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”
           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.  
               7 citations
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  December 2006      Tribulus terrestris extract significantly increases MSH expression and melanin production in mouse hair follicles.  
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  June 1992   in “International Journal of Dermatology”
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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”
           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.