Microplastics, tiny plastic particles 5mm down to 1 nanometer in size, often breaking down further into nanoplastics, are ubiquitous environmental pollutants derived from sources like degraded plastic waste, synthetic textiles, tire wear, and cosmetics. They enter the human body primarily through ingestion (via food and water), inhalation (from air), and to a lesser extent, skin absorption. Once inside, they can circulate via the bloodstream and accumulate in various organs and tissues. Presence and Accumulation in the Body . Research has detected microplastics in numerous human tissues, including blood, lungs, liver, kidneys, spleen, placenta, breast milk, and even bone. A 2025 postmortem study analyzed tissues from decedents and found concentrations ranging from hundreds to thousands of micrograms per gram in organs like the liver and kidneys. Polyethylene (PE) was the most common type identified, often appearing as nanoscale shards or flakes. Inhalation appears ...
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