Can household chemicals disrupt thyroid function during pregnancy?

What's actually in it

Every day, pregnant women are exposed to a mix of endocrine-disrupting chemicals (EDCs) from everyday household products. Phthalates come from vinyl flooring, shower curtains, and fragranced products. Bisphenols leach from plastic food containers and canned food linings. PFAS shed from nonstick cookware and stain-resistant fabrics. Parabens are in shampoos and lotions.

These chemicals don't act alone. Inside your body, they combine into a cocktail that can interfere with the hormone system. The thyroid gland is especially vulnerable because it regulates metabolism and is critical for fetal brain development.

What the research says

A 2026 study in Int J Hyg Environ Health measured exposure to a mixture of endocrine-disrupting chemicals in pregnant women and tested how those mixtures affected thyroid function. The researchers found that higher exposure to EDC mixtures was associated with altered thyroid hormone levels during pregnancy.

This matters because thyroid hormones control brain development in the fetus, especially during the first trimester when the baby relies entirely on the mother's thyroid hormones. Even small changes in maternal thyroid levels can affect the baby's IQ, language development, and attention later in childhood.

The study is important because it looked at real-world mixtures, not just one chemical at a time. In your daily life, you're never exposed to just one EDC. You're exposed to dozens simultaneously. The combined effect can be stronger than any single chemical alone.

To protect your thyroid during pregnancy, reduce exposure from the biggest sources. Switch to fragrance-free personal care products. Use glass or stainless steel for food storage. Choose PFAS-free cookware. And ventilate your home regularly to clear out dust that carries these chemicals.