Can microplastics show up in human biological samples?

What's actually in it

Microplastics and nanoplastics are tiny plastic particles. They can come from food packaging, bottled drinks, synthetic dust, air, water, and plastic items that wear down over time.

People can be exposed by eating, drinking, and breathing. Scientists are still learning how much exposure matters for long-term health.

What the research says

A 2026 systematic review in Science of the Total Environment looked at studies from 2020 to 2025 on microplastics and nanoplastics in human biological samples.

The review found these particles reported across many sample types. The most studied matrices included blood at 30.2%, stool at 12.3%, and skin at 9.9%. The most common polymers were polyethylene, polypropylene, and polystyrene.

The review also notes that health effects and real-world exposure levels remain uncertain. That means this is a reason for practical exposure reduction, not panic.

What to do at home

Start with repeated food-contact plastic. Store leftovers in glass jars or glass containers, avoid heating food in plastic, and use stainless steel or glass for warm drinks when you can.