GC Agar is used with various additives for the isolation and cultivation of pathogenic microorganisms such as Neisseria gonorrhoeae, Haemophilus influenzae and N. meningitidis. Enzymatic Digest of Casein and Peptic Digest of Animal Tissue provide nitrogenous compounds and vitamins. Corn Starch is a source of carbohydrates. Mono- and Dipotassium Phosphates serve as pH buffers and Sodium Chloride maintains the osmotic equilibrium. Agar is the gelifying agent.