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November 2015 in “Pharmaceutical Development and Technology” Propylene glycol and ethanol increase finasteride skin absorption, sodium lauryl sulfate doesn't.
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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.
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November 2017 in “Journal of Cosmetic Dermatology” Certain polymers can stick to hair and increase volume, working best at a pH of 7 to 9.
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June 2016 in “PubMed” Repeated dyeing and shampooing cause hair color loss and damage.
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October 2022 in “Veterinary pathology” Some canine hair follicle tumors contain amyloid deposits, with a protein called CK5 involved in their formation.