If a woman is exposed to higher levels of a chemical called PFDA, it might be harder for her to get pregnant — each step up in exposure is linked to lower chances of pregnancy, and this chemical could be one of the main reasons why these types of pollutants affect fertility.

What we've found so far suggests that PFDA, a type of PFAS chemical, may be linked to lower chances of pregnancy in women. The evidence we've reviewed leans toward the idea that higher exposure to PFDA could play a notable role in how these pollutants affect female fertility [1]. Our analysis of the available research shows that each increase in PFDA exposure is associated with a decrease in the likelihood of becoming pregnant [1]. Based on what we've reviewed so far, this chemical stands out as one of the key PFAS compounds that might be driving the connection between pollutant exposure and reduced fertility in women. However, we are still building our understanding, and this is based on a single assertion supported by 52.0 studies — we do not yet have a full picture of how PFDA compares to other PFAS chemicals across a wide range of populations or exposure levels. We want to be clear: we are not saying PFDA is the definitive or only important chemical in this area. We are simply reporting that the evidence we’ve analyzed so far points in this direction. There are no studies in our current review that contradict this finding, but that does not mean the case is closed. More research could shift or refine this view over time. At this stage, our current analysis does not allow us to claim that PFDA "causes" fertility issues, only that it is linked to lower pregnancy chances in the data we’ve seen. We also cannot say for sure whether it is the main PFAS chemical involved, only that the evidence highlights it as a strong candidate. Practical takeaway: If you're concerned about fertility, reducing exposure to PFAS chemicals — including PFDA — might be a reasonable step, since these substances are found in some non-stick pans, waterproof clothing, and contaminated water sources.