Sodium selenate is an inorganic salt of selenium, an essential trace mineral. It dissolves in water, unlike organic forms such as selenomethionine, and your body absorbs it differently. You take it to back up your antioxidant enzyme system and immune function.
People take sodium selenate daily as part of their supplement routine. Swallow it with food to lower the chance of stomach upset, not to boost absorption. Your selenium needs depend on diet and health, so adjust your dose accordingly.
Selenium turns toxic in high doses. The inorganic form may have a narrower safety margin than organic selenium. Never exceed the suggested intake. Talk to your doctor before using it, especially if you are pregnant, nursing, or taking other supplements.