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L-SelenomethionineAntioxidant SupportDietary SupplementIf you’re trying to find one of the most effective selenium supplements available today look no further than Swanson Selenium. Selenium has potent antioxidant qualities that help protect against cellular damage from free radicals. This important trace element promotes heart thyroid immune and prostate health. Each single-capsule serving delivers 200 mcg selenium as L-selenomethionine.