Can microplastics found in milk cartons and water bottles end up in what you drink?

What's actually in it

Milk cartons, water bottles, and juice boxes are all made from or lined with plastic materials. Over time, especially during transport and storage, these materials shed tiny particles into the liquid inside. Every sip from a plastic-lined container brings a small dose of microplastics.

What the research says

A 2025 study in Environ Monit Assess tested drinking water bottles and milk packaging for microplastic contamination. The researchers found microplastics in both product types. The particles varied in size and plastic type, with polyethylene and polypropylene being the most common.

Since people drink water and milk every day, this represents a constant, unavoidable source of microplastic exposure. Children who drink more milk relative to their body weight face higher exposure per pound.

Buy milk in glass bottles when available. Use a reusable glass or stainless steel water bottle. If you buy plastic-packaged milk, keep it refrigerated and use it quickly rather than storing it for days.