Research
Metabolic adaptation
There was no significant effect of either whey or soy protein supplementation on lean body mass (LBM).
Practitioners should note that protein supplementation may not significantly increase lean body mass.
StrongRefutesmedium confidence
The analysis found no significant effect of either whey or soy protein supplementation on LBM.
Why this rating
Based on a systematic review and meta-analysis.
Source
The Impact of Whey and Soy Protein Supplementation on Resistance Training in Young Adults: A Systematic Review and Meta-Analysis
Brandon Davis et al. · Journal of Dietary Supplements · 2025
Meta-analysis
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