I take 500 mg/day of Metformin voluntarily.
A1c remains flat at 5.0% (now measured only every 6 months).
AM blood glucose (by the strips) averages 70 (clinical blood analysis is more like 80). All other measures are dead-on normal (too).
I average 1050 calories a day – 60 g fats, 70g carbs (15g fiber, 18g added sugars), 55g protein and 900 mg sodium