Formaldehyde-Free Keratin Real-talk time: There's no such thing as a truly chemical-free hair-straightening treatment. For a keratin treatment to give you shiny, straighter, frizz-free hair for months, it must contain formalin or another chemical in the same family. Common "formaldehyde free" products often contain: glutaraldehyde, biformal (a.k.a. oxalaldehyde -- note the "aldehyde") and ammonium thioglycolate (the same chemical used in perms).
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