Personally, I think you may get tha most results by stacking 200mcg of Chromium with 20 mg Vanadyl Sulfate 3x a day with carb meals... I've used it with decent success before R-ALA became all tha rage with lowering blood sugar.
I know Chromium has been identified as a mutagen as well as toxicity reports, but I think you're fine as long as you cycle with with everything else, every 4-6 weeks.