Collagen and gelatin hydrolysis peptides show bioactive properties beyond basic nutrition, potentially influencing cells in the extracellular matrix and justifying their use in supplements and pharmaceuticals.
Beyond nutrition to bioactivityCollagen-derived peptides may exert biological effects on cells after ingestion, supporting their use in dietary supplements and pharmaceuticals beyond simple protein nutrition
What the researchers found
The review synthesizes current understanding across several areas:
- Collagen structure varies with source and season, affecting extraction conditions and applications
- Fish collagen and gelatin are gaining interest as alternatives to mammalian sources due to safety (BSE/prion concerns) and religious considerations
- Collagen-derived peptides generated through hydrolysis have demonstrated bioactivities in both in vitro and in vivo models
- Beyond nutritional value, collagen peptides may exert biological effects on extracellular matrix cells through food-derived peptides after ingestion
- Applications span food, pharmaceutical, cosmetic, and biomedical industries
- Novel applications continue to emerge for collagen and gelatin products
Why it matters
The collagen supplement market has grown enormously, but scientific understanding of how collagen peptides actually work in the body is still evolving. This review provides the scientific basis for understanding collagen-derived peptide bioactivity — helping consumers and healthcare providers make informed decisions about these popular supplements.
How the study worked
Comprehensive narrative review published in Annual Review of Food Science and Technology, synthesizing research on collagen structure (using various modern analytical technologies), bioactivities, biological effects, and applications of collagen, gelatin, and gelatin hydrolysates.
What this study cannot tell us
As a review, findings depend on the quality of underlying studies. Many bioactivity claims are based on in vitro or animal studies, not human clinical trials. Optimal peptide sizes, doses, and specific mechanisms of action in humans are not definitively established. The diversity of collagen sources and processing methods makes standardization difficult.
How to read the evidence
This is a comprehensive review in a top food science journal synthesizing diverse research. The underlying evidence ranges from strong (structural characterization) to preliminary (many bioactivity claims based on preclinical data only).
When this study was published
Published in 2015 in the Annual Review of Food Science and Technology, this review predates the recent explosion of collagen supplement popularity but provides foundational scientific context that remains relevant.
The bigger picture
Collagen peptides sit at the intersection of food science and biomedical applications. As the market for collagen supplements exceeds $10 billion globally, understanding the scientific evidence for their bioactivity becomes increasingly important. This review captures the transition from collagen as a simple food ingredient to a recognized source of bioactive peptides.
Questions still open
- Which specific collagen-derived peptides are most bioactive, and at what doses do they work in humans?
- Does the source of collagen (fish vs. bovine vs. porcine) meaningfully affect the bioactivity of resulting peptides?
- Can collagen peptides be designed or selected for specific therapeutic applications?
Common questions
Do collagen supplements actually do anything?
Is fish collagen better than bovine collagen?
Read the original research
Collagen and gelatin.
Annual review of food science and technology, 6, 527-57
Citation
Liu, Dasong; Nikoo, Mehdi; Boran, Gökhan; Zhou, Peng; Regenstein, Joe M. (2015). Collagen and gelatin.. Annual review of food science and technology, 6, 527-57. https://doi.org/10.1146/annurev-food-031414-111800