The impact of collagen protein ingestion on musculoskeletal connective tissue remodeling: a narrative review

Holwerda AM, van Loon LJC · Nutrition Reviews

Concludes collagen's glycine/proline content plausibly supplies precursors for connective-tissue synthesis, but that direct evidence collagen ingestion increases connective-tissue protein synthesis in humans remains unclear and largely biomarker-based.

Population

Narrative review of human collagen/gelatin ingestion studies

Limitations

Narrative (not systematic) review; independent group but evidence base itself is small and surrogate-heavy.