Vanadium?

Some of the books I've purchased about diabetes recommend the supplement vanadium, said to be useful in lowering glucose levels and helpful in increasing insulin sensitivity for Type 2 diabetics. I did a quick Google search and decided not to purchase supplements. Research is scanty on humans and there seem to be serious risks of toxicity.

Links about vanadium

http://ezinearticles.com/...Diabetes?&id=1062629

Vanadium in diabetes: benefit or harm?, by John Walsh, covers vanadium and other trace minerals in diabetes.

http://www.diet-and-healt...upplements/Vanadium.html

Food sources rich in Vanadium

eggs

black pepper
dill seed
parsley

olives
olive oil
sunflower oil

apples
buckwheat
oats

shellfish

radishes
mushrooms
soy
corn

Comments/further information appreciated!