While hair loss may or may not be caused by the keratin hair treatment, which is used to straighten hair, post-care treatments that may help prevent hair loss include the application of natural remedies, taking vitamin B12 and biotin supplements and consuming more iron-rich foods. Hair loss should also be the least of concern when it comes to keratin treatment, as the formula in the solution used for the treatment contains formaldehyde.
Formaldehyde is a toxic chemical and is a known carcinogen. Exposure to formaldehyde may cause symptoms such as irritation of the eyes, nasal passages and upper respiratory tract. Long-term exposure to the chemical, on the other hand, can cause more serious medical conditions, such as nasal cancer and leukemia.
In a research conducted by the Good Housekeeping Research Institute, four popular keratin treatment brands used in most salons in the United States contained more formaldehyde than the recommended 0.2 percent limit by the Cosmetic Ingredient Review.
To care for keratin-treated hair, regularly applying natural remedies such as coconut milk and aloe vera gel may help prevent hair loss. Drinking green tea, lettuce and spinach juice and eating more vitamin B12-rich food may also help keep the hair healthy after treatment. However, both the Oprah and Good Housekeeping websites recommend not getting the keratin hair treatment at all.