Whey protein
Protein
Reviewed human evidence related to whey protein. Effects depend on dose and context.
Last reviewed: 2026-09-16
Aliases: whey protein isolate, whey protein concentrate
Reviewed outcomes
Muscle protein synthesis
Whey protein · increase · Magnitude unknown
Adequate high-quality protein supports muscle protein synthesis after training.
strong evidence · Human data reviewedEvidence, caveats & sources›Narrow post-workout window
Whey protein · no clear effect · Magnitude unknown
Evidence does not establish that protein must be consumed within one hour of exercise.
moderate evidence · Human data reviewedEvidence, caveats & sources›