Tea ranks as one of the most popular drinks on the planet. But a recent review of 19 scientific studies raises a question: are tiny plastic particles hitching a ride into your cup? The research suggests that plastic particles can enter tea in several different ways – and that teabags may play a bigger role than many people realize.
The review focused on microplastics and nanoplastics, grouped together as MNPs. Microplastics range from about one micrometer to five millimeters, while nanoplastics fall below one micrometer. Tiny particles don't originate from just one source. They can come from packaging, processing, brewing materials, and even the air.
Cold bottled tea, bubble tea, and hot brewed tea each follow their own path for picking up plastic. Bottled tea can acquire particles from the water used during production, as well as from the bottle and cap. Bubble tea introduces even more contact points – including the cup, lid, straw, mixing water, and other ingredients.
A review found that teabags were the clearest source in hot tea. The result surprises many people because the bags often appear to be made of paper. Appearances can be misleading. Some "pyramid" sachets use plastic mesh, while other bags blend plant fibers with plastic. Certain cellulose bags also contain polypropylene as a heat-seal layer. Even bags sold as "compostable" or "biodegradable" are not always plastic-free.
In one experiment, researchers reported that a single plastic teabag released about 14.7 billion tiny particles. Another study reported about 1.3 billion particles per bag. Researchers also detected large numbers released from bags made with bioplastic PLA.
Measuring plastic is harder than it sounds. Finding tiny particles in a drink is not as simple as pouring tea through a filter. Scientists still have to prove a particle is actually plastic. Contamination is a constant headache. Fibers from clothing, particles in lab water, and dust in the air can all sneak into samples.
Plastics do not come alone. Manufacturers add chemicals to change flexibility, color, and performance. Several studies found plastic-related chemicals in tea infusions, including breakdown products, some plasticizers, and bisphenol-type compounds.
The review does not claim that particles from teabags automatically harm people. However, the research paper did point to early laboratory evidence. In one study, tiny water fleas known as Daphnia were exposed to diluted liquid that had leached from nylon and PET teabags. Researchers found particles inside the animals and reported abnormal body features. Another study used human intestinal cell models. The cells interacted with or took up the particles, but short tests did not show major cell death.
So yes, a cup of tea can carry more than just tea. But the takeaway is not panic – it's perspective. When you see a claim that teabags release billions of plastic particles, take a moment to look closer. The bag, the bottle, the cup, and the lab methods all shape the story.