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Oliviero F, Ramonda R, Hoxha A, et al. Effect of an oral preparation containing hyaluronic acid, chondroitin sulfate, hydrolyzed collagen type II and hydrolyzed keratin on synovial fluid features and clinical indices in knee osteoarthritis. A pilot study. Reumatismo. 2020;72(3):125-130. View abstract.

Lin P, Alexander RA, Liang CH, et al. Collagen formula with Djulis for improvement of skin hydration, brightness, texture, crow's feet, and collagen content: A double-blind, randomized, placebo-controlled trial. J Cosmet Dermatol. 2021;20(1):188-194. View abstract.

Sangsuwan W, Asawanonda P. Four-weeks daily intake of oral collagen hydrolysate results in improved skin elasticity, especially in sun-exposed areas: a randomized, double-blind, placebo-controlled trial. J Dermatolog Treat. 2020:1-6. View abstract.

Prowting JL, Bemben D, Black CD, Day EA, Campbell JA. Effects of collagen peptides on recovery following eccentric exercise in resistance-trained males-A pilot study. Int J Sport Nutr Exerc Metab. 2020:1-8. View abstract.

Moskowitz RW. Role of collagen hydrolysate in bone and joint disease. Semin Arthritis Rheum. 2000;30(2):87-99. View abstract.

Zdzieblik D, Oesser S, König D. Specific Bioactive Collagen Peptides in Osteopenia and Osteoporosis: Long-Term Observation in Postmenopausal Women. J Bone Metab 2021;28(3):207-213. View abstract.

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Zdzieblik D, Brame J, Oesser S, Gollhofer A, König D. The Influence of Specific Bioactive Collagen Peptides on Knee Joint Discomfort in Young Physically Active Adults: A Randomized Controlled Trial. Nutrients 2021;13(2):523. View abstract.

Mohammed A, He S. A Double-Blind, Randomized, Placebo-Controlled Trial to Evaluate the Efficacy of a Hydrolyzed Chicken Collagen Type II Supplement in Alleviating Joint Discomfort. Nutrients 2021;13(7):2454. View abstract.

Lis DM, Jordan M, Lipuma T, Smith T, Schaal K, Baar K. Collagen and Vitamin C Supplementation Increases Lower Limb Rate of Force Development. Int J Sport Nutr Exerc Metab 2021. View abstract.

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):4837. View abstract.

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Jung K, Kim SH, Joo KM, et al. Oral Intake of Enzymatically Decomposed AP Collagen Peptides Improves Skin Moisture and Ceramide and Natural Moisturizing Factor Contents in the Stratum Corneum. Nutrients 2021;13(12):4372. View abstract.

Miyanaga M, Uchiyama T, Motoyama A, Ochiai N, Ueda O, Ogo M. Oral Supplementation of Collagen Peptides Improves Skin Hydration by Increasing the Natural Moisturizing Factor Content in the Stratum Corneum: A Randomized, Double-Blind, Placebo-Controlled Clinical Trial. Skin Pharmacol Physiol 2021;34(3):115-127. View abstract.

Maia Campos PMBG, Melo MO, Siqueira César FC. Topical application and oral supplementation of peptides in the improvement of skin viscoelasticity and density. J Cosmet Dermatol 2019;18(6):1693-1699. View abstract.

Lee YI, Lee SG, Kim J, Choi S, Jung I, Lee JH. Proteoglycan Combined with Hyaluronic Acid and Hydrolyzed Collagen Restores the Skin Barrier in Mild Atopic Dermatitis and Dry, Eczema-Prone Skin: A Pilot Study. Int J Mol Sci 2021;22(19):10189. View abstract.

Taylor G, Leonard A, Tang JCY, et al. The effects of collagen peptides on exercise-induced gastrointestinal stress: a randomized, controlled trial. Eur J Nutr 2023;62(2):1027-1039. View abstract.

Jockel-Schneider Y, Stoelzel P, Hess J, Haubitz I, Fickl S, Schlagenhauf U. Impact of a Specific Collagen Peptide Food Supplement on Periodontal Inflammation in Aftercare Patients-A Randomised Controlled Trial. Nutrients 2022;14(21):4473. View abstract.

Alipoor E, Jazayeri S, Dahmardehei M, et al. Effect of a collagen-enriched beverage with or without omega-3 fatty acids on wound healing, metabolic biomarkers, and adipokines in patients with major burns. Clin Nutr 2023;42(3):298-308. View abstract.

