Protein
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A macronutrient made of amino acid chains, essential for building and repairing body tissue. In supplement form it is typically isolated from sources such as whey, casein, soy, pea, or egg, and provided as a powder or added to bars and shakes.
Why it’s used
Taken to help meet daily protein needs, support muscle protein synthesis and recovery after exercise, or add protein to a diet where whole-food intake is limited.
What the evidence is for
supporting muscle protein synthesis and meeting daily protein requirements.
What the evidence says
Adequate protein intake is essential and well established as necessary for maintaining and building muscle tissue, particularly alongside resistance exercise. The specific benefit of a protein supplement versus getting equivalent protein from food is generally about convenience and total intake rather than the supplement itself having a unique effect; evidence supports meeting total daily protein targets rather than any particular supplemental source being superior.
Dose studied
20–40 g — per-meal protein doses studied for stimulating muscle protein synthesis.
Context
Research on muscle protein synthesis often examines per-meal doses of roughly 20 to 40 g of high-quality protein, with total daily intake recommendations for active adults commonly discussed in ranges above the general adult RDA, though these are population-specific research findings rather than a single fixed research dose.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.