Do personal care products like shampoo and lotion affect thyroid function?

What's actually in it

Personal care products including shampoos, conditioners, lotions, perfumes, and makeup contain parabens, phthalates, triclosan, benzophenone UV filters, and synthetic fragrances. All of these have endocrine-disrupting properties to varying degrees. They absorb through skin and scalp during normal use.

Thyroid hormones regulate metabolism, body temperature, heart rate, and energy. The thyroid is particularly sensitive to endocrine disruptors because it relies on precise hormonal signaling to function correctly.

What the research says

A 2026 study in Ecotoxicol Environ Saf examined exposure to personal care product chemicals and thyroid function in adults. Researchers found that higher exposure was associated with disrupted thyroid hormone levels, specifically altered T3, T4, and TSH patterns. Multiple chemical classes contributed to the effect.

Daily personal care product use is one of the highest dermal chemical exposures people have. It happens every morning before anything else.

Simplify your routine. Fewer products means fewer chemicals. When you do use products, choose fragrance-free options with short ingredient lists. For household fabrics that touch skin, organic cotton home goods don't carry synthetic chemical residues.