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A natural hair dye from cuttlefish ink and chitosan effectively colors hair black without harmful chemicals.

Dyes can penetrate human skin and hair follicles up to 1.2 mm deep and the sebaceous gland can store dye; Indocyanine Green lotion was made for safe dyeing and monitoring.

Human hair keratin fibers have a detailed nano-scale structure that changes with different conditions.

Innovative cosmetics could safely change hair color by targeting biological hair pigmentation processes.

Nanomaterials can improve hair care products and treatments, including hair loss and alopecia, by enhancing stability and safety, and allowing controlled release of compounds, but their safety in cosmetics needs more understanding.

Dromedary camel hair structure and mineral content change with age.

Certain drugs can change hair color, either lightening or darkening it.

Hair-coating shampoos dye better initially, but hair-oxidation shampoos keep color longer and may damage hair more.

Antigens from skin cells may cause hair loss in perinevoid alopecia.

Fermented grapeseed oil effectively repairs and protects chemically damaged hair.