Do toxic metals and PFAS from household products end up in breast milk?

What's actually in it

A nursing mother's body uses her blood to make breast milk. Whatever chemicals are in her blood can transfer into the milk. Arsenic, cadmium, lead, mercury, and PFAS all make this journey. They come from food, water, cookware, personal care products, and household dust.

Babies drink breast milk exclusively for months. Their small bodies process these chemicals less efficiently than an adult's, so the dose per pound of body weight is high.

What the research says

A 2026 systematic review in Environ Res compiled data from studies around the world on toxic metals and PFAS in breast milk. They looked at what levels are present and where the contamination comes from.

All five chemicals (arsenic, cadmium, lead, mercury, and PFAS) were found in breast milk samples globally. Levels varied by region, diet, and individual exposure patterns.

Lead and mercury levels in breast milk tracked closely with the mother's diet and drinking water. Women who ate more fish had higher mercury; women in areas with older plumbing had higher lead.

PFAS levels in breast milk reflected the mother's lifetime accumulation from nonstick products and food packaging. Because PFAS don't break down, decades of exposure show up in the milk.