Vanadium is a trace mineral you get from some foods. It is also sold as a supplement, mostly for its proposed effects on glucose and insulin function. Common forms include vanadium chloride, ionic vanadium, and vanadyl sulfate.
Doses differ depending on the compound you use. Taking it with a meal can improve absorption. High amounts may upset your stomach or affect your thyroid.
Evidence for its effects on blood-sugar metabolism is mixed.