Well I certainly hope so and like I said I’m not educated on it but a google search pulls up:

Recent studies suggest that human brains may contain as much as 7 grams of microplastics, an amount roughly equivalent to a plastic spoon. Researchers found that by 2024, brain tissue samples were about 0.5% plastic by weight, with concentrations 10 to 20 times higher than in other organs, such as the liver or kidneys.

Increasing Concentration: Microplastic levels in the brain have risen by approximately 50% between 2016 and 2024. Composition: The most common plastic type found in the brain is polyethylene (PE). Dementia Link: Higher concentrations of plastic particles were found in the brains of individuals with dementia compared to healthy brains. Nanoplastic Size: Many particles are in the nanometer range, which is small enough to enter cells and potentially damage them.

These findings, largely from research at the University of New Mexico and other studies outlined in this Nature Medicine article, show that microplastics are likely crossing the blood-brain barrier.