May 2026 in “International Journal of Health Management Review” This study found that the use of high pH chemical agents for hair straightening can cause significant damage to hair, including protein degradation and weakened fiber strength, and may lead to permanent scalp conditions like contact dermatitis and cicatricial alopecia.
This study evaluated the therapeutic response of an Afro-descendant patient with non-scarring alopecia after prolonged use of alkaline straighteners and mechanical traction, highlighting the susceptibility of Afro hair to chemical and mechanical damage due to its structure.
August 2023 in “Vittalle” This integrative literature review investigated clinical trials on using medicinal plants, herbal products, and dietary supplements for treating alopecia, noting a need for further studies due to limited chemical-pharmaceutical analyses of the plant species involved, which include Allium sativum and Rosmarinus officinalis.
January 2012 in “Surgical & Cosmetic Dermatology” This study found that a dietary supplement improved hair strength and shine in participants with hair damage from breakage.
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June 2022 in “Revista de la Asociación Colombiana de Dermatología y Cirugía Dermatológica” This review discusses cultural hair care practices for African American scalp health and recommends combining clinical evaluation with cultural knowledge, but reports no new research findings.