that limits direct arginine supplementation. Research has repeatedly shown that oral citrulline supplementation raises blood arginine levels more effectively than an equivalent dose of arginine itself.

A randomized, double-blind, placebo-controlled crossover study published in the Journal of the International Society of Sports Nutrition had trained male cyclists take 2.4 grams of L-citrulline daily for seven days. The citrulline group completed a 4-kilometer cycling time trial significantly faster than the placebo group, and also reported reduced subjective muscle fatigue immediately after exercise.

Other research has been more mixed. A 2025 randomized crossover trial published in Frontiers in Sports and Active Living found that even a higher-dose, 10-day citrulline protocol did not significantly improve time-to-exhaustion in endurance exercise, and the authors noted that the broader research base on citrulline's ergogenic effects remains inconsistent. Similarly, a study on resistance-trained men and women found that a single 8-gram dose of citrulline before training did not meaningfully improve strength or muscle oxygenation during a single workout session.

Where the evidence is more consistent is in citrulline's effect on vascular function specifically, rather than raw athletic performance numbers. A study in postmenopausal women with hypertension found that four weeks of citrulline supplementation significantly improved flow-mediated dilation (a marker of blood vessel health), reduced resting blood pressure, and improved blood flow and muscle oxygenation during handgrip exercise, compared to placebo. Separately, citrulline supplementation over seven days was shown to improve muscle tissue oxygenation during cycling in young, active men, suggesting improved microvascular perfusion.

The honest takeaway: citrulline has fairly strong evidence for supporting vascular function and blood flow — which lines up well with the "circulation" claim on this product's label — while its effects on raw exercise performance numbers (like time-to-exhaustion or strength output) are more inconsistent and likely depend on dose, training status, and how long it's taken.

L-Citrulline Malate: The Combination Form

L-Citrulline Malate combines citrulline with malate, a compound involved in the Krebs cycle that plays a role in cellular energy production. Because malate is thought to support ATP regeneration during exercise, some researchers believe citrulline malate may offer combined vascular and energy-metabolism benefits compared to citrulline alone, particularly for reducing the perception of fatigue during resistance training. Human trials specifically isolating the malate component are still limited, so its inclusion is best understood as a complementary addition to the citrulline in this formula rather than a separately proven ingredient.

Ashwagandha: Stress Resilience Meets Recovery

Ashwagandha (Withania somnifera) shows up again here, and for good reason — its research base overlaps meaningfully with what this formula is trying to achieve. As an adaptogen, ashwagandha helps regulate the hypothalamic-pituitary-adrenal (HPA) axis, which governs your cortisol (stress hormone) response.

Clinical trials on ashwagandha have shown improvements in muscular strength, VO2 max (a measure of cardiovascular endurance capacity), and reduced exercise-induced muscle damage, as measured by lower creatine phosphokinase levels after training. Since chronic stress and elevated cortisol are known to constrict blood vessels and impair vascular function over time, ashwagandha's stress-lowering effect provides a plausible complementary mechanism to the direct nitric oxide precursors in this formula — addressing the hormonal side of recovery, not just the blood-flow side.

Moringa: The Antioxidant Support Layer

Moringa oleifera, sometimes called the "miracle tree," is a nutrient-dense plant rich in polyphenols, flavonoids, and vitamins. Its research base is centered primarily on antioxidant activity and cardiovascular support. Multiple reviews of both animal and preliminary human research suggest moringa may help support healthy blood pressure and reduce oxidative stress in blood vessel walls, partly through mechanisms that involve — you guessed it — enhancing nitric oxide bioavailability and reducing the breakdown of NO by reactive oxygen species.

It's important to be balanced here: a 2025 meta-analysis of randomized controlled trials on moringa supplementation found that while there was a modest blood-pressure-lowering effect in some studies, the overall evidence from human trials remains limited by small sample sizes and inconsistent study designs. So moringa's role in this formula is best understood as a supportive antioxidant ingredient with promising, but not yet definitive, human clinical backing — it may help protect the nitric oxide that your body produces, rather than substantially boosting NO production on its own.