Balshaw TG, Funnell MP, McDermott E, et al. The effect of specific bioactive collagen peptides on function and muscle remodeling during human resistance training. Acta Physiol (Oxf) 2023;237(2):e13903. View abstract.

Lee J, Bridge JE, Clark DR, Stewart CE, Erskine RM. Collagen supplementation augments changes in patellar tendon properties in female soccer players. Front Physiol 2023;14:1089971. View abstract.

Chen CC, Chang SS, Chang CH, et al. Randomized, double-blind, four-arm pilot study on the effects of chicken essence and type II collagen hydrolysate on joint, bone, and muscle functions. Nutr J 2023;22(1):17. View abstract.

Kim J, Lee SG, Lee J, 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):1146-1154. View abstract.

Lee M, Kim E, Ahn H, Son S, Lee H. Oral intake of collagen peptide NS improves hydration, elasticity, desquamation, and wrinkling in human skin: a randomized, double-blinded, placebo-controlled study. Food Funct 2023. View abstract.

Guadanhim LRS, Miot HA, Soares JLM, et al. Efficacy and Safety of Topical or Oral Hydrolyzed Collagen in Women with Dermatoporosis: A Randomized, Double-Blind, Factorial Design Study. Dermatol Ther (Heidelb) 2023;13(2):523-534. View abstract.

Milani M, Colombo F; GFM-O-Trial Investigators Group: Chiara Baraldo (Padova), Mauro Barbareschi (Milano), et al. Efficacy and tolerability of an oral supplement containing amino acids, iron, selenium, and marine hydrolyzed collagen in subjects with hair loss (androgenetic alopecia, AGA or FAGA or telogen effluvium). A prospective, randomized, 3-month, controlled, assessor-blinded study. Skin Res Technol 2023;29(6):e13381. View abstract.

Koizumi S, Okada Y, Miura S, et al. Ingestion of a collagen peptide containing high concentrations of prolyl-hydroxyproline and hydroxyprolyl-glycine reduces advanced glycation end products levels in the skin and subcutaneous blood vessel walls: a randomized, double-blind, placebo-controlled study. Biosci Biotechnol Biochem 2023. View abstract.

Chae M, Moon CY, Lim SH, et al. Oral Ingestion of AP Collagen Peptide Leads to Systemic Absorption of Gly-Pro-Hyp, Alleviating H(2)O(2)-Induced Dermal Fibroblast Aging. J Med Food 2023;26(5):299-306. View abstract.

Kuwaba K, Kusubata M, Taga Y, Igarashi H, Nakazato K, Mizuno K. Dietary collagen peptides alleviate exercise-induced muscle soreness in healthy middle-aged males: a randomized double-blinded crossover clinical trial. J Int Soc Sports Nutr 2023;20(1):2206392. View abstract.

Balshaw TG, Funnell MP, McDermott EJ, et al. The Effect of Specific Bioactive Collagen Peptides on Tendon Remodeling during 15 wk of Lower Body Resistance Training. Med Sci Sports Exerc 2023;55(11):2083-2095. View abstract.

Jerger S, Centner C, Lauber B, 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. View abstract.

Kviatkovsky SA, Hickner RC, Cabre HE, Small SD, Ormsbee MJ. Collagen peptides supplementation improves function, pain, and physical and mental outcomes in active adults. J Int Soc Sports Nutr 2023;20(1):2243252. View abstract.

Lin CR, Tsai SHL, Huang KY, Tsai PA, Chou H, Chang SH. Analgesic efficacy of collagen peptide in knee osteoarthritis: a meta-analysis of randomized controlled trials. J Orthop Surg Res 2023;18(1):694. View abstract.

Pu SY, Huang YL, Pu CM, et al. Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients 2023;15(9):2080. View abstract.

Seong SH, Lee YI, Lee J, et al. Low-molecular-weight collagen peptides supplement promotes a healthy skin: A randomized, double-blinded, placebo-controlled study. J Cosmet Dermatol 2023. View abstract.

Thomas C, Kingshott RN, Allott KM, et al. Collagen peptide supplementation before bedtime reduces sleep fragmentation and improves cognitive function in physically active males with sleep complaints. Eur J Nutr 2023. View abstract.