Also available in 1 mL, 10 mg, 25 mg, 50 mg, 500 mg and bulk. Please contact Fisher for quotes. Metformin (1,1-Dimethylbiguanide) is an AMPK activator with blood-brain barrier permeability. Metformin may improve glycemic control by increasing insulin sensitivity and decreasing intestinal glucose uptake, and is commonly used in type 2 diabetes research. Purity 99.77%