6 citations
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May 2003 in “PubMed” Small amounts of DNA can be found in the hair shaft, especially near the root, but it decreases with hair treatments and washing.
Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
99 citations
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June 2005 in “Journal of Cosmetic Dermatology” Hair ages due to genetics and environmental factors, leading to graying and thinning, with treatments available for some conditions.
21 citations
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July 2002 in “Clinical and Experimental Dermatology” Hair care products don't cause hair loss if used correctly.
September 2024 in “Journal of Clinical Medicine” Permanent makeup can cause delayed allergic reactions, but they can be managed with proper treatment.