Microplastics Damage Your Blood Vessels and Bladder on the Way Out

Microplastics don't just pass through you harmlessly. A new study shows PET plastic fragments damage blood vessels and bladder cells on their way out of your body.

Not All Plastics Are Equal

Researchers exposed human blood to fragments of two common plastics: polypropylene (PP) and polyethylene terephthalate (PET). PET is what your water bottles and food containers are made from. It was three times worse, according to a 2026 study in J Hazard Mater.

PET fragments absorbed three times more blood proteins and red blood cells than PP. The PET particles formed a thick protein coating that made them sticky. They latched onto blood vessel cells and bladder cells at much higher rates.

Damage During "Harmless" Excretion

Once attached, the PET fragments triggered elevated reactive oxygen species and cell death markers in both blood vessel lining cells and urinary tract cells. The difference compared to PP was statistically significant (p < 0.01).

The assumption has always been that microplastics enter, circulate briefly, and leave through urine without doing harm. This study proves otherwise. Even during that brief transit, aromatic plastics like PET cause real tissue damage.

What You Can Do

Stop drinking from plastic bottles. Choose glass or stainless steel containers. Avoid plastic food packaging, especially for drinks. And start swapping to non-toxic home essentials to cut your plastic exposure.

Also see non-toxic kitchen essentials for safer alternatives.

Source: Lee Y, Heo SE, Park K, et al. (2026). J Hazard Mater.