L-citrulline / citrulline malate Evidence

Evidence posture

Exercise-performance evidence is limited and conflicting; some acute resistance-exercise studies are positive, but overall support remains weak.

What the evidence supports

NIH ODS states that research does not provide strong support for citrulline or citrulline malate as an ergogenic aid. A systematic review/meta-analysis found mixed evidence for acute strength and power outcomes.

Studied context

Many positive studies use citrulline malate rather than plain L-citrulline, sometimes around 8 g shortly before resistance exercise. These formulations are not interchangeable by name alone.

Safety context

Short-term studies report relatively few problems, though gastrointestinal discomfort occurs. Long-term supplemental safety is not well established.

Product directness

V-NITRO lists L-citrulline but does not publish its dose or a citrulline-malate formulation. The finished product should not inherit results from 8 g citrulline-malate trials.

Products that list this ingredient/category

Primary and authoritative sources

Review-level evidence highlights

Acute Effects of Citrulline Supplementation on High-Intensity Strength and Power Performance: A Systematic Review and Meta-Analysis (Systematic review and meta-analysis; PMID 30895562)

Population/scope: 12 studies; 13 independent samples; 198 healthy participants

Evidence scope: High-intensity strength and power performance

Finding: The pooled analysis found a statistically significant but small benefit versus placebo (Hedges' g 0.20).

Limitations: The effect was small, every individual study confidence interval crossed the null, and results may depend on citrulline form, dose, sex, age, and task.

Directness: Relevant human evidence · verified 2026-10-02

Important: Ingredient-level evidence is not proof that a finished product has the same effect. Dose, form, population, duration, and formulation must match.