"Vanadium is a trace mineral that is found in many foods. Scientists aren t sure, but your body may need vanadium in tiny amounts. It may be involved in normal bone growth. However, scientists aren't sure exactly what effects vanadium may have, or what amount might be helpful. They do know high doses of vanadium may be unsafe. Most of the studies using vanadium have been animal studies. Only a few clinical trials involving humans have been done. Because of that, vanadium isn't recommended for any disease or condition. However, it may have an effect on blood sugar in people with diabetes."

"DRI Tables"

"Recommended Dietary Allowances (RDA) - The daily dietary intake level of a nutrient considered sufficient by the Food and Nutrition Board to meet the requirements of 97.5% of healthy individuals in each life-stage and sex group. It is calculated based on the EAR and is usually approximately 20% higher than the EAR. ... Tolerable upper intake levels (UL) - To caution against excessive intake of nutrients (like vitamin A) that can be harmful in large amounts. This is the highest level of daily consumption that current data have shown to cause no side effects in humans when used indefinitely without medical supervision."