Can a mix of BPA, phthalates, and other common hormone disruptors affect thyroid function during pregnancy?

What's actually in it

Pregnant people are simultaneously exposed to BPA from food packaging, phthalates from personal care products and flexible plastics, parabens from cosmetics, triclosan from antimicrobial soaps, and other endocrine-disrupting chemicals. No single chemical causes all thyroid disruption; the combined effect matters.

Thyroid hormones are essential during pregnancy for fetal brain development, placental function, and maternal metabolism. Even modest disruption of the T3/T4/TSH balance can alter fetal neurodevelopment in ways that become apparent as cognitive and behavioral differences in childhood.

What the research says

The 2026 SELMA cohort study in Int J Hyg Environ Health measured a mixture of endocrine-disrupting chemicals in pregnant Swedish women and analyzed their thyroid function tests. Women with higher combined exposure to the EDC mixture showed disrupted TSH and free thyroid hormone levels.

The mixture analysis is important here: individual chemicals showed weaker associations. The combined exposure produces a stronger disruption than any chemical alone, consistent with chemicals acting on overlapping thyroid pathways simultaneously. Thyroid disruption in pregnancy is linked to lower child IQ, ADHD risk, and developmental delays.

Pregnant people can reduce their EDC mixture load by targeting the highest-exposure sources. Fragrance-free personal care products reduce phthalates and parabens. Glass or stainless containers for food reduce BPA. Avoiding triclosan in antibacterial products (regular soap works just as well) reduces that contributor. Each source removed lowers the total mixture burden.