Keratin treatments are popular for making hair smooth and frizz-free. But do they harm your hair? The answer is a bit mixed. Some keratin treatments use chemicals like formaldehyde, which can be harsh and come with health risks like dizziness, headaches and nausea1.
Over time, continuous keratin treatments could make hair weaker, especially if you get the treatment a lot. Some processes may use excessive heat, which can dry out the hair and cause it to split, leaving you with split ends. If you want a keratin treatment, look for one that’s free of harsh chemicals and ask your stylist if it’s the right choice for your hair.