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Citrulline Malate and Training Performance: +6.4% Reps, or No Real Effect at All?

Citrulline malate is a staple ingredient in nearly every pre-workout on the market, marketed as a way to squeeze out noticeably more reps at the gym. The largest meta-analysis on this topic to date (2026, 30 studies, 644 people) found a real but small effect — about 6.4% more reps in an earlier, narrower analysis — rated low certainty of evidence, while a separate, independent meta-analysis of the same question found no statistically significant effect at all.

MNMichał NowakAugust 25, 202611 min read
Table of contents

TL;DR — key takeaways

Why citrulline malate holds such a strong marketing position

Citrulline malate is a combination of the amino acid L-citrulline with malic acid (malate), promoted mainly for its hypothesized effect on nitric oxide production in the body — a compound that dilates blood vessels and theoretically improves the delivery of blood, and thus oxygen and nutrients, to working muscles during exercise. This biologically plausible mechanism made citrulline malate one of the most commonly added ingredients in pre-workouts across the entire sports supplement market.

The problem is that a plausible biological mechanism doesn't always translate into an equally clear, practical effect at the gym — and the literature on citrulline malate is more ambiguous than its marketing popularity suggests. Two independent meta-analyses, including one published as recently as 2026, give answers to this question worth knowing before your next pre-workout purchase.

This article concerns strength training, not endurance exercise

The studies discussed here focus mainly on rep count and performance in resistance (strength) training — the mechanism and scale of the effect may differ in endurance sports, which aren't the main focus of this article.

What the newest, largest meta-analysis shows

The starting point is the 2026 work by Wang and colleagues, published in the journal Nutrients — the broadest meta-analysis on this topic to date, using an advanced, three-level statistical methodology allowing multiple effect estimates from the same studies to be incorporated without overinflating the precision of the result.

Effects of Citrulline Malate Supplementation on Exercise Performance: A Systematic Review and Three-Level Meta-Analysis

Moderate evidence

Wang X, Fan X, Chang J et al. · Nutrients · 2026

The meta-analysis covered 30 randomized trials, 138 effect estimates, and 644 participants. The overall effect size was g=0.16 (p=0.01) — statistically significant, but small. The authors noted that prediction intervals were wide and statistical power limited, and certainty of evidence per the GRADE system was rated low to very low.

View study

Statistically significant, but low certainty of evidence

Moderate evidence

This is an important distinction: "statistically significant" isn't the same as "certain" or "solid." An effect size of g=0.16 is a small value, and the meta-analysis authors themselves rated the certainty of evidence as low — meaning further studies could still meaningfully shift this result, in either direction.

What an earlier meta-analysis focused on repetitions shows

The earlier 2021 work by Vårvik, Bjørnsen, and Gonzalez, published in the International Journal of Sport Nutrition and Exercise Metabolism, took a narrower focus — exclusively on the number of repetitions performed to failure during strength training, after acute (single-dose) supplementation.

Acute Effect of Citrulline Malate on Repetition Performance During Strength Training: A Systematic Review and Meta-Analysis

Moderate evidence

Vårvik FT, Bjørnsen T, Gonzalez AM · International Journal of Sport Nutrition and Exercise Metabolism · 2021

The meta-analysis covered 8 studies with 137 participants, using doses of 6-8 g of citrulline malate 40-60 minutes before training. Repetitions increased by an average of 3±5 (6.4±7.9%) versus placebo (p=0.022), with a small effect size, SMD=0.196. The effect for lower-body work was borderline significant (SMD=0.27; p=0.051), and non-significant for upper-body work (SMD=0.16; p=0.131).

View study

A stronger effect for lower-body work than upper-body

Moderate evidence

This is a practically useful detail: citrulline malate's effect was closer to statistical significance for lower-body exercises (e.g., squat, leg press) than for upper-body exercises (e.g., barbell press, rowing) — although even the former result was borderline significant (p=0.051), so it shouldn't be treated as unambiguously confirmed.

Why two meta-analyses of the same topic give different conclusions

It's worth honestly noting that not every citrulline malate meta-analysis reaches the same conclusion — an earlier 2022 work by Aguiar and Casonatto found an overall effect that wasn't statistically significant (SMD=0.13; 95% CI -0.21 to 0.46), in contrast to the small but significant effects shown in the two works discussed above. Such a discrepancy between independent meta-analyses of the same topic is a signal that the effect, if it exists at all, sits close to the limit of statistical detectability given the current number and quality of available studies.

Myth

Citrulline malate is a proven, reliable way to get noticeably more reps in your workout.