Maca Root: Energy, Stamina, and a More Nuanced Libido Story

Maca (Lepidium meyenii) is a Peruvian root vegetable with a long traditional history as an energy and stamina booster. The clinical picture here is genuinely mixed, and worth being upfront about.

On the performance side, a small placebo-controlled pilot study on trained cyclists found that maca supplementation for two weeks modestly improved 40-kilometer time trial performance. Another crossover study found a similar improvement in elite female handball players during high-intensity activity. However, a broader research review (via the supplement research database Examine.com) notes that the overall evidence for maca improving athletic performance remains weak and preliminary, with mixed results across the small number of available trials.

On the libido and sexual function side, a 12-week randomized, double-blind, placebo-controlled trial in healthy men found that maca improved self-reported sexual desire compared to placebo — notably, without any measurable change in testosterone or estradiol levels, suggesting maca's effects here work through a different pathway than direct hormone modulation. A broader systematic review of maca and sexual function concluded that the evidence, while suggestive, remains limited due to the small number and size of quality trials conducted so far.

The fair summary: maca has a reasonable amount of preliminary human evidence for supporting energy, stamina, and sexual desire, but it should be viewed as a supportive, traditional-use ingredient rather than one with strong, definitive performance-enhancing data behind it.

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5. Connecting the Dots: From Blood Flow to Better Workouts

It's worth explaining, in plain terms, how the ingredients in this formula are meant to work together across a training session:

• Before your workout: Arginine and citrulline are absorbed and gradually raise circulating nitric oxide precursor levels, supporting vasodilation as you begin exercising.
• During your workout: Improved blood flow theoretically means better oxygen and nutrient delivery to working muscles, which is the physiological basis of the "pump" sensation lifters chase, and may also support endurance during sustained efforts.
• Immediately after your workout: Better circulation supports faster clearance of metabolic byproducts like lactate, which is part of why some citrulline research shows reduced perceived muscle fatigue after exercise.
• In the hours and days after: Ashwagandha's cortisol-lowering effect and moringa's antioxidant activity are thought to support the body's broader recovery environment — helping manage the inflammation and stress-hormone response that comes with hard training, separate from the direct blood-flow mechanism of the amino acids.

This layered approach — direct vascular support from amino acids, plus indirect hormonal and antioxidant support from adaptogens — is a genuinely reasonable, evidence-informed way to build a "circulation and recovery" formula, even though (as covered above) not every individual ingredient has bulletproof human trial data on its own.

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6. What the Research Really Says About NO Boosters as a Category

Zooming out, it's worth being honest about where the nitric oxide supplement category stands scientifically in 2026.

The strongest, most consistent evidence in this space is for vascular function markers — flow-mediated dilation, resting blood pressure, and muscle oxygenation during exercise. Multiple independent trials on citrulline and arginine have shown measurable improvements here, particularly in people who start with some degree of reduced vascular function (such as older adults or those with elevated blood pressure).

The evidence is considerably weaker and more inconsistent for direct athletic performance outcomes like time-to-exhaustion, one-rep max strength, or race times. Some trials show meaningful improvement; others, using similar or even higher doses, show none. Sports nutrition researchers who have reviewed this literature generally conclude that nitric oxide precursors may offer a real but modest ergogenic effect for some people, particularly in longer, sustained-effort activities, but they are not a guaranteed performance enhancer for everyone in every context.

This distinction matters for setting expectations. If your primary goal is supporting healthy circulation, blood pressure, and the "pump" feeling during training, the research is reasonably encouraging. If you're expecting a dramatic, guaranteed jump in your squat max or 5K time, the current science doesn't fully support that as a universal outcome.

