Is PFAS exposure linked with lower vaccine antibody levels?
Yes, in a small adult study. A 2026 Environmental Research study found higher serum PFAS was linked with lower COVID-19 antibody levels among vaccinated adults, but results weakened after excluding prior COVID-19 cases.
What is actually in it
PFAS are per- and polyfluoroalkyl substances. They can come from some stain-resistant textiles, grease-resistant packaging, nonstick coatings, dust, and contaminated water.
PFAS have been studied for immune effects, including antibody response after vaccination. This does not mean vaccines stop working. It means chemical exposure is one factor researchers are studying in immune response.
What the research says
A 2026 Environmental Research study measured serum PFAS and COVID-19 spike IgG antibody levels in 74 fully vaccinated adults. The participants came from a cohort with PFAS-contaminated drinking water.
PFHxS, PFOS, PFHpS, and the sum of 9 PFAS were negatively associated with antibody levels in the full model. PFHxS had beta -0.38 with p value 0.002.
The study has an important limit. After researchers excluded 7 people with prior COVID-19, the associations became weaker and were no longer statistically significant for PFHxS and several other PFAS measures.
This supports concern about PFAS and immune response, but it does not mean a person should skip vaccines. Vaccination remains protective. Reducing PFAS exposure is a separate prevention step.
What to do next
Lower PFAS exposure where you can. Choose untreated textiles, avoid stain-resistant sprays, limit grease-resistant takeout packaging, and replace worn nonstick items when practical.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Associations of serum PFAS with COVID-19 antibody levels among fully vaccinated adults. | Environ Res | 2026 |