Descriptions of Selenium and Selenium-enriched Yeast: 1. Functions of Selenium: Selenium is of fundamental importance to human health:   (1) As a constituent of selenoproteins, selenium has structural and enzymes roles; in the latter context being best-known as an antioxidant and catalyst for the production of active thyroid hormone.   (2) Selenium is necessary for the proper functioning of the immune system, and appears to be a key nutrient in counteracting the development of virulence and inhibiting HIV progression to AIDS. 2. About Selenium-enriched Yeast: Selenium-enriched yeast is a high potency, 100% organically bound Selenium Yeast product. As a natural nutritional food source, yeast replicates the mineral conversion process performed by most plants (i.e. garlic, broccoli). This natural plant process converts inorganic (low bioavailability, potentially toxic) minerals to safer organic (high bioavailability) forms for improved nutrient utilization. Characteristics of "Angel" Selenium-enriched Yeast: 1. High selenium content: up to 2000mg/kg; 2. High activity: the organic selenium in the yeast is more active and more effective; 3. High absorbability: the organic selenium is easier to be absorbed by human body; 4. Low toxicity: the toxicity of the organic selenium is lower than inorganic selenium; 5. Selenium-enriched yeast, if matched-use with other Angel nutritional yeasts like Chromium-enriched yeast, Zinc-enriched yeast and Yeast Beta Glucan, will have a better healthy improving function.