Berberine is Superior to Metformin 黃連素比二甲雙胍要好～link

A new review focuses on several studies showing that the plant alkaloid berberinecan lower blood glucose as effectively as the drug metformin at similar doses (500 mg, taken 3 times/day), and perhaps even better in some ways.

http://www.life-enhancement.com/magazine/article/2439-berberine-is-superior-to-metformin