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7. Who Might Benefit From This Formula

Based on the ingredient research above, this type of nitric oxide and adaptogen formula may be worth considering if you:

• Train regularly and want support for workout blood flow, the muscle "pump," and post-exercise recovery
• Are over 35–40, an age range where natural nitric oxide production and vascular function typically begin to decline
• Deal with everyday fatigue or stress and want an adaptogen-supported approach alongside circulation support
• Have already had blood pressure checked and are looking for a general wellness supplement to support healthy circulation as part of an active lifestyle
• Are looking for a non-stimulant pre-workout alternative, since this formula does not appear to rely on caffeine or other stimulants for its effects

This is not a substitute for prescribed cardiovascular medication, and it's not intended for anyone with a diagnosed heart condition without first talking to a doctor — a point we'll come back to in the safety section.

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8. How to Take It the Right Way

Based on the product label:

• Take 2 capsules daily
• Best taken with water or your preferred beverage
• Consume with a meal for optimal absorption

Because several of the key ingredients — particularly citrulline and ashwagandha — showed their clearest effects in trials lasting one to eight weeks (rather than as a single acute dose), this is best approached as a consistent daily supplement rather than a same-day "pre-workout" fix, even though some users do report a same-day pump effect from the amino acid content. Give it a fair trial period, generally 4 to 8 weeks, before evaluating whether it's making a meaningful difference for you.

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9. Lifestyle Habits That Multiply Your Results

Nitric oxide production is deeply tied to overall cardiovascular health, so lifestyle factors matter just as much here as they did with hormonal support supplements. A few evidence-based habits that work synergistically with this type of formula:

1. Cardiovascular exercise. Regular aerobic activity is one of the most well-documented ways to improve endothelial function and natural nitric oxide production over time, independent of any supplement.

2. Eat nitrate-rich vegetables. Leafy greens and beetroot are natural dietary sources of nitrates, which your body also converts into nitric oxide through a separate pathway (the nitrate-nitrite-NO pathway) from the one arginine and citrulline use. Combining both approaches is a reasonable, food-first strategy.

3. Don't smoke, and moderate alcohol. Smoking is one of the most damaging factors for endothelial function and nitric oxide bioavailability, and heavy alcohol use has similarly been linked to impaired vascular health.

4. Manage blood pressure and cholesterol. If you have known hypertension or high cholesterol, addressing these with your doctor will do more for your long-term vascular health than any supplement alone — though, as noted, some of the ingredients here may offer complementary support once cleared by a physician.

5. Stay hydrated. Blood volume and viscosity directly affect circulation, so adequate hydration supports the same goals this supplement is targeting.

6. Manage stress. Since ashwagandha's mechanism runs through cortisol regulation, pairing the supplement with actual stress-reduction habits (sleep, downtime, movement) gives it a better foundation to work from.

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10. Safety, Side Effects, and Who Should Be Cautious

A few important safety notes worth knowing before starting this or any nitric oxide supporting supplement:

• Blood pressure medication: Because arginine, citrulline, and moringa all have documented blood-pressure-lowering properties in research, combining this supplement with prescription blood pressure medication could theoretically compound the effect. Anyone on antihypertensive medication should talk to their doctor before starting.
• Nitrate medications: Men taking nitrate-based medications (commonly prescribed for angina) or PDE5 inhibitors (like sildenafil) should be especially cautious and consult a doctor, since combining multiple nitric-oxide-pathway compounds could have an additive effect on blood pressure.
• Herpes virus considerations: Some research suggests high-dose arginine may be associated with herpes simplex virus reactivation in susceptible individuals, since arginine is used by the virus for replication. Anyone with a history of recurrent cold sores or genital herpes should be aware of this and discuss it with a healthcare provider.
• Ashwagandha cautions: As noted in prior research, ashwagandha isn't recommended during pregnancy, and rare reports of liver-related concerns have occurred at high doses, reinforcing the importance of sticking to labeled serving sizes.
• Moringa and thyroid function: Moringa contains compounds that, in very high amounts, may interact with thyroid function, so those with thyroid conditions should mention any supplement use to their doctor.
• Maca and hormone-sensitive conditions: Maca is generally well tolerated, but individuals with hormone-sensitive conditions or thyroid disorders should exercise caution given its goitrogenic compounds.
• General gut tolerance: Arginine and citrulline are both generally well tolerated, though some people report mild digestive upset (bloating or loose stools) at higher doses.

