21st Century Selenium 200 mcg offers benefits such as antioxidant protection, immune system support, and improved thyroid function. It acts as a powerful antioxidant that helps protect cells from damage, supports the immune system, and is crucial for the proper functioning of thyroid hormones and metabolism. 
Key benefits
Antioxidant protection: Selenium is a potent antioxidant that helps protect the body's cells from damage caused by free radicals, which are unstable molecules linked to cellular damage.
Immune support: It plays a role in strengthening the immune system.
Thyroid health: Selenium is essential for the synthesis and metabolism of thyroid hormones and supports proper thyroid function and metabolic balance.
Heart and cognitive function: It is believed to support heart health and cognitive function.