Douglas Laboratories Seleno-Methionine Support for Antioxidant Activity and Immune Health Selenium is a natural antioxidant that supports the immune system and healthy blood flow. Ingredients Serving Size: 1 Vegetarian Capsule Amount/Serving Selenium (as selenomethionine) 200 mcg Other Ingredients: Microcrystalline cellulose, hydroxypropyl methylcellulose (capsule), and ascorbyl palmitate. Gluten-Free, Non-GMO Suggested Use As a dietary supplement, adults take 1 capsule daily or as directed by your healthcare professional. Warning: If you are pregnant, nursing, have any health condition, or are taking any medication, consult your health professional before using this product. Keep out of reach of children. Use only if safety seal is intact. Storage: Store in a cool, dry place, away from direct light. More Info. Selenium protects normal cell function by supporting the body’s natural defenses and scavenging free radicals. It serves as an essential cofactor for glutathione peroxidase, thioredoxin reductase, and various selenoproteins that maintain antioxidant defenses. Selenium is also essential for iodine metabolism and thyroid hormone production. Selenium is required for the production of certain prostaglandins, which promote healthy blood flow. In addition, several clinical trials report that supplementation with selenium provides support for the immune system.