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Ingredient:

Vanadium

Vanadium is a trace element found in foods such as mushrooms, shellfish, black pepper, parsley, grains and grain products. The absorption of ingested vanadium is less than 5 percent 1.
  A biological role of vanadium in humans is unclear. Therefore, neither a Reference Daily Intake (RDI) nor a Daily Reference Value (DRV) has been set by the U.S. Food and Drug Administration (FDA).

References

  1. Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, D.C.: National Academy Press, 2002.