GC Agar is used with various additives for the isolation and cultivation of pathogenic microorganisms such asNeisseriagonorrhoeae,HaemophilusinfluenzaeandN.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.