Is it safe to use plastic tea bags for brewing tea at boiling temperatures?

What's actually in it

Plastic tea bags are often made from nylon or polyethylene terephthalate (PET). When you pour boiling water over these materials, they don't just sit there. They break down and shed microplastics directly into your cup.

Beyond the plastic particles themselves, these bags can contain bisphenol analogues. These are chemicals used in plastic production that can act as endocrine disruptors. When exposed to high heat during the brewing process, these substances leach into your tea.

What the research says

A 2026 study in Environ Sci Process Impacts used advanced imaging to confirm that nylon tea bags release microplastics into tea during the brewing process.

The health risks of these particles are significant. A 2026 study in J Hazard Mater found that microplastics from tea bags cause oxidative stress and steatosis (a buildup of fat in the liver) in embryonic models. This is supported by a 2026 study in Adv Sci (Weinh), which linked chronic exposure to PET microplastics to the disruption of gut-liver health.

Furthermore, a 2026 study in Food Chem conducted a nationwide investigation and confirmed that tea products are contaminated with bisphenol analogues, creating a clear exposure risk for consumers. Even the aging of plastic materials under heat, as noted in a 2026 study in Environ Sci Technol, accelerates the release of harmful particles that fuel liver damage.