Health Claims

When these lab rats breathe in fumes from overheated non-stick coating at a certain level, their lungs get inflamed really quickly — within just 4 hours — and lots of immune cells rush into the lungs, showing their bodies are reacting strongly.

Experts think the EPA should include more different scientific opinions when deciding how risky PFAS chemicals are, so their decisions are clearer, more consistent, and more trustworthy.

The EPA's new rules on PFAS in drinking water will probably hold up in court because judges usually trust government experts, even if scientists don't all agree.

If we figure out how PFAS chemicals actually harm the body, we might be able to set better safety limits and clear up confusion about how dangerous they really are.

The EPA just made the safe limit for two harmful chemicals in drinking water way stricter—dropping from 70 to just 4 tiny parts per trillion—but some scientists are saying that big drop isn't really backed by solid science.

Different health agencies can't agree on how much of certain 'forever chemicals' like PFOA are safe to be exposed to — their safety limits vary by as much as 1,000 times, so experts say they need to get on the same page.

If a pregnant person is exposed to certain chemicals called PFOS and PFOA, it might harm the baby’s development, and even very tiny amounts could be risky.

Scientists can use a special model that tracks how fish absorb and get rid of harmful chemicals like PFAS to predict how much builds up in their bodies — which helps keep our food and environment safer.

PFAS chemicals build up in fish, and since people around the world eat a lot of fish, this could be bad for our health. These chemicals are found most in dust from firefighting buildings and least in drinking water.

When studying the health effects of PFAS chemicals, using grouped data (like averages for groups of people) gives results that are almost as accurate as using detailed individual data — as long as the effect increases steadily with dose.

Fancy math models that bend at different points give better estimates of safe chemical exposure levels from real-world human data than older, simpler models — especially when studying how PFAS chemicals affect the immune system.

PFOA, one of the 'forever chemicals' in non-stick and waterproof products, might weaken how well vaccines work in people — and it seems to be more harmful than other similar chemicals, so we shouldn’t treat them all as equally dangerous.

A study from the Faroe Islands found that the safe level of PFAS chemicals might be much lower than what Europe currently says is safe — meaning kids might not be protected enough from harm to their immune systems.

Kids with more PFAS chemicals in their blood seem to have weaker responses to vaccines, and even very low levels — like 1.3 to 1.5 nanograms per milliliter — might be enough to cause this. That’s way lower than what safety rules usually consider risky.

The EPA's super strict safety levels for two chemicals in drinking water are way lower than other countries' rules — like thousands of times lower — so some people question whether the science behind them really adds up.

The EPA says it's okay to have up to 2000 tiny bits of PFBS in a trillion drops of drinking water, but only 10 bits of GenX — showing that safety levels for these chemicals vary a lot.

The EPA says super tiny amounts of a chemical called PFOA in water could be harmful, but our current tools can't reliably detect levels that low — we can only measure down to a level 1,000 times higher.

The EPA just made its safety limits for two harmful chemicals in drinking water way stricter — now saying even tiny amounts of PFOA and PFOS can be risky, much lower than before and compared to other countries.

We might need to rethink how we calculate safety limits for certain 'forever chemicals' because babies in the womb and newborns are probably the most sensitive, and protecting them could already cover most differences between people.

Switching to more realistic body-based models for tracking chemicals like PFOA and PFOS might help scientists better figure out how much of these substances people are actually taking in.

Scientists might be able to set better safe limits for toxic chemicals in drinking water by rethinking how they analyze immune system effects in studies.

The EPA changed how it calculates safe levels of PFOA and PFOS in drinking water, using new science methods, which led to much stricter safety limits—from 70 to nearly zero in some cases.

In male mice, drinking water with a chemical called GenX for 14 weeks was linked to higher activity of certain genes in the liver that are tied to inflammation, cell growth, and scarring — and the more GenX they drank, the stronger the effect.

In male mice, drinking water with low levels of a chemical called GenX for about 3 months led to signs of liver damage, like swelling, scarring, and unhealthy changes in liver cells.