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April 2000 in “Journal of histochemistry and cytochemistry/The journal of histochemistry and cytochemistry” ICAM-1 helps regulate hair growth cycles and skin remodeling.
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July 2008 in “Developmental Biology” Smad4 is important for healthy hair follicles because it helps produce a protein needed for hair to stick together and grow.
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July 2022 in “Nutrients” Vitamin A is important for healthy skin and hair, influencing hair growth and skin healing, but UV light reduces its levels.