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What Is a Keratin Hair Treatment?
A keratin hair treatment can be either a salon treatment or an at-home procedure that uses proteins to smooth the hair cuticle and create straighter, shinier hair. The protein keratin is naturally found in human hair, and keratin treatments are aimed at restoring this protein to frizzy, curly or damaged hair. Some controversy surrounds the salon treatments, many of which have been found to contain dangerous levels of the suspected carcinogen formaldehyde. Using an at-home keratin hair treatment generally is safer and less expensive, but it might not last as long or have effects as strong as the salon versions.