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A fatty acid/protein complex in human hair helps protect it from damage.

This study found that papain/bisulfite disintegrates human hair cuticles by dissolving the endocuticle, potentially accelerated by ethanol's removal of cell membrane material.

This study found that keratin films made from human hair can potentially substitute for human nail plates in drug permeability studies, but they show higher sensitivity to penetration enhancers compared to bovine hooves.

In this clinical study, a vegan collagen builder (VEGCOL™️) was shown to safely and effectively improve hair growth, skin smoothness, wrinkle reduction, and joint pain relief in adults, with enhancements varying by dose over a 60-day period.

This study optimized the extraction process of bear grease through enzymatic hydrolysis and found that it was rich in unsaturated fatty acids, enhancing its hair growth-promoting properties in mice compared to traditional methods.