Hair smoothing products, also referred to as hair straightening products, may release formaldehyde gas, a known human carcinogen, when heated. Only licensed and trained salon professionals should use these products on your hair. Here are some steps to take if you are considering using them.
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FDA plans to propose ban on formaldehyde in hair smoothing, straightening products — here's what to know. - CBS News
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Formaldehyde-free Hair Straightening Treatment KL - The Yum List
KeratinUSA Hair-Straightening Enhanced Formula Treatment is a formaldehyde-free keratin and protein hair-straightening and restoration system with
Keratin Hair-Straightening Formaldehyde-Free w/ L-Cysteine Treatment Duo 16oz / 500ml plus FREE Keratin Silk Treatment Enhanced Formula 8oz / 237ml
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Moroccan Keratin Express Formaldehyde-Free Brazilian