Can chemicals in personal care products affect a pregnant woman's thyroid health?

What's actually in it

Personal care products like lotions, shampoos, deodorants, nail polish, and cosmetics contain a mix of chemicals that absorb through your skin. Common ones include parabens (preservatives), phthalates (fragrance carriers and plasticizers), triclosan (an antimicrobial), and benzophenones (UV filters).

During pregnancy, your thyroid works overtime to support the baby's brain development. Any disruption to thyroid hormone levels during this period can have lasting consequences.

What the research says

A 2026 prospective study in Environ Int tracked personal care product chemical exposure in pregnant women and measured their thyroid hormone levels throughout pregnancy.

Women with higher levels of triclosan had lower free thyroxine (FT4), the active thyroid hormone that drives fetal brain development. Higher paraben levels were linked to changes in thyroid-stimulating hormone (TSH), suggesting the thyroid was working harder to keep up.

Phthalate metabolites from fragranced products also showed associations with altered thyroid function. The effects were strongest in the first trimester, exactly when the baby depends entirely on the mother's thyroid hormones for brain development.

The study highlighted that women use an average of 12 personal care products daily, each contributing a small chemical dose. The combined exposure adds up fast.

During pregnancy, switch to fragrance-free, paraben-free products. Look for "triclosan-free" labels on hand soap and toothpaste. Fewer products with simpler ingredient lists mean less total chemical exposure.