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In this study, Tanimura et al. reported that loss of collagen XVII in mice leads to hair loss and pigmentation defects, potentially due to impaired TGF-beta signaling affecting melanocyte stem cell maintenance.

This study found that increasing collagen concentration to 2% in permanent wave treatments reduced hair damage but impaired curl formation.

Equol may help with antiaging and skin health by boosting collagen and blocking certain hormones.

Biotin and collagen may improve hair health.

This study found that a PGE2 matrix, when injected subcutaneously, increased the proportion of developing hair follicles and improved hair follicle stem cell markers in a mouse model of hair loss.

This study found that adding keratin to a collagen hydrogel improved keratinocyte differentiation compared to a pure collagen hydrogel, particularly when calcium was also present in the media.

This study found that α-MSH may suppress IFN-γ-driven upregulation of ICAM-1 in human dermal fibroblasts, suggesting potential roles for melanocortins in inflammatory skin disorders beyond collagen synthesis effects.

This study found that dermal hair papilla and sheath cells have lower collagen secretion than fibroblasts, suggesting different functions, and that routine culture medium supports their optimal growth and proliferation.

In this study, a collagen sponge with isogenic fibroblasts did not enhance skin graft survival or wound healing in rats, but it did promote re-epithelization, potentially inducing epithelial inclusion cysts.

This study found that minoxidil sulfate did not enhance hair follicle growth or cell proliferation in isolated human hair follicles at concentrations of 0.1, 1, and 10 μg/ml.

This study found that the polyurethane-cellulose acetate scaffold containing plasma rich in growth factors enhanced gene expression linked to wound healing compared to controls.

This study found that a polyurethane-cellulose acetate scaffold with plasma rich in growth factors may enhance gene expression related to wound healing in an experimental setting.

In this study, Korean adults with damaged hair who took 3g/day of low-molecular-weight collagen peptide GT for 24 weeks showed significant improvements in hair gloss, elasticity, and scalp elasticity compared to placebo, without any adverse events.

This study reports that combining ergothioneine, collagen peptides, and sodium hyaluronate improved skin parameters like hydration, elasticity, and wrinkle reduction in Chinese women, while ex vivo data indicated enhanced antioxidant action and structural support, suggesting potential for anti-aging nutricosmetics.

In this study, topical applications of Agrimonia pilosa extract and agrimonolide demonstrated notable anti-inflammatory and wound healing benefits in animal models, significantly reducing inflammation and enhancing wound closure compared to controls. However, further research in humans is needed to confirm these preclinical findings.

This study found that Hydroxypinacolone Retinoate (HPR) may alleviate UV-induced skin photoaging by enhancing collagen synthesis, reducing degradation, and modulating inflammatory and oxidative responses in a dose-dependent manner.

This review highlights that collagen XVIIα1's role in maintaining dermal-epidermal junction integrity and hair follicle stem cell maintenance is compromised with age due to reduced levels and increased processing, potentially affecting skin and hair aging.

This review reports that collagen as a nutraceutical shows promising results for improving skin health in estrogen-deficient women, but more research is needed for scalp hair, nail health, and optimal dosing of curcumin and glutathione.

This study found that Grateloupia angusta extract improved wound healing by promoting matrix production and pro-angiogenic activity in cell cultures and enhanced early wound repair in a mouse skin incision model.

This narrative review concluded that facial aging involves complex anatomical changes that require multimodal rejuvenation approaches, integrating fillers, collagen stimulators, botulinum toxin, and energy-based devices for effective results, while emphasizing the need for scientific evidence and patient safety in aesthetic treatments.

In this study, adults with mild-to-moderate hair damage taking GPVGPS Collagen® daily for 24 weeks showed significant improvements in hair luster, strength, thickness, and density compared to placebo, with no safety concerns reported.

In this study, researchers explored ubiquitination patterns in healthy human skin and CYLD cutaneous syndrome tumors, identifying extensive ubiquitin sites and differential protein ubiquitination linked to tumor pathology, highlighting the role of ubiquitination in tissue architecture and disease mechanisms.

This study demonstrated that an aloe polysaccharide-collagen wound dressing improved wound healing by enhancing angiogenesis and reducing inflammation in vivo.

This study suggests that low molecular weight fish collagen peptide may promote hair follicle growth and regeneration, improving overall hair quality in mouse models.

This study found that Limelight (CB-EVs) exosomes significantly promoted hair elongation ex vivo without cytotoxicity, suggesting potential as a safe and effective hair growth therapy.

This review found that hydrolyzed collagen supplementation, particularly marine collagen, improves skin hydration, elasticity, and density while strengthening hair and nails, especially when paired with vitamin C and trace elements; however, more studies are necessary to evaluate long-term efficacy across different sources and demographics.

This study observed that both in vitro and in vivo research demonstrated rice bran extract can significantly enhance collagen and elastin synthesis, reduce water loss, and improve skin quality and elasticity, highlighting its potential as a sustainable cosmetic ingredient.

In this study, researchers conducted additional IHC staining on equine skin sections and found that collagen type III primarily labels the extracellular matrix, while anti-PDGFR-antibody staining highlights cells with long-shaped processes mainly arranged around hair follicles.

In a rodent study, researchers found that oral phenytoin and spironolactone significantly mitigated 5-fluorouracil-induced hair loss and oxidative stress, suggesting potential therapeutic benefits for chemotherapy-induced alopecia and enhanced recovery.

In this study, researchers developed non-invasive methods to monitor hair shaft, melanin, and collagen dynamics in C57BL/6 mice across different hair follicle cycle phases, supporting non-invasive research in hair loss treatment development.