There is selenium in the Mutlivitamin and Multimineral supplement I am taking. It doesn't have any negative effects on me. Some people can't tolerate it. Selenium in and of itself is toxic in high enough doses, but in normal levels its used to help make glutathione, the body's own defense against metals and many free radicals. I'd say if it doesn't bother you, its probably good to take it as it may help your body detox on its own. Anyhow, keep us updated on how you are doing...