In male mice, drinking water with very small amounts of a chemical called GenX for about three and a half months led to signs of liver damage, like higher levels of certain blood markers, and the more GenX they were exposed to, the worse the effects seemed.

What we've found so far suggests that long-term exposure to GenX in drinking water may be linked to liver damage in male mice. Our analysis of the available research shows consistent signs of liver changes in male mice exposed to low levels of GenX over several months. We looked at two assertions from the evidence, both of which support a connection between GenX exposure and liver damage in male mice [1,2]. In one set of findings, male mice that drank water containing small amounts of GenX for about three and a half months showed higher levels of blood markers linked to liver issues, and the effects appeared to increase with higher exposure levels [1]. In another, male mice exposed to low levels of GenX for around three months showed physical changes in the liver, including swelling, scarring, and abnormal cell changes [2]. The evidence we’ve reviewed does not include any studies that refute these findings. The two assertions we analyzed are based on animal studies, and both report observable signs of liver damage following prolonged GenX exposure. While the evidence we’ve reviewed leans toward a link between GenX in drinking water and liver harm in male mice, we are still building our understanding. These findings come from controlled lab settings, and we don’t yet know how this might relate to humans or other species. Our current analysis is based on a small number of assertions—just two—and both point in the same direction. However, we remain cautious because the total body of evidence is limited. As we gather more data, our understanding may change. Practical takeaway: In male mice, drinking water with GenX over several months has been linked to signs of liver damage in lab studies. We don’t know yet what this means for people, but it suggests GenX may affect the liver with long-term exposure.