The brand name of the product I take is "Sotalix Berberine Supplement." It contains both berberine and Ceylon cinnamon and is in capsule form.

Info online about a berberine study: "It was found that hypoglycemic effect of berberine is comparable to that of metformin. The level of hemoglobin A1c (HbA1c), fasting and postprandial glucose decreased by 7.5%, 6.9% and 11.1% respectively at the end of the trial."

My doctor allowed me to switch from metformin to berberine years ago, but I, of course, can't know what would be best for you.