Animal Stak has long been built on being a complete muscle stack. Growth Hormone Support: 1500MG-Arginine Complex (Arginine HCl, ArginoCarn [Acetyl-L-Carnitine Arginate Dichloride]), Mucuna Pruriens (Seed) (Standardized for L-Dopa), SuperSerum, Sustamine, Alpha Glycerylphosphorylcholine (Alpha GPC).