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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.

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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.

How to take it

TimingTiming does not matter.
With food?With or without food.
Worth knowingValine is abundant in any protein source, so a scoop of whey delivers more of it than a valine capsule does.

Interactions

With medications

  • levodopa

    Branched-chain amino acids compete with levodopa for absorption and brain uptake, reducing its effect. separate by at least 1 to 2 hours

With other supplements

  • tyrosine, tryptophan or 5-HTP

    Shared amino acid transport means a big valine dose reduces their uptake. take them at different times of day

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does L-valine improve endurance or recovery?

L-valine has not been tested on its own for performance or recovery in randomised human trials, so its evidence is limited. A systematic review found BCAA mixtures did not produce consistent endurance improvements.

Do BCAAs with valine reduce muscle soreness?

BCAA mixtures containing valine have moderate evidence for modestly lowering post-exercise soreness and creatine kinase, but the effects are small and shrink in higher-quality studies. Those trials used leucine-dominant blends, not valine alone.

How much L-valine should I take?

There is no studied dose of L-valine alone; it appears at roughly 1–2.5 g per serving in standard 2:1:1 BCAA products. Valine is abundant in any protein, so a scoop of whey delivers more than a valine capsule.

Can I take L-valine with levodopa?

L-valine competes with levodopa for absorption and brain uptake, reducing the drug's effect, so separate them by at least 1 to 2 hours. L-valine is contraindicated in maple syrup urine disease.

Scientific references

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