Solaray Selenium Extra Strength provides 200 mcg of selenium per serving in 100 vegetarian capsules. Selenium is an essential trace mineral that plays a role in various bodily functions, including antioxidant defense. This extra-strength formulation offers a higher potency option for those seeking selenium supplementation. The capsules are vegetarian, making them suitable for those following plant-based diets. Selenium is naturally found in foods like Brazil nuts, seafood, and whole grains. It's important to be mindful of total selenium intake from all sources, as both deficiency and excess can have health implications.