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Evidence-Based Supplement Research
Evidence-Based Supplement Research
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Soy Protein and Improved Walking Speed

Research synthesisModerate evidenceModerate effect3 studies · 3 beneficial · 0 neutral · 0 harmful

Across 3 studies, all 3 reported beneficial moderate-sized effects of soy protein on improved walking speed, with statistically significant findings in each. Effects were typically observed at 8–12 weeks (median study duration 87 days). The evidence primarily comes from older and pre-frail or frail adult populations, and one study suggested benefit at a dose of 14.5 g/day.

  • Effective dose range: 14.5 g/day
  • Studied populations: elderly adults, pre-frail and frail elderly

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Two of three studies did not report the form of soy protein, and benefits may depend on concurrent exercise training.

Generated Jul 12, 2026
Doses used in studies
  • g/day: 14.5 (median 14.5, IQR 14.5–14.5) — 1 study
Time to effect
Median: 2.9 months · IQR 2.9 months–3 months · Range 2.8 months–3 months — Reported in 2 of 3 studies
3 of 3 papers
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