Using certain hair products during pregnancy may negatively impact maternal hormone levels

Robert Hundley

The components discovered in own treatment and attractiveness solutions frequently include a large array of endocrine-disrupting chemical substances like phthalates, parabens, and toxic metals. They interact with hormone devices and influence hormone synthesis, regulation, transport, metabolism, and even hormone reception.

A research in Environmental Analysis investigated a probable link between the use of these goods and the degrees of sex steroid hormones, together with estrogen, progesterone, and thyroid hormones, in pregnant girls living in Puerto Rico.1

Specific hair items like hair dyes, bleach, relaxers, and mousse were associated with decreased concentrations of sexual intercourse steroid hormones. Altering hormone stages, particularly in the course of pregnancy, can have long lasting repercussions. At beginning, this may possibly lead to fetal progress restriction, preterm start, and reduced beginning pounds. It may perhaps also impact infant and youngster progress and pubertal trajectories, and even impact progress of hormone-sensitive cancers like breast and ovarian most cancers.2

Working with information from Puerto Rico Secure, an ongoing future delivery cohort made to examine environmental exposures among the pregnant women of all ages and their small children, researchers analyzed blood samples from 1,070 pregnant gals among age 18 and 40 in Puerto Rico. None of the females experienced utilized oral contraceptives in the 3 months prior to being pregnant, nor did they use in vitro fertilization. Researchers also sought to comprehend if and how demographic elements motivated the use of specified personal products.

Individuals underwent physical exams and accomplished a sequence of questionnaires about their use of individual treatment goods, which integrated perfumes and cologne, soap, lotions, cosmetics, nail polish, shampoos, conditioners, shaving creams, and mouthwash.

Researchers calculated the ranges of 9 hormones in every single woman’s blood sample: corticotropin-releasing hormone, intercourse-hormone binding globulin, estriol, progesterone, testosterone, thyroid-stimulating hormone, full triiodothyronine, overall thyroxine, and free of charge thyroxine. Every single participant presented blood samples twice in the course of their pregnancy—once at the to start with pay a visit to (n = 910)and after at the third visit (n = 633). The necessarily mean age of the women supplying samples was 28 years and 80{5c5ba01e4f28b4dd64874166358f62106ea5bcda869a94e59d702fa1c9707720} under no circumstances smoked.

All sex steroid hormone concentrations were reduce in ladies who utilized certain hair items than individuals who did not: SHBG ({5c5ba01e4f28b4dd64874166358f62106ea5bcda869a94e59d702fa1c9707720}Δ = −7.1, 95{5c5ba01e4f28b4dd64874166358f62106ea5bcda869a94e59d702fa1c9707720}CI: −12.4,-1.8), E3 ({5c5ba01e4f28b4dd64874166358f62106ea5bcda869a94e59d702fa1c9707720}Δ = −23.2, 95{5c5ba01e4f28b4dd64874166358f62106ea5bcda869a94e59d702fa1c9707720}CI: −32.2,-13.), progesterone ({5c5ba01e4f28b4dd64874166358f62106ea5bcda869a94e59d702fa1c9707720}Δ = −21.5, 95{5c5ba01e4f28b4dd64874166358f62106ea5bcda869a94e59d702fa1c9707720}CI: −29.4,-12.9), and testosterone ({5c5ba01e4f28b4dd64874166358f62106ea5bcda869a94e59d702fa1c9707720}Δ = −21.5, 95{5c5ba01e4f28b4dd64874166358f62106ea5bcda869a94e59d702fa1c9707720}CI: −33.1,-7.8).

Earnings, instruction, and employment standing also motivated the use of personal treatment solutions in expecting women. For case in point, women of all ages who described a family earnings increased than $100,000 utilized own treatment items far more usually than women with reduced family incomes. Utilized ladies also documented employing far more cosmetics than unemployed gals.

“This details is critical because it will enable us to discover populations who are at an increased risk of chemical exposures associated with own care product or service use,” explained direct creator, Zorimar Rivera-Núñez, an assistant professor at the Rutgers Faculty of Community Wellness.

Rivera-Núñez endorses that ob-gyns inform and guide their reproductive-age clients about the potential wellbeing impacts of endocrine-disrupting substances in private care solutions.

“We ought to replicate this study in other populations,” she said. “There is a sturdy tradition of magnificence impact amid Latina ladies, but also other populations, together with Black girls. This will assistance us to determine populations at hazard. Next, refining equipment like frequency-of-use questionnaires by including manufacturers and much more time points will also be helpful to superior evaluate publicity, and analyzing numerous own treatment solutions at the identical time will assistance assess the effect of many exposures.”


  1. Rivera-Núñez Z, Ashrap P, Barrett ES, et al. Personalized care products: Demographic characteristics and maternal hormones in expecting girls from Puerto Rico. Environmental Investigation. Published on the web November 2021:112376. doi:10.1016/j.envres.2021.112376
  2. Hair dye, relaxer use connected with decrease sexual intercourse steroid levels for the duration of pregnancy. Posted 2022. Accessed January 3, 2022. the course of-being pregnant
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