February 2005 in “CRC Press eBooks” Hair color is due to active pigment cells in hair during growth.
28 citations
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November 2018 in “Journal of structural biology” Different populations have distinct hair structures related to their ancestry.
10 citations
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July 2022 in “Dermatology and Therapy” Melasma's causes include genetics, sun exposure, hormones, and oxidative stress, and understanding these can help create better treatments.
April 2012 in “J. Willard Marriott Library” Cannabinoids like THC and THCA get into hair through skin oils, not hair color.
April 1986 in “CRC Press eBooks” Hair color is determined by melanins produced in hair cells.