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For example, this study by Funk et al
Collagen Peptides What It Is: Collagen peptides are hydrolyzed fragments of naturally occurring structural protein, most often sourced from bovine hide, fish skin, or eggshell membrane, and are classified as a dietary/nutraceutical protein supplement rather than a synthetic signaling peptide
Its components are studied for blood supply, repair-cell movement, collagen, and inflammation rather than muscle growth. No controlled KLOW trial has measured muscle growth or delayed-onset muscle soreness
A study published in the New England Journal of Medicine in 2021 found that certain injectable medications led to significant weight loss in adults with obesity