Fact

The largest meta-analysis to date (2026) found a statistically significant but small effect, with low certainty of evidence per the GRADE system. Another, earlier meta-analysis of the same topic (Aguiar and Casonatto, 2022) found no statistically significant effect at all — the discrepancy between independent analyses suggests the effect, at best, is small and uncertain, not guaranteed.

This doesn't mean citrulline malate definitely doesn't work — it means that if an effect exists, it's too small or too inconsistent across studies to treat it today as a marketing certainty. This is an important distinction for anyone deciding whether to spend money on another supplement.

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What this means in practice

Practical takeaways from the meta-analyses discussed

  • Citrulline malate's effect on rep count, if it exists, is small (a few percent improvement) — don't expect a spectacular change
  • Typical dosing in studies is 6-8 g, taken 40-60 minutes before training
  • The effect appears somewhat stronger for lower-body exercises than upper-body, though the difference is small and borderline statistically
  • Independent meta-analyses of the same topic give discrepant conclusions (small significant effect vs. no significance), suggesting low overall certainty of evidence
  • Anyone looking for supplements with more solidly confirmed effects on strength performance might consider creatine first, described in our creatine entry, with a much stronger evidentiary foundation

In practice, this means citrulline malate isn't a supplement that should be prioritized on a limited supplementation budget — if you do reach for it, it's worth doing so with realistic expectations about the scale of the effect, not counting on a breakthrough change in rep count.

Limitations worth keeping in mind

What this data doesn't prove

All the meta-analyses discussed rest on a relatively small number of studies and participants (from 137 to 644 people total), and the authors of the newest, largest one (Wang et al., 2026) themselves rated the certainty of evidence as low to very low per the GRADE system — a standardized method for assessing the reliability of scientific evidence. The discrepancy in conclusions between independent meta-analyses of the same topic (significant effect in two works, no significance in a third) further weakens confidence in the real scale and existence of the effect.

Practical summary

QuestionShort answer
Does citrulline malate increase rep count?Possibly, but the effect is small and evidence certainty is low
By how much did rep count increase in studies?An average of 6.4% in Vårvik and colleagues' meta-analysis
Do all meta-analyses confirm the effect?No — one independent meta-analysis found no statistical significance
What dosing was used in studies?6-8 g, 40-60 minutes before training
Is this a priority strength supplement?No — creatine has a far more solid evidentiary foundation

Citrulline malate and training performance in brief

Our editorial recommendation

Citrulline malate is a good example of a supplement whose marketing popularity has outpaced the strength and consistency of the available scientific evidence. That doesn't mean it's useless — but an honest summary of the literature requires treating it as a supplement with a small, uncertain potential effect, not a sure thing.

If you already own citrulline malate or want to try it, reasonable dosing (6-8 g before training) carries no significant risk and might bring a small benefit. But if you're still planning your sports supplementation budget, it's worth considering options with more solidly confirmed effects on training performance first.

A discrepancy between independent meta-analyses of the same supplement is one of the most reliable signals that marketing popularity and the strength of scientific evidence are two different things.

Michał Nowak, VitMode editorial team

Frequently asked questions

Yes — citrulline malate is a combination of L-citrulline with malic acid (malate), while pure L-citrulline doesn't contain this addition. Most of the studies discussed concerned the malate form specifically, so the results don't necessarily translate directly to pure L-citrulline at the same dose.

No significant adverse effects were reported in the studies covered by the discussed meta-analyses at standard dosing of 6-8 g — the safety profile is generally considered good, regardless of uncertainty about the scale of benefit.

Both supplements act on different mechanisms (creatine — the phosphocreatine energy buffer, citrulline malate — a hypothesized effect on blood flow), so they could theoretically complement each other, though this wasn't the main focus of the meta-analyses discussed here — creatine has a much more solid evidentiary foundation, described in our creatine entry.

This usually results from differences in the selection of studies included in the analysis, statistical methods, and the time period the data comes from — when the effect of the studied intervention is small, close to the limit of statistical detectability, such discrepancies between independent research teams are more common than with interventions showing a large, clear effect.

Sources

MN

Michał Nowak

MSc in Clinical Dietetics, certified sports-nutrition coach

Michał started out as a long-distance runner, before an injury forced him to rethink his career. Looking for a faster way back into shape, he discovered sports nutrition and never left — fascinated by the gap between the research and what "everyone knows" at the gym. He completed a degree in clinical dietetics, earned a sports-nutrition coaching certification, and ran his own practice for several years before joining VitMode. His writing keeps returning to one theme: a supplement won't replace the basics, but the right one, at the right time, makes a real difference — and that's the difference he tries to describe precisely, with citations instead of slogans. He still runs, though these days, as he puts it, purely for the fun of it.

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Comments (2)

  • KW

    Kasia W. 2 weeks ago

    Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.

  • MT

    Marek T. a month ago

    Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.