Best Protein Powder 2026: Whey vs Plant vs Casein

Not all protein powders are equal. The amino acid profile, leucine content, and digestibility determine muscle protein synthesis outcomes. Here’s what the research shows about each type.

Protein Types Compared

What to Look For

Avoid proprietary blends: When amino acids are listed as a “blend” without individual amounts, it hides amino spiking (adding cheap non-essential amino acids like glycine/taurine to inflate protein content artificially).

Third-party testing: NSF Certified for Sport or Informed Sport — essential if you compete in drug-tested sports. Also ensures heavy metal safety.

Leucine threshold: Ensure each serving provides 2.5–3g leucine minimum — the threshold to maximally activate mTORC1 for muscle protein synthesis. Related: How Much Protein Per Day?

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