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This study observed that hydrophobic modifications of hair matrix proteins significantly alter the humidity-dependent glass transition temperature of human hair.

This review discusses the history, structure, and biological significance of keratins, including the crystal structure of a keratin helical segment, without reporting new experimental results.

In this study, the researchers reported that a newly developed PYGL inhibitor, HTPI, enhanced hair growth in an ex-vivo culture by reducing oxidative damage in hDPCs and inhibiting glycogen degradation in hORSCs, showing potential as a treatment for hair loss comparable to minoxidil.

This study found that orally administered hydrolyzed keratin peptide promoted hair growth and enhanced cellular proliferation and antioxidant capacity in mice and human cell models, suggesting its potential as a functional food ingredient for hair health.

Panthenol is more effective than hydrolyzed protein at improving hair roughness and reducing breakage.

This study identified a novel keratin-associated protein, KAP24.1, which is specifically expressed in the human scalp and located in the hair cuticle.

This study identified a human sequence likely coding for a new ultra-high sulphur protein, which may aid in understanding hair differentiation and the molecular basis of human trichothiodystrophy.

This study found that a hair conditioner using peptides from Pneumatophorus japonicus heads improved damaged hair's structure, gloss, and smoothness more effectively than a commercial wheat protein conditioner by increasing amino acid content and interacting with hair keratin.

This study found that genes encoding mouse high-glycine/tyrosine proteins show distinct spatial and temporal expression patterns in hair follicles, suggesting diverse protein distribution during hair growth cycles.

This study found that although progerin expression in mouse skin causes significant nuclear shape changes in keratinocytes, it does not result in alopecia or common skin abnormalities seen in human Hutchinson–Gilford progeria syndrome.

This study found that a food supplement improved skin moisturization, elasticity, and thickness, reduced telogen hair density, and enhanced nail status in women with mild-to-moderate aging signs after 84 days.

This study found that improved protein extraction methods enhanced the resolution of hair proteins on gels, but differences in protein abundance between curly and straight Japanese women’s hair were minimal and unlikely to affect hair structure.

This study found that intradermal injections of Profhilo® significantly reduced skin inflammation and pain, while altering spinal cord markers in mice with ovalbumin-induced atopic dermatitis, suggesting potential therapeutic benefits for inflammatory skin conditions involving both peripheral and central processes.

This study found that a peptide treatment using Protein disulphide isomerase improved the mechanical and thermal properties of over-bleached hair by promoting deeper peptide penetration and attachment.

This review details the development of the alpha-helix model for protein structure proposed by Pauling and Corey and confirms its validity through X-ray studies of myoglobin and lysozyme.

In this study, researchers localized arginine and citrulline in rat hair follicles and found that arginine is abundant in trichohyalin droplets, while citrulline predominantly accumulates in the hardened inner sheath and medulla.

This study found that the mammalian Hr protein can interact with the p53 pathway by binding to a specific p53 response element, influencing the regulation of genes involved in cell cycle control.

This study introduced a method to isolate and separate microfibrillar proteins from human hair, identifying previously undetected glycine- and tyrosine-rich proteins.

The new anti-aging ingredient improves skin hydration, elasticity, and reduces wrinkles.

This study documents that trichohyalin acts as a multi-functional cross-bridging protein in the inner root sheath of mouse hair follicles, enhancing mechanical strength by linking keratin filaments to the cell envelope.

This study discusses the effects of incorporating various amino acids in hair care products, noting improvements in hair surface properties and color retention when integrated with conditioners.

In this study, HYDRO DELUXE BIO was reported to show promise for scalp mesotherapy by enhancing angiogenesis and reducing inflammation in an in vitro model.

This study found that N‐AOHPA was particularly effective as a silicone emulsifier for improving the condition of damaged hair by preventing amino acid dissolution from bleached hair.

In this report, researchers observed that a single treatment using a combination of hyperdiluted calcium hydroxylapatite, platelet-rich plasma, and hyaluronidase improved neck wrinkles and skin laxity in two patients, indicating preliminary evidence for the safety and efficacy of this novel therapy.