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Unveiling the invisible burden from cup to body: a comprehensive profiling of microplastics and nanoplastics released from tea bags
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Steeping your tea in a plastic tea bag might be doing more than flavoring your cup — a review of 22 studies found that a single plastic tea bag can shed hundreds of thousands to billions of tiny plastic particles (microplastics and nanoplastics) into your hot water during brewing. These particles are small enough to enter your body, and while scientists are still studying the health effects, this research suggests switching to paper, loose-leaf, or plastic-free tea bags could reduce your exposure.
Microplastics and nanoplastics have emerged as a critical threat to human health due to their ability to infiltrate biological systems and potentially cause adverse effects. This systematic review analyzes 22 studies to evaluate tea bags as a significant source of these hazardous particles. To achieve this objective, a comprehensive search was conducted across reputable databases, including PubMed, Scopus, and Web of Science (WOS) covering studies up to September 28, 2025. Constituent Material of Teabag, Characterization Methods, Type, Abundance, Size, and Morphology of MPs, NPs, and related materials were thoroughly assessed. Out of 150 initially identified articles, 22 studies met the inclusion and exclusion criteria and were included in the final analysis. The findings reveal that a single plastic tea bag can release hundreds of thousands to billions of microplastic and nanoplastic particles during typical brewing conditions. This comprehensive review establishes plastic tea bags as a direct and substantial exposure route for human microplastic and nanoplastic ingestion, highlighting the urgent need for regulatory attention and development of safer alternative materials in food contact products.
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Microplastics and nanoplastics in tea: Sources, characteristics and potential impacts
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This review looks at how microplastics and nanoplastics end up in tea, with plastic teabags being the biggest culprit, releasing over a billion tiny particles per bag when steeped in hot water. Even biodegradable and composite tea bags release significant amounts of plastic particles, raising health concerns given that tea is one of the most widely consumed beverages in the world.
Tea bags as hidden source of micro- and nanoplastics: a systematic review for food safety.
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Researchers systematically reviewed 19 studies on microplastic and nanoplastic release from tea bags during brewing, finding that plastic-containing bags—particularly polypropylene and nylon—release billions of particles per bag at typical brewing temperatures, with release rates shaped by material type, water temperature, brew time, and agitation, though standardized detection methods remain lacking.
Microplastic release from fiber and coated commercial tea bags: a fluorescence microscopy screening of eight products
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Every tea bag tested released tiny plastic particles into hot water, even ones labeled biodegradable or plastic-free, with amounts varying widely between brands. Surprisingly, most bags showed signs of polypropylene plastic despite different labeling, so what a package claims doesn't reliably predict what actually ends up in your cup. Scientists still don't know if these particle levels pose a real health risk.
Microplastic Contamination in Tea
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Steeping a single "premium" plastic tea bag at high heat can release billions of tiny plastic particles into your cup, while loose-leaf tea poses much lower risk. Current exposure levels are still considered low, but scientists worry about long-term effects from these particles building up in the body over time, especially since they can carry other harmful chemicals with them. If you want to play it safe, this research suggests switching to loose-leaf tea or non-plastic tea bags and skipping the scalding-hot, long steeps.
Determination of the microplastic particle release by tea bags during brewing
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Researchers measured the release of microplastic particles from tea bags during brewing, finding that plastic particles leach into the hot beverage. This study highlights an often-overlooked source of microplastic ingestion through everyday food and drink preparation.
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