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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 hair of some Africans is elliptical in shape and therefore very tightly curled (east Asian hair tends to be round and European hair is in-between). The relaxer cream breaks down the chemical bonds of the hair shaft, disrupting the elliptical shape and reconstructing the bonds in a different way.
A purer, more stable form of calcium hypochlorite is called HTH or high test hypochlorite. It is also available as bleaching tablets that contain calcium hypochlorite and other ingredients to prevent the tablets from crumbling. A supposedly more stable mixture of calcium hypochlorite and quicklime (calcium oxide) is known as "tropical bleach". [22]
In October 2011, the consulting firm ChemRisk, LLC published a study in the Journal of Occupational and Environmental Hygiene that also found that some hair-smoothing products, including some labeled formaldehyde-free, contain formaldehyde and could expose workers and customers to formaldehyde at levels above OSHA's short-term exposure limit ...
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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]
Formaldehyde is used in many household products, including some topical medicines and cosmetics such as some nail polishes, hair gels, baby shampoos and others. Not all chemical hair-straighteners ...