January 2013 in “Liaoning Zhongyiyao Daxue xuebao” Fresh ginger promotes hair growth in mice.
September 2012 in “British Small Animal Veterinary Association eBooks” The document concludes that pigmentation disorders in animals involve complex interactions between melanocytes and keratinocytes.
April 2012 in “J. Willard Marriott Library” Cannabinoids like THC and THCA get into hair through skin oils, not hair color.
Ethnic differences in skin and hair affect penetration minimally, but cultural habits matter in product development.
November 2011 in “Journal of Investigative Dermatology” TRH in hair follicles can influence hair color by increasing melanin.
Prunus Tomentosa extract is effective in promoting hair growth, similar to minoxidil.
January 2010 in “Chinese Journal of Aesthetic Medicine” Melasma skin has more melanin and signs of aging, with strong CK10 expression linked to cell differentiation and aging.
January 2010 in “Pharmacy Today” Collagen reduces skin melanin, boosts antioxidants, and improves skin moisture.
March 2009 in “Chinese Journal of Dermatology” Melanocytes in the outer root sheath are likely stem cells that grow fast but stay immature.
March 2007 in “International Journal of Cosmetic Science” Hair with more melanin resists weather damage better.