Is there any high quality research into the health effects? I keep hearing about how microplastics spread, but not whether that's demonstrably bad.

I found this (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10151227/) , but it's a wildly broad overview, and includes claims both dubious and entirely believable, buried in tons of uninteresting stuff about how plastic can spread and how common it is.