Also available in 5 mg, 10 mg, 25 mg, 50 mg, 100 mg and bulk. Please contact Fisher for quotes. Glycogen phosphorylase-IN-1 is a selective and potent inhibitor of human hepatic glycogen phosphorylase (hlGPa) with inhibitory effects on hlGPa activity and on hepatocyte glycogen-derived glucose production, and can be used in the study of type 2 diabetes mellitus and canine lupus. Purity 98.01%