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This study found that hydrophobic amino acids from egg white hydrolyzed protein and L-phenylalanine effectively penetrate deep into the human hair fiber, increasing specific contents in both virgin and bleached hair.

Human hair keratin has a 40% α-helix structure that changes to a random coil in 8 M urea.

This study found that keratins have evolutionarily conserved and domain-selectively enriched amino acids, which likely reflect their unique structural roles, with distinct patterns observed among epidermal, hair, and simple-type epithelial keratins.

Hair follicles have unique proteins that vary by species and are influenced by nutrition.

This study suggests that trichohyalin is modified by peptidyl-arginine deiminase before being cross-linked by TGase 3, allowing the formation of rigid structures in hair follicle cells.

This study found that human trichohyalin has a unique protein sequence potentially contributing to at least three important functions in hair follicle and epidermal cells.

This study found that 3-hydroxypropionic acid improved the function of hair follicle cells under oxidative stress, suggesting potential as a treatment for stress-related hair loss.

This study detailed the structure and amino acid composition of sheep trichohyalin, noting its presence in various tissues and suggesting a possible functional role beyond structural support in hair follicles.

This study identified the same N-terminal and C-terminal amino acids in human and horse hair as previously found in wool and feather keratin.

This study found that intermediate filaments and matrix proteins in presumptive hair shaft cells are synthesized sequentially, identifying a new polypeptide component that changes during hair cell differentiation.

PRO-C22 can help diagnose and monitor the severity of hidradenitis suppurativa.

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 research reports that the polyG fragment within the Hoxc13 protein alters its gene regulatory functions, which could have influenced mammalian hair evolution by affecting pathways related to hair follicle development.

This study used proteomic techniques to analyze human hair proteins, revealing keratin heterogeneity and identifying posttranslational modifications, such as cysteine trioxidation and methylation.

This study compared hydrolysed wheat protein, L-arginine, and hydrolysed collagen for their effectiveness in enhancing the tensile strength of heavily bleached hair.

This study found that the stability of the coiled-coil structure in human hair keratin is maintained by ion-pairing and hydrophobic interactions, which are disrupted as pH approaches 7.0.

This article reviews the potential benefits of GHK-Cu, EAA, and water-soluble propolis for wound healing, skin tightening, and anti-aging effects, but reports no new clinical results.

This study purified trichohyalin protein from pig tongue epithelium, characterizing its unique properties and structure, which may facilitate future functional research.

This study found that the penta-peptide Gly-Pro-Ile-Gly-Ser increased the proportion of thick hair and improved baldness appearance in Japanese men with androgenetic alopecia.

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 study suggests that the amino acid composition of fibrous proteins in normal human hair is similar to that of stratum corneum proteins, particularly in cysteine and glycine content.

This study found that keratin and other hair proteins in humans are extensively modified posttranslationally, which helps explain the structural characteristics of mature hair.

This study suggests that human trichohyalin may function as a flexible rod linking keratin intermediate filaments and as a scaffold protein in hair follicle and epidermis cell envelopes.

The hair follicle's connective tissue is a key source of a certain collagen in human scalp skin.