Protein powder supplementation increases muscle growth in people doing resistance training.

Is it true that protein powder supplementation increases muscle growth in people doing resistance training?

Partly. Evidence is mixed and partial: a review and one 12-week trial in older adults report greater muscle mass or strength gains with protein supplementation plus resistance training, while a peanut protein trial and an HMB trial in trained males found no significant added benefit. No item settles the general claim across populations.

Verdict: CONTESTED PARTIAL · 4 sources for, 2 against · Last checked 2 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Noh, K. & Park, S. (2023). Effects of resistance training and protein supplementation interventions on muscle volume and muscle function: sex differences in humans. doi.org. https://doi.org/10.20463/pan.2023.0033

Effects of Peanut Protein Supplementation on Resistance Training Adaptations in Younger Adults. (2021). doi.org. https://doi.org/10.3390/nu13113981

Mateusz, P., Karolina, Z., & Aleksandra, O. (2023). The quantity, quality, and daily distribution of protein supplementation in maximizing muscle hypertrophy induced by resistance training. zenodo.org. https://doi.org/10.12775/JEHS.2023.16.01.004

Poster 363: Post-Operative Protein Supplementation following Orthopaedic Surgery: A Systematic Review. (2023). doi.org. https://doi.org/10.1177/2325967123s00326

Effect of Intake of Leucine-Rich Protein Supplement in Parallel with Resistance Exercise on the Body Composition and Function of Healthy Adults. (n.d.). cir.nii.ac.jp. https://doi.org/10.3390/nu14214501

Effects of Calcium â-Hydroxy-â-methylbutyrate (HMB) Supplementation During Resistance-Training on Markers of Catabolism, Body Composition and Strength. (1999). doi.org. https://doi.org/10.1055/s-1999-8835