62 citations
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December 1966 in “Endocrinology” Injecting α-MSH made mice's hair turn black.
12 citations
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September 2018 in “International Journal of Cosmetic Science” Palmitoyl tetrapeptide-20 may help reduce hair greying and increase melanin production.
64 citations
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June 1992 in “International Journal of Dermatology” Pregnancy often causes skin changes like darkening, stretch marks, and hair growth, which may improve after childbirth.
46 citations
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July 1988 in “Journal of The American Academy of Dermatology” Hormone imbalances can cause specific skin changes, which may help in early detection of endocrine disorders.
12 citations
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January 1981 in “Springer eBooks” Environmental factors like temperature and nutrition affect hair growth, with humans showing seasonal hair growth differences.