Sabouraud Dextrose Agar is a general purpose medium used for the cultivation and isolation of a wide variety of yeasts and molds. The low pH promotes the growth of these fungi while simultaneously being slightly inhibitