unfortunately these products contain formaldehyde or gluteraldehyde which are much stronger relaxing agents than the thioglycolate that is typically found in most relaxing products. keratin is the window dressing on most of these products because they can still damage the hair and make it very brittle. repeated use of these products too close together can compromise hair strength and result in breakage. consumers should also be aware of the fact that some brazilian treatments have much higher formaldehyde content than is allowed by fda guidelines. these can result in damage or irritation to the eyes throat and lungs.
are keratin-infusing products and therapies safe for your hair?