Chung, J.H., Seo, J.Y., Choi, H.R., Lee, M.K., Youn, C.S. & Rhie, G. Modulation of skin collagen metabolism in aged and photoaged human skin in vivo. J Invest Dermatol. 2001; 117:1218–1224 Postlethwaite, A.E., Seyer, J.M., and Kang, A.H. Chemotactic attraction of human fibroblasts to type I, II, and II collagens and collagen-derived peptides. Proceedings of the National Academy of Sciences of the United States of America. 1978; 75(2): 871-875.

Currently, health authorities haven’t provided any official guidelines regarding how much collagen to take per day. Scala, J., Hollies, N.R.S. & Sucher, K.P. Effect of daily gelatine ingestion on human scalp hair. Nut Rep Int. 1976; 13(6):579–592Purba, M.B., Kouris-Blazos, A. & Wattanapenpaiboon, N. Skin wrinkling: can food make a difference? J Am Coll Nutr. 2001; 20:71-80. Bruyère, O., Zegels, B., Leonori, L., Rabenda, V., Janssen, A., Bourges, C. & Reginster, J.Y. Effect of collagen hydrolysate in articular pain: a 6-month randomized, double-blind, placebo controlled study. Complement Ther Med. 2012; 20(3):124-30. Sales-Campos, H., Souza, P.R., Peghini, B.C., da Silva, J.S. & Cardoso, C.R. An overview of the modulatory effects of oleic acid in health and disease. Mini Rev Med Chem. 2013; 13(2):201-10.

Peterkofsky, B. Ascorbate requirement for hydroxylation and secretion of procollagen: relationship to inhibition of collagen synthesis in scurvy. Am J Clin Nutr. 1991; 54:1135S-1140S.Dairy, soy, gluten, lactose, bovine products, sesame seeds, genetically modified (GMO) ingredients, nuts, added sugar, artificial colours or artificial flavours. Bianchi FM, Angelinetta C, Rizzi G, et al. Evaluation of the efficacy of a hydrolyzed collagen supplement for improving skin moisturization, smoothness, and wrinkles. J Clin Aesthet Dermatol. 2022;15(3):48-52.

Choi, S.Y., Kim, W.G., Ko, E.J., Lee, Y.H., Kim, B.G., Shin, H.J., Choi, Y.S., Ahn, J.Y., Kim, B.J. & Lee, H.J. Effect of high advanced-collagen tripeptide on wound healing and skin recovery after fractional photothermolysis treatment. Clin Exp Dermatol. 2014; 39(8):874-80.Phillips, C.L., Combs, S.B. & Pinnell, S.R. Effects of ascorbic acid on proliferation and collagen synthesis in relation to the donor age of human dermal fibroblasts. J Invest Dermatol. 1994; 103:228-232. Lupu M-H, Pircalabioru GG, Chifiriuc M-C, et al. Beneficial effects of food supplements based on hydrolyzed collagen for skin care (Review). Exp Ther Med. 2019 Dec;20(1):12-17. doi:10.3892/etm.2019.8342.