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research The pH of lye and no-lye hair relaxers, including those advertised for children, is at levels that are corrosive to the skin

12 citations , November 2019 in “South African Medical Journal”

This study found that the pH levels of relaxers tested were corrosive to the skin and may contribute to alopecia in females with afro-textured hair.

research The Effects of the Chemical Relaxer Lye on Hair Cortisol Concentrations

January 2026 in “Psychoneuroendocrinology”

Lye relaxers don't significantly change hair cortisol levels.

research ‘Relaxers’ damage hair: Evidence from amino acid analysis

January 2011 in “Yearbook of Dermatology and Dermatologic Surgery”

Hair relaxers are linked to reduced cystine levels and potential hair damage.

research Cuticular damage to African–American hair during relaxer treatments – A microfluorometric and SEM Study

3 citations , May 2009 in “International Journal of Cosmetic Science”

This study investigated the effects of different relaxer treatments on African-American hair, finding lab-made relaxer solutions caused less damage to hair topography than commercial systems.

research Acute ‘relaxer’-associated scarring alopecia: a report of five cases

29 citations , May 2007 in “British Journal of Dermatology”

This report describes five patients who experienced hair loss with discomfort and scarring after undergoing salon hair relaxer treatments, regardless of whether 'lye' or 'no lye' products were used.

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