I also am experiencing success with Berberine.
After 5 weeks of 500mg/daily I had blood work and my A1C went down 0.3
I do time restricted eating and my diet consist of 95% meat/eggs.
At 58 y/o, 5"9' and 170 lbs nothing else I tried lowered my A1C until Berberine.
Looking forward to next blood...