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Some companies have responded by developing formaldehyde-free formulas or by clearly labeling products that contain the chemical. Not all chemical hair relaxers include formaldehyde, but many do ...
It alleges that hair products contain endocrine-disrupting chemicals that increase the risk of cancer. The plaintiffs further charge that companies knew the risks but failed to disclose them.
The US Food and Drug Administration is planning to propose a ban on certain hair-straightening products, such as chemical relaxers and pressing products, that have been linked to health risks.
Because of these concerns, since 1976 or earlier, European regulations on cosmetics banned products containing or releasing formaldehyde. Products containing any aldehydes more than 0.001% in leave-on products or 0.01% in rinse-off products were required to list the ingredients explicitly in their product labels. [6]
Formaldehyde in the EU is restricted to a maximum allowed concentration in finished products no greater than 0.2%. [2] However, there are hidden sources of formaldehyde such as these formaldehyde releasers. As well, patch tests are prone to false positives at even low concentrations and not a reliable test. [2]
Products for bleaching one's hair at home usually contain a 6% solution of hydrogen peroxide, while products for use in a hair salon can contain up to 9%. [15] Hair bleaching products can damage hair and cause severe burns to the scalp when applied incorrectly or left on too long. [17]