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This article reviews how aging affects skin and stem cells, but it contains no new research findings.

This study found that a single X-radiation treatment in rat skin reduced collagen concentration over multiple hair-cycles by diminishing the fibroblasts' capacity for proline hydroxylation, potentially contributing to delayed skin lesions.

This randomized, double-blind, placebo-controlled study found that a supplement containing hydrolysed collagen and vitamin C (Absolute Collagen) improved skin, scalp, and hair over 12 weeks when taken daily or every other day.

This study suggests that collagen XVIII and its variant endostatin may play a role in regulating Wnt-signaling in hair follicles, affecting wound healing and skeletal development in mice.

In this study, researchers suggest that strategic early intervention during fetal wound healing could lead to significantly improved long-term skin regeneration outcomes.

This review discusses the role of collagen XVII in maintaining stem cell niches and its impact on skin aging and wound repair, without reporting new clinical results.

This study observed that 67 kDa keratin was expressed homogeneously only in epidermis derived from hair follicle explants, differing from other culture methods where expression was delayed and patchy.

In this study, collagen scaffolds functionalized with heparin and growth factors significantly enhanced long-term skin regeneration and growth in a sheep model of fetal skin defect, suggesting potential for prenatal spina bifida treatment.

In this study, PTH–CBD displayed dose-dependent effects in reducing hair loss and enhancing hair regrowth in a mouse model of chemotherapy-induced alopecia.

This study observed that Fraser’s dolphins exhibit remarkable skin healing abilities, with type I collagen prevalent in normal skin and type III collagen emerging during early wound healing before returning to normal configuration, suggesting insights for human clinical wound management.

Collagen XVIII is crucial for maintaining tissue structure and function in the brain, kidneys, and hair.

This study found that fish scale collagen peptide significantly promoted wound healing in mice, with the <1 kDa fractions enhancing collagen synthesis and reducing inflammation, suggesting potential clinical benefits.

This study introduces a method for determining the orientation of collagen fibers in skin by analyzing the anisotropic shape of hair pores, which may aid in skin grafting procedures.

This study successfully developed a method to culture human hair follicle cells without a biological feeder layer, maintaining cell differentiation for a month.

This study observed that cutaneous microwounds created by fractional photothermolysis heal differently from typical wounds, displaying rapid re-epithelialization and limited inflammation, which may help reduce scar formation by delaying collagen remodeling and minimizing myofibroblast activation.

This study found that incorporating collagenase type I into a noncultured hair follicle cell suspension technique improved cell yield and enhanced repigmentation in patients with stable vitiligo compared to dermabrasion alone.

In this study, collagen I decellularized scaffolds enhanced the growth and melanotic properties of hair follicle melanocytes, suggesting their potential as effective carriers for transplantation in vitiligo treatment.

This study found that a nutritional supplement containing peptides, lipids, hyaluronic acid, and collagen improved skin, hair, and nail dryness, with significant benefits noted for those with severe symptoms.

This review discusses the use of microneedling with a dermaroller for treating acne scars, hair loss, and wrinkles, and reports no new clinical results.

In this study, researchers observed that hidradenitis suppurativa lesions were associated with reduced collagen and elastin, and increased neovascularization in areas with chronic inflammation.

Among young rats, this study found that a liquid protein diet significantly affects body condition but has minimal impact on gingival collagen metabolism.

This study found that CTHRC1 is crucial for sweat gland function and vascular network integrity in mice, and its administration improved sweat gland performance by reconstructing nearby blood vessels.

This study found that using insulin-like growth factor 1 with bone marrow-derived mesenchymal stem cells in a collagen-chitosan scaffold enhanced wound healing and hair follicle regeneration in rats.

This study reported that novel adipose slurry injections improved rhytides and dermis density in patients receiving facial wrinkle treatments based on evaluations at multiple follow-up intervals.

Collagen XVIII and Bmx tyrosine kinase are important for hair growth and skin cancer development.

This study observed that the lower part of vibrissa hair roots in adult Wistar rats receives a richer blood supply and structural protection, compared to the upper part.

This study demonstrated that plucked human hair follicles cultured in a collagen gel matrix developed spike-like structures, suggesting a useful method to study outer root sheath cell growth and differentiation in vitro.

This study investigated various animal tissues from adult mice and embryonic chicks, finding that tissue stiffness follows a sub-linear power law relationship with Collagen-I levels, consistent with cellularized collagen gels but not acellular ones.

This study observed that applying a pulling force to hair follicles led to significant compression of nuclei in certain cell layers and distinct collagen changes at different follicle depths.

This study found that combined intake of enzyme food and collagen was more effective than either alone in improving scalp hair properties in middle-aged women.