Bio-Selenium Plus is based on the latest antioxidant research. Selenium works synergistically with vitamins B6, C, and E, as well as with the mineral zinc, in contributing to the protection of body cells from oxidative stress.The selenium content in European soil may vary from country to country. A well-balanced diet with selenium is needed for supporting the selenium-dependent proteins involved in normal immune function, a well-functioning thyroid gland , and other important selenium-dependent functions.Bio-Selenium + Zinc contains SelenoPrecise, the patented, organic selenium yeast with excellent high bio-availability (88.7% absorption) and safety records.1-2 tablets per day, or physician. To be taken with food. Sugar and gluten free