Can microplastics from plastic bottles and containers impair male sexual function?

What's actually in it

PET (polyethylene terephthalate) is the plastic in water bottles, food containers, and beverage packaging. PET sheds microplastics into food and drink, especially when the bottle is heated, scratched, or aged. These particles enter the body through the digestive tract and distribute to tissues throughout the body, including blood vessel walls.

Erectile function depends on healthy blood vessel signaling. Smooth muscle cells in blood vessel walls must relax in response to nitric oxide to allow blood flow. Anything that damages the vascular endothelium (the inner lining of blood vessels) or disrupts this signaling impairs function.

What the research says

A 2026 study in iScience exposed animals to PET microplastics and found they caused measurable impairment in erectile function. The mechanism involves macrophages (immune cells) that accumulate around PET particles and activate a pathway called cGAS-STING, triggering inflammation and ferroptosis (a form of cell death) in vascular tissue.

The cGAS-STING pathway is normally an antiviral defense mechanism. PET particles activate it inappropriately, causing macrophages to attack healthy vascular tissue. This damages the endothelial cells that must function properly for normal blood flow regulation.

This is animal research, not a clinical study in humans. But the mechanism is real and involves human-relevant pathways. PET microplastic exposure in human blood vessels has been documented, and the same cellular pathways exist in human tissue.

Switching from PET plastic water bottles to glass or stainless steel removes the main daily PET microplastic source. Avoiding reuse of single-use PET bottles and never heating food in PET containers reduces exposure from the containers that degrade fastest.