GC Agar supplemented with hemoglobin and BBL IsoVitaleX Enrichment (in place of yeast concentrate) provides an improved medium for the isolation of microorganisms Enrichment provides V factor (nicotinamide adenine dinucleotide, NAD) for Haemophilus species Also provides vitamins, amino acids, coenzymes, dextrose, ferric ions and other factors which improve the growth of pathogenic Neisseria