[sfn42]

If it doesn't apply to everything then we don't know whether it applies to this which is exactly my point.

Ionizing radiation is also a great example of something everything on the planet is exposed to all the time and we're fine. So clearly the fact that you'll die standing next to the molten core in Chernobyl does not imply that you'll die from background radiation.

Similarly, showing that an extreme dose of microplastics is harmful does not imply that a normal dose of microplastics is. It might be, but we don't know because we've only tested extreme dosages, apparently.

We also don't know that it works the same way in the body as it does in a test tube.