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June 2011 in “Journal of applied polymer science” L-phenylalanine and hydrolyzed eggwhite protein deeply penetrate human hair.
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February 2023 in “Colloids and surfaces. B, Biointerfaces” Smaller curcumin nanocrystals penetrate skin better, but additives and particle size affect absorption and accumulation.
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May 2024 in “Journal of biomaterials science. Polymer ed.” The three-layer microneedle system effectively delivers minoxidil into the skin, showing potential as a safe and efficient treatment for hair loss.
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June 2016 in “Magnesium research” Hair follicles help magnesium get through the skin more effectively.
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February 2007 in “Laser Physics Letters” Caffeine shampoo penetrates hair follicles deeply and stays for up to 48 hours.