Brazilian Keratin Hair Treatment: A Review
June 2013
in “
Journal of cosmetic dermatology
”
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.