Ahh I see, reading a bit more, I think the idea is that the gut is filtering out the larger particles but simulation indicates the BBB could pass micro-plastics

Ahh I see, reading a bit more, I think the idea is that the gut is filtering out the larger particles but simulation indicates the BBB could pass micro-plastics. > These findings together with the computer model underline that MNP PS particles can cross the gastrointestinal barrier and the BBB within a short time, but only 0.293 µm sized particles were able to be taken up from the gastrointestinal tract and to penetrate the BBB. This suggests that the size of the particles may be a critical factor in their ability to penetrate the BBB [42].