Supplement analysis backed by scientific evidence · PT

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Limited evidencePhysical performance

L-Valine

The third branched-chain amino acid, marketed for endurance and recovery. There are no meaningful trials of valine on its own, and the evidence for BCAA mixtures is itself modest.

Evidence last reviewed: August 2026

What the science says

  • No isolated-valine trials Limited evidence

    Systematic reviews of BCAA supplementation cover leucine-dominant mixtures. Valine alone has not been tested for performance or recovery in randomised human trials.

  • BCAA mixtures reduce soreness modestly Moderate evidence

    Meta-analyses of randomised trials find BCAA supplementation lowers post-exercise muscle soreness and creatine kinase, with small pooled effects that shrink in higher-quality studies.

  • Endurance benefit is not established Limited evidence

    A systematic review of BCAAs and endurance performance found biochemical changes that did not translate into consistent improvements in clinical or performance outcomes.

Dosage & safety

Studied doseNo studied dose for valine alone. It appears at roughly 1–2.5 g per serving in standard 2:1:1 BCAA products.
SafetyWell tolerated at supplement doses. Contraindicated in maple syrup urine disease. With adequate total protein intake, isolated BCAA supplementation is largely redundant.

Scientific references

Where to buy

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