"(CNN) -- If you use exfoliating soaps, you might not know those little beads may be made of plastic -- or think about what happens to them when they go down the drain. But it's on the minds of marine science researchers, as well as a major company." "...Research in microplastics suggests that very small particles, even tens of microns in diameter, can be retained in the tissues of marine invertebrates, Thompson said. A 2008 study from Thompson's group found that microplastic particles remained in mussels for 48 days." http://www.cnn.com/2013/01/07/health/microplastics-soap-unilever/index.html?iref=allsearch Easy enough to avoid these products when possible just in case.