Tea Bags and Microplastics

A 2019 study published in Environmental Science & Technology found that a single plastic tea bag releases approximately 11.6 billion microplastic particles and 3.1 billion nanoplastic particles into the water when brewed at 95°C. This is orders of magnitude higher than the microplastic contamination found in other foods and beverages.

Which Tea Bags Contain Plastic?

Many premium and specialty tea bags are made from plastic-based materials, including:

- Nylon (often used in pyramid-shaped "silken" bags)
- Polypropylene (used in heat-sealed paper bags to bond the seams)
- PET (polyethylene terephthalate) (used in some mesh bags)
- Cellulose acetate (a semi-synthetic plastic derived from wood pulp)

Even bags marketed as "natural" or "biodegradable" may contain plastic components in their sealing or mesh structure.

What Are the Health Risks?

The health effects of ingesting microplastics are still being studied, but early research suggests potential concerns including inflammation, endocrine disruption, and accumulation in body tissues. The World Health Organization has called for more research into the health impacts of microplastic ingestion.

The Simple Solution: Loose-Leaf Tea

The most effective way to avoid microplastics in your tea is to switch to loose-leaf tea brewed in a ceramic, glass, or stainless steel infuser. Loose-leaf tea also tends to be higher quality, fresher, and more flavorful than tea bags — so the switch is a win on every level.

Traditional Chinese teas are almost always consumed as loose-leaf, brewed in a gaiwan, clay teapot, or glass vessel. This is not just a cultural preference — it's the healthiest and most flavorful way to drink tea.