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This paper reviews various aspects of hair care products, including formulations, regulations, categories, and safety, without reporting new clinical findings.

In this study, a mechanical model was developed to describe and validate the effectiveness of overnight hair curling, suggesting that combining it with hair fixatives can maintain a desired curl for over a day.

This study found that human hair follicle bulge stem cells exhibited autofluorescence, potentially due to high flavin- and NAD-related compound levels, highlighting the need to consider this when using fluorescent antibodies for studying these cells.

This study used rapid-freezing immunocytochemistry to successfully map the ultrastructural localization of hair keratins in human scalp hair, primarily finding them in macrofibrils in the cortex and endocuticle.

This study discovered that the lipid in human hair follicles is mainly located in the hair cuticle and keratinized inner root sheath, distinct from sebaceous and epidermal lipids, suggesting a potential role as a "hair barrier.