Hair keratin treatments can be harmful, potentially causing health issues like skin reactions and cancer.
February 2025 in “International Journal of Cosmetic Science” A new amino acid derivative, ATS, improves hair texture and moisture, making it easier to straighten curly hair.
40 citations
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June 2013 in “Journal of cosmetic dermatology” Brazilian keratin treatments can straighten hair but may contain harmful formaldehyde.
2 citations
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January 2022 in “Anais brasileiros de dermatologia/Anais Brasileiros de Dermatologia” Chemical hair straighteners can cause scalp and hair damage, but long-term effects are unclear.
April 2017 in “Journal of Pharmaceutical Investigation” Indole-based compounds improved ovarian health in rats with PCOS, with L-Tryptophan and Tryptophol being most effective.