Selenium Liquid 2 ozSelenium Liquid 2 oz Selenium is an essential component of various enzymes and proteins, called selenoproteins, that help to make DNA and protect against cell damage and infections; these proteins are also involved in reproduction and the metabolism of thyroid hormones. Supplement Facts: Serving size: 1 dropper Serving per container: 70 Droppers. 2oz Suggested use: one dropper sublingual, retain 15 seconds and swallow, or as directed by a physician.