UAB research has characterized in detail how polymer-based commercial tea bags release millions of nanoplastics and microplastics when infused. The study shows for the first time the capacity of these particles to be absorbed by human intestinal cells, and are thus able to reach the bloodstream and spread throughout the body.
So my tea bags that have a little staple to keep it together might be okay?
Edit: The other kind I have is the top folded over and the string tied through it, but no staple.
A staple is probably a good sign. I think the thermosealed ones have a crimped edge