Soy protein is the only plant protein with a PDCAAS of 1.0 (matching whey and casein for amino acid quality). Contains isoflavones (see isoflavones.md). A 2010 meta-analysis of 15 studies found soy protein does NOT reduce testosterone or increase estrogen in men — the 'feminization' fear is unfounded. 20-40g/day for muscle protein synthesis. Inferior to whey for acute MPS due to lower leucine content (6.7% vs 11%) but equivalent for long-term muscle building when total protein is adequate. --- *Reviewed by the Dose AI Research Team and Clinical Advisory Board* *Last updated: 2026-04-06*
Based on independent third-party laboratory analysis
Category pass rate: ~75% pass rate for protein content. Heavy metal contamination is the bigger concern — 84% contain detectable arsenic, lead, or cadmium.
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.