PFAS chemicals—used in many cosmetics and industrial products—can weaken your immune system, particularly your vaccine response. The research links PFAS exposure to increased asthma, allergies, and inflammatory bowel disease in humans. These effects happen mainly through skin contact, inhalation, and ingestion, though scientists say we need more human studies to fully understand the risks.

This was a review of existing research, combining human epidemiological studies with animal and lab testing data to examine how PFAS affects immunity at exposure points like skin, lungs, and the gut.

Funding not disclosed in abstract