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Nanoplastics: How They Get Into Your Bloodstream Researchers have detected plastic particles in human blood. Evidence suggests that the smaller the plastic particle, the more likely it is to cross biological barriers and enter the bloodstream. Here's the current understanding: Particles larger than about 150 micrometers (µm) are generally not absorbed through the gut. Most pass through the digestive system and are excreted. Particles smaller than about 20 µm can be absorbed in small amounts through the intestinal lining. Particles below about 1–10 µm appear much more capable of entering tissues and the bloodstream, although only a small fraction of what is ingested is thought to be absorbed. Nanoplastics (typically defined as smaller than 1 µm , especially those under 100 nanometers (nm)) are considered the most likely to cross the intestinal barrier, enter the bloodstream, and potentially reach organs such as the liver, kidneys, brain, or placenta. Several important notes : The...