Hair relaxers are chemical treatments used to straighten curly or coily hair, but they can be damaging if used improperly or too frequently. They often contain phthalates, which are known to be endocrine disruptors that can interfere with the body's hormonal system.
Exposure to Di-2-ethylhexyl phthalate (DEHP) in hair relaxers has been associated with various health issues such as developmental and reproductive issues, asthma, allergies, liver damage, and possibly cancer. Some countries have restricted the use of certain phthalates in products like hair treatments, and the US has banned several types of phthalates under the Consumer Product Safety Improvement Act of 2008.
Chemicals present in hair relaxers are intended to straighten curly hair temporarily by breaking down protein bonds, but some of these chemicals might act as endocrine disruptors.