i'd just use berberine in the 500mg to 1.5 gram amount. it's proven to be at least close to metformin, if not equal/better in some ways. i don't compete, but i can't recall hearing competotors saying "i take metformin and.....) i could be wrong though. i mean, how much more "gda" is going to happen by taking a "kitchen sink" vs properly dosed berberine? get a glucose meter and take a 90-120 minute post prandial reading after trying each (everyone doesn't respond identically) at most you just waste one bottle of kitchen sink money - and you'll know for sure.