Where the concern came from
Laboratory studies have measured very large numbers of micro- and nanoplastic particles released from some plastic tea bags at hot-water temperatures. The amount released depends on the bag material and how the study measures particles.
Exposure is not the same as proven harm
Finding particles in a drink does not automatically prove that the exposure causes disease. Researchers are still working out how much is absorbed, where particles go in the body and what levels matter clinically.
What regulators say
Food-safety agencies continue to evaluate microplastics in food and packaging. Current evidence does not support dramatic claims that one cup of tea is “toxic,” but reducing unnecessary plastic contact is reasonable if it is easy to do.
Simple ways to reduce plastic contact
Use loose-leaf tea with a metal strainer, choose paper tea bags that do not contain plastic, avoid boiling food in disposable plastic when alternatives are available, and follow manufacturer instructions for food containers.