If you experience any unusual symptoms — dizziness, unusually low blood pressure readings, or gastrointestinal distress — after starting this supplement, discontinue use and speak with a healthcare provider.

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11. Frequently Asked Questions

Will this give me a noticeable "pump" the same day I take it? Some users do report feeling a difference in vascularity or muscle fullness during the same training session, since arginine and citrulline are absorbed relatively quickly. However, the clinical research on vascular function and recovery benefits generally reflects consistent daily use over one to eight weeks, not a single dose.

Is this the same as a pre-workout supplement? Not exactly. Most traditional pre-workouts rely heavily on caffeine and other stimulants for their "energized" feeling. This formula does not appear to contain stimulants — its effects are based on amino acid-driven blood flow support and adaptogenic stress support, so the experience is generally more subtle and cumulative than a classic stimulant pre-workout.

Can I take this if I already take a blood pressure medication? You should talk to your doctor first. Several ingredients in this formula have blood-pressure-lowering properties in research, and combining them with prescription medication could have an additive effect that needs medical supervision.

Why does the formula include both arginine and citrulline instead of just one? Because of how the body processes them. Oral arginine is broken down significantly before it reaches the bloodstream (first-pass metabolism), while citrulline bypasses much of that process and is converted to arginine in the kidneys. Using both together is a common strategy in the sports nutrition research space to maximize the amount of usable arginine that actually reaches circulation.

Is Maca Root in this formula going to definitely boost my libido? The evidence suggests a modest, plausible benefit for sexual desire based on a small number of quality trials, but it's not a guaranteed or dramatic effect for every user, and more research is still needed.

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12. Final Verdict

Mars Nitric Oxide Capsules brings together a genuinely research-supported category of ingredients — arginine and citrulline for nitric oxide production and vascular function, layered with ashwagandha, moringa, and maca for stress resilience, antioxidant support, and general vitality. The vascular science behind citrulline in particular is fairly solid, with multiple trials showing real improvements in blood flow, blood vessel function, and muscle oxygenation. The direct athletic performance data is more mixed, and the botanical ingredients — while promising — generally have smaller and more preliminary human evidence bases than the core amino acids.

Taken together, this is a formula best suited to men who want support for healthy circulation, workout blood flow, and recovery as part of an already active lifestyle — not a guaranteed shortcut to a bigger pump or a faster mile time. Combined with regular cardiovascular exercise, a nitrate-rich diet, good hydration, and appropriate medical guidance if you're on blood pressure medication, it's a reasonably evidence-informed addition to a men's performance and wellness routine.

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References

• Suzuki, T., et al. (2016). Journal of the International Society of Sports Nutrition — Oral L-citrulline supplementation enhances cycling time trial performance.
• Frontiers in Sports and Active Living (2025) — Ergogenic effects of 10-day L-citrulline supplementation on time to exhaustion.
• Journal of the International Society of Sports Nutrition (2023) — Acute effect of L-citrulline on resistance exercise performance and muscle oxygenation.
• PMC (2024) — L-Citrulline supplementation improves arterial blood flow and muscle oxygenation during handgrip exercise in hypertensive postmenopausal women.
• Verma, N., et al. (2023) — Ashwagandha root extract, muscle strength, VO2 max, and recovery markers.
• Biomolecules and Biomedicine (2026) — Moringa oleifera for blood pressure regulation and endothelial dysfunction: mechanisms and therapeutic potential.
• Nutrients (2025) — Effects of Moringa oleifera supplementation on cardiometabolic outcomes: a meta-analysis of randomized controlled trials.
• ScienceDirect (2009) — Pilot investigation into the effect of maca supplementation on physical activity and sexual desire in sportsmen.
• PMC — Maca (L. meyenii) for improving sexual function: a systematic review.
• Examine.com — Research breakdown on Maca and physical performance.

This article is independently written for educational purposes. It contains general health and wellness information and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting any new supplement, especially if you have a cardiovascular condition, take blood pressure medication, or take nitrate-based prescriptions.

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