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Background: A healthy skin provides protection against intrinsic and extrinsic factors. Skin aging is characterized by structural and morphological alterations affecting skin health, integrity, and functionality, resulting in visible aging signs. Aim: The primary objective of this study was to assess the effect of a collagen peptide dietary supplement on skin aging in the East Asian population. Methods: Eighty‐five healthy women, aged from 43 to 65 years old, were randomly assigned to the collagen supplement (CP, 5 g) or placebo (maltodextrin, 5 g) group. To standardize daily skin care, the volunteers in both groups used a specific face cream for 28 days prior to and throughout the supplementation period, creating an equal baseline for the assessment of the efficacy of CP on several skin parameters. At baseline, day 28 and day 84, the following hallmarks of skin and nail aging were assessed: dermis density, skin moisture and elasticity, wrinkle visibility, beauty perception, and nail color. Results: After 84 days, a significant improvement of dermis density and skin moisture was observed in the collagen peptides group compared to the placebo group. Positive effects on skin elasticity, wrinkle visibility, nail color, and overall beauty perception were already observed within 28 days of supplementation in the CP group, while the same effects in the placebo group were only observed after 84 days. Conclusion: Taken together, these results show that, in addition to a standardized skin care, daily supplementation with 5 g of collagen peptides positively affects visible signs of skin and nail aging in the East Asian population. [ABSTRACT FROM AUTHOR]

[Display omitted] • Collagen peptides prolong the human hair follicle growth phase ex vivo. • Collagen peptides maintain hair follicle stem cell quiescence ex vivo. • Collagen peptides preserve the populations of human hair follicle stem cells and their progeny ex vivo. • Supplementation with collagen peptides has the potential to support hair growth and healthy hair. Dietary supplementation with bioactive collagen peptides (CPs) may be a helpful adjuvant strategy in reducing the excessive hair shedding and thinning associated with aging or patterned hair loss. However, the underlying biological effects of CPs on hair follicle (HF) function have not yet been characterized. Excessive hair loss occurs when HFs exit the growth phase (anagen) prematurely due to, among other factors, impaired epithelial HF stem cell (eHFSC) activities. The aims of this study were to investigate the response of human HFs to peptides from the two most popular CP sources, i.e. marine and bovine collagens, which were previously in vitro -digested to mimic gastrointestinal breakdown, in one of the most clinically-relevant ex vivo HF models. Both types of collagens reduced the proliferation of pluripotent K15+ eHFSCs and enhanced the generation of K19+ and/or CD34+ stem cell progenies. In addition, bovine CPs significantly increased K15+ cells in the bulge and marine CPs significantly maintained HFs longer in anagen. Our results suggest that both marine and bovine CPs may help to prevent hair loss and maintain healthy hair by preserving eHFSCs and/or improving the generation of SC progenies. This data invites the further exploration of other CPs for the prevention of excessive hair shedding. [ABSTRACT FROM AUTHOR]

Background Skin dryness and an accelerated fragmentation of the collagen network in the dermis are hallmarks of skin aging. Nutrition is a key factor influencing skin health and consequently its appearance. A wide range of dietary supplements is offered to improve skin health. Collagen peptides are used as a bioactive ingredient in nutricosmetic products and have been shown in preclinical studies to improve skin barrier function, to induce the synthesis of collagen and hyaluronic acid, and to promote fibroblast growth and migration. Our aim was to investigate the effect of oral supplementation with specific collagen peptides on skin hydration and the dermal collagen network in a clinical setting. Methods Two placebo-controlled clinical trials were run to assess the effect of a daily oral supplementation with collagen peptides on skin hydration by corneometry, on collagen density by high-resolution ultrasound and on collagen fragmentation by reflectance confocal microscopy. Human skin explants were used to study extracellular matrix components in the presence of collagen peptides ex vivo. Results Oral collagen peptide supplementation significantly increased skin hydration after 8 weeks of intake. The collagen density in the dermis significantly increased and the fragmentation of the dermal collagen network significantly decreased already after 4 weeks of supplementation. Both effects persisted after 12 weeks. Ex vivo experiments demonstrated that collagen peptides induce collagen as well as glycosaminoglycan production, offering a mechanistic explanation for the observed clinical effects. Conclusion The oral supplementation with collagen peptides is efficacious to improve hallmarks of skin aging. [ABSTRACT FROM AUTHOR]