I can only speak from personal experience but my blood sugars were running in the high 100's to 200's before I started Schwarzbein, even with 500 mg. Metformin twice a day. They're slowly going down, and now seem to stay in the 100 - 160 range. I'm hoping as I lose more weight they'll come down lower and eventually I'll be able to get off medication. I do know I feel better. I monitor my sugars closely and if they start getting too low I do eat more carbs, but I'm careful which ones I choose. Usually cheese and a couple of whole grain crackers.