Microplastics are just what the name implies….tiny bits of plastic from a myriad of sources, like washing fleece material in a washing machine for example. It’s been described as a problem affecting the food chain in oceans, but guess what? Around 90 percent of table salt brands were found to contain these (since I had of our salt comes from the ocean). So, we’re all ingesting these, not just marine life. Unfortunately, no one’s really sure what health risks, of any, this poses. Read this article for more on this: