Of the Berberine? I take around 1,500 a day, divided into 3 dosages.
Keep in mind that my goal is not to stay on both. After my next doctor's appointment, I want to test what happens if I give up Metformin all together and just stick with Berberine. I do recommend doing some research to find a quality brand. (I have been happy with Solaray, but their may be better options out there.)