40 citations
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June 2013 in “Journal of cosmetic dermatology” This review discusses the widespread use of Brazilian keratin treatments and notes that many contain formaldehyde, marketed as safe despite potential safety concerns, but reports no new clinical results.
14 citations
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January 2015 in “Skin Appendage Disorders” This study examined severe skin reactions, including erythema and eczema-like lesions, associated with Brazilian keratin treatment, suggesting a drug reaction phenomenon rather than solely irritant or allergic origin.
2 citations
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May 2022 in “International Journal of Trichology” This study identified 43 patients with psoriasiform skin reactions associated with Brazilian Keratin Treatment, suggesting this adverse effect may be underdiagnosed and important to recognize through clinical and dermatoscopic features.
In this summary, the researchers describe the Brazilian keratin treatment as a popular hair-straightening process that originated in Brazil in 2003 and has since gained global traction, particularly for smoothing and straightening curly or frizzy hair through a keratin-based product and heat application.
This review discusses the potential risks of formaldehyde in hair keratin treatments like Brazilian blow-dry, and reports no new clinical results; it emphasizes the need for greater safety assessments including occupational exposure.