Selenium is a mineral that occurs naturally in soil and seawater. Most people easily obtain the recommended amount of selenium from food. The highest sources of dietary selenium are fish and meats, including tuna, shrimp, salmon, turkey, chicken and beef. Non animal sources, include whole grains, nuts and seeds.

Selenium supports thyroid function and antioxidant activity.

Recommended Daily Allowance: 55 micrograms daily
Safe Upper Limit: 400 micrograms daily