The Hair Loss Encyclopedia

Brazilian Keratin Hair Treatment: A Review

June 2013 in “ Journal of cosmetic dermatology ”

Courtney Weathersby, Amy Mcmichael

Brazilian keratin treatment formaldehyde keratin

Image of study

TLDR Brazilian keratin treatments can straighten hair but may contain harmful formaldehyde.

Brazilian keratin treatments were popular for straightening hair and claimed to make curly hair more manageable, frizz-free, and shiny. Despite their widespread use and the lack of reported adverse side effects, many of these products contained formaldehyde or its derivatives, raising safety concerns.

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Research cited in this study

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Chemical Danger in Hair Keratin Care

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