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Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis – PubMed (nih.gov) >>>>> Int J Dermatology. 2021 Dec;60(12):1449-1461.  doi: 10.1111/ijd.15518. Epub 2021 Mar 20.

3.Daily oral supplementation with collagen peptides combined with vitamins and other bioactive compounds improves skin elasticity and has a beneficial effect on joint and general wellbeing
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14. Collagen supplementation for skin health: A mechanistic systematic review

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15. 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

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20. A randomized controlled trial on the efficacy and safety of a food ingredient, collagen hydrolysate, for improving joint comfort. Int J Food Sci Nutr. 2009;60(Suppl 2):99-113.

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21. Generation of bioactive prolyl‐hydroxyproline (Pro‐Hyp) by oral administration of collagen hydrolysate and degradation of endogenous collagen – Sato – 2019 – International Journal of Food Science & Technology – Wiley Online Library

 

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