8 citations
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January 2013 in “Annals of Dermatology” Korean women dye their gray hair more than men, and it doesn't cause scalp diseases.
April 2026 in “Cosmetics” The shampoo effectively covers gray hair gradually and maintains color after multiple washes.
19 citations
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January 2012 in “Annals of Dermatology” People need more information about hair dye ingredients and side effects.
1 citations
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June 2023 in “Skin Research and Technology” Hair-coating shampoos dye better initially, but hair-oxidation shampoos keep color longer and may damage hair more.
63 citations
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February 2017 in “ACS biomaterials science & engineering” Polydopamine is a safe, effective, and permanent hair dye that turns gray hair black in one hour.