Researchers found that among more than 1,000 pregnant women they followed, those who used certain hair products -- dyes, bleaches, relaxers or mousse -- had lower levels of several hormones, including estrogen and progesterone.
were more likely to have a baby who was small for gestational age -- a sign of growth restriction in the womb.The new study"fits in well" with that overall body of research, said Alexis Temkin, a toxicologist with the nonprofit Environmental Working Group in Washington, D.C.
It links hair product use to hormonal differences that are consistent with some of the health effects that have been tied to such products, according to Temkin.-- are based on 1,070 pregnant women in Puerto Rico who made up to three study visits over the course of their pregnancy. They completed questionnaires on personal product use and gave blood samples to have their hormone levels measured.
Overall, levels of estrogen, progesterone and testosterone were lower among women who reported using"other" hair products, versus nonusers. That category included dyes, straighteners, bleaches and mousse, but not shampoo, conditioner, hair spray or hair gel. It's not clear, according to Rivera-Nunez, whether women who use those hair products might be exposed to particular chemicals that are problematic, or have a higher level of exposure to endocrine disruptors.
Beyond that, there are many factors that might sway pregnancy hormones. The researchers factored in the variables that they could -- such as women's pre-pregnancy body weight, income and education levels, as well as their smoking and drinking history.For now, she recommended that women who are pregnant or planning a pregnancy read labels and be aware of what they are putting on their bodies. At the same, she acknowledged that those labels are not necessarily consumer-friendly.
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