What are the benefits of collagen? Our expert looked at 5

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2. Bischof K, Moitzi AM, Stafilidis S, König D. Impact of Collagen Peptide Supplementation in Combination with Long-Term Physical Training on Strength, Musculotendinous Remodeling, Functional Recovery, and Body Composition in Healthy Adults: A Systematic Review with Meta-analysis. Sports Med. 2024;54(11):2865-88.

3. Martínez-Puig D, Costa-Larrión E, Rubio-Rodríguez N, Gálvez-Martín P. Collagen Supplementation for Joint Health: The Link between Composition and Scientific Knowledge. Nutrients. 2023;15(6).

4. Naomi R, Ridzuan PM, Bahari H. Current Insights into Collagen Type I. Polymers (Basel). 2021;13(16).

5. Shoulders MD, Raines RT. Collagen structure and stability. Annu Rev Biochem. 2009;78:929-58.

6. Jerger S, Centner C, Lauber B, Seynnes O, Friedrich T, Lolli D, et al. Specific collagen peptides increase adaptions of patellar tendon morphology following 14-weeks of high-load resistance training: A randomized-controlled trial. Eur J Sport Sci. 2023;23(12):2329-39.

7. Schön C, Knaub K, Alt W, Durkee S, Saiyed Z, Juturu V. UC-II Undenatured Type II Collagen for Knee Joint Flexibility: A Multicenter, Randomized, Double-Blind, Placebo-Controlled Clinical Study. J Integr Complement Med. 2022;28(6):540-8.

8. Lugo JP, Saiyed ZM, Lau FC, Molina JP, Pakdaman MN, Shamie AN, et al. Undenatured type II collagen (UC-II®) for joint support: a randomized, double-blind, placebo-controlled study in healthy volunteers. J Int Soc Sports Nutr. 2013;10(1):48.

9. Juturu V, Knaub K, Schoen C, Alt W, Durkee S, Saiyed Z. Journal of Clinical Trials UC-II ® Undenatured Type II Collagen Reduces Knee Joint Discomfort and Improves Mobility in Healthy Subjects: A Randomized, Double- Blind, Placebo-Controlled Clinical Study. 2022.

10. König D, Oesser S, Scharla S, Zdzieblik D, Gollhofer A. Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Women-A Randomized Controlled Study. Nutrients. 2018;10(1).

11. Jendricke P, Centner C, Zdzieblik D, Gollhofer A, König D. Specific Collagen Peptides in Combination with Resistance Training Improve Body Composition and Regional Muscle Strength in Premenopausal Women: A Randomized Controlled Trial. Nutrients. 2019;11(4).

12. Clifford T, Ventress M, Allerton DM, Stansfield S, Tang JCY, Fraser WD, et al. The effects of collagen peptides on muscle damage, inflammation and bone turnover following exercise: a randomized, controlled trial. Amino Acids. 2019;51(4):691-704.

13. Zdzieblik D, Jendricke P, Oesser S, Gollhofer A, König D. The Influence of Specific Bioactive Collagen Peptides on Body Composition and Muscle Strength in Middle-Aged, Untrained Men: A Randomized Controlled Trial. Int J Environ Res Public Health. 2021;18(9).

14. Tak YJ, Kim YJ, Lee JG, Yi YH, Cho YH, Kang GH, et al. Effect of Oral Ingestion of Low-Molecular Collagen Peptides Derived from Skate (Raja Kenojei) Skin on Body Fat in Overweight Adults: A Randomized, Double-Blind, Placebo-Controlled Trial. Mar Drugs. 2019;17(3).

15. Proksch E, Zdzieblik D, Oesser S. The Oral Intake of Specific Bovine-Derived Bioactive Collagen Peptides Has a Stimulatory Effect on Dermal Matrix Synthesis and Improves Various Clinical Skin Parameters. Cosmetics. 2025;12(2):79.

16. Carrillo-Norte JA, García-Mir B, Quintana L, Buracchio B, Guerrero-Bonmatty R. Anti-Aging Effects of Low-Molecular-Weight Collagen Peptide Supplementation on Facial Wrinkles and Skin Hydration: Outcomes from a Six-Week Randomized, Double-Blind, Placebo-Controlled Trial. Cosmetics. 2024;11(4):137.

17. Dewi DAR, Arimuko A, Norawati L, Yenny SW, Setiasih NL, Perdiyana A, et al. Exploring the Impact of Hydrolyzed Collagen Oral Supplementation on Skin Rejuvenation: A Systematic Review and Meta-Analysis. Cureus. 2023;15(12):e50231.

18. Kim J, Lee SG, Lee J, Choi S, Suk J, Lee JH, et al. Oral Supplementation of Low-Molecular-Weight Collagen Peptides Reduces Skin Wrinkles and Improves Biophysical Properties of Skin: A Randomized, Double-Blinded, Placebo-Controlled Study. J Med Food. 2022;25(12):1146-54.

19. Koizumi S, Inoue N, Shimizu M, Kwon C-j, Kim H-y, Park KS. Effects of Dietary Supplementation with Fish Scales-Derived Collagen Peptides on Skin Parameters and Condition: A Randomized, Placebo-Controlled, Double-Blind Study. International Journal of Peptide Research and Therapeutics. 2018;24(3):397-402.

20. Pu SY, Huang YL, Pu CM, Kang YN, Hoang KD, Chen KH, et al. Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients. 2023;15(9).

21. Seong SH, Lee YI, Lee J, Choi S, Kim IA, Suk J, et al. Low-molecular-weight collagen peptides supplement promotes a healthy skin: A randomized, double-blinded, placebo-controlled study. J Cosmet Dermatol. 2024;23(2):554-62.

22. Lee JS, Yoon YC, Kim JM, Kim YH, Kang YH, Shin YC. Liquid collagen from freshwater fish skin ameliorates hydration, roughness and elasticity in photo-aged skin: a randomized, controlled, clinical study. Nutr Res Pract. 2024;18(3):357-71.

23. Sugihara F, Inoue N, Wang X. Clinical effects of ingesting collagen hydrolysate on facial skin properties: -A randomized, placebo-controlled, double-blind trial. Japanese Pharmacology and Therapeutics. 2015;43:67-70.

24. Myung SK, Park Y. Effects of Collagen Supplements on Skin Aging: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Am J Med. 2025;138(9):1264-77.