Hormone-disrupting Chemicals Found In Hair Products For Black Women

by Chloe Reichel , guest writer Many hair products used by black women and children contain chemicals that can interfere with the body’s nat...

by Chloe Reichel, guest writer

Many hair products used by black women and children contain chemicals that can interfere with the body’s natural hormones, though the majority of these chemicals are not listed on their labels, according to new research forthcoming in the journal Environmental Research.

These chemicals, including parabens, fragrances and phthalates, are found in many consumer products. They are known as endocrine-disrupting chemicals (EDCs) because they disturb the functions of the endocrine system, which regulates the body’s production of hormones.

They do this by mimicking the body’s naturally occurring hormones, which can overstimulate cells; they can also block naturally occurring hormones from binding to cells’ receptors, or alter the metabolism of natural hormones. Disruptions to the endocrine system can lead to the development of hormone-mediated diseases like obesity, diabetes and certain types of cancer.

Prior research has found that urinary levels of endocrine disruptors vary by race and ethnicity. For example, black women have higher urinary levels of phthalates and parabens than white women. Black women also experience higher rates of obesity and diabetes, as well as more aggressive forms of breast and endometrial cancers.

Other research suggests that differing personal product care usage might explain these elevated rates of endocrine-disrupting chemicals (EDCs) in black women, which might in turn contribute to the noted health disparities.

With this in mind, scholars at the Silent Spring Institute and Battelle Memorial Institute — non-profit organizations that research environmental chemicals and science and technology, respectively — set out to document the extent to which endocrine-disrupting chemicals are present in hair products used by black women and children.

They focused their research on cataloguing the concentrations of 66 endocrine-disrupting chemicals in 18 popular hair products. The products spanned six categories, including hot oil treatments, relaxers, hair lotions, leave-in conditioners, root stimulators and anti-frizz products.

They selected the products based on survey results that indicated the most frequently used products among black women, along with products used by black women, but not others. The products were first purchased for research in 2008 and the scholars note that their formulations might have changed since.

However, they write that more recent comparisons indicate that most of the products list the same ingredients as before.

They found:

  • Endocrine-disrupting chemicals were present in all of the products tested.

  • Eighty-four percent of the chemicals found in these products went unlisted on their labels.

  • Fragrances were found in all of the products studied. Parabens and phthalates were detected in 78 percent of products.

  • Eleven of the 18 products tested contained chemicals prohibited under the European Union’s Cosmetics Directive or regulated under California’s Proposition 65, which mandates that products containing certain chemicals linked to cancer and reproductive health concerns must carry warning labels.

  • Hair relaxers marketed for use by children were among the products that tested positive for regulated or restricted chemicals.

  • Chemicals detected in products at higher concentrations were more likely to be listed on labels than those detected at lower concentrations.

“Given the exposure and endocrine-mediated health disparities experienced by black women, new research and regulatory activities should consider the effects of ethnic differences in product use on exposures and health,” the scholars conclude.

In addition to the temporal limitation noted, the study is also limited in that it only documents the concentrations of EDCs in 18 products used by black women.

Further, the researchers did not study all the chemicals in these products that might have health effects, instead focusing on chemicals with established links to the endocrine system and asthma.

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