Research has shown that collagen supplementation can help to enhance muscle mass and strength, following resistance strength training (1). In a research study, 53 elderly men with sarcopenia (age-related muscle loss) experienced a significant increase in muscle strength after 3 months of supplementing with collagen peptides (2).
Referenced sources:
Oertzen-Hagemann, V, et al. (2019) Effects of 12 Weeks of Hypertrophy Resistance Exercise Training Combined with Collagen Peptide Supplementation on the Skeletal Muscle Proteome in Recreationally Active Men.
Nutr, Br J. (2015) Collagen peptide supplementation in combination with resistance training improves body composition and increases muscle strength in elderly sarcopenic men: a randomized controlled trial.