Nanoplastics Were Found Inside Human Kidney Stones

Scientists cracked open human kidney stones and found nanoplastics inside them. Then they proved the plastic helped form the stones in the first place.

Plastic Inside Kidney Stones

A 2026 study in Part Fibre Toxicol analyzed real human calcium oxalate kidney stones and detected polystyrene nanoplastics and other microplastic components embedded inside them.

Then they tested what those nanoplastics actually do. The answer: they make kidney stones form faster and cause more damage on the way.

How Nanoplastics Build Kidney Stones

In the lab, nanoplastics changed the shape of calcium oxalate crystals, making them clump together more easily. They also helped crystals stick to kidney cells more aggressively.

Combined exposure triggered ferroptosis (iron-dependent cell death) and recruited inflammatory immune cells to the kidney tissue. The nanoplastics suppressed protective enzymes (xCT and GPX4) that normally keep cells alive.

Confirmed in Living Animals

Rats exposed to nanoplastics through drinking water while developing kidney stones had more calcium oxalate deposits, more ferroptosis, and worse inflammation than rats without nanoplastic exposure.

What You Can Do

If you're prone to kidney stones, reducing nanoplastic exposure matters. Filter your water. Avoid plastic bottles, especially in heat. Don't microwave food in plastic. And check out non-toxic home essentials to cut plastic exposure throughout your home.

Also see non-toxic kitchen essentials for safer alternatives.

Source: Su et al. (2026). Part Fibre Toxicol.