Short of minimal amounts present in some multi-mineral formulations, the effects of supplementing higher amounts of vanadium on a regular basis - when not indicated - can have detrimental side effects that may include anything from various aches and pains and flu-like symptoms, to eventually vanadium causing all kinds of bizarre, chemical imbalances. Supplementing higher amounts of vanadium can also cause a very noticeable green discoloration of the tongue... Full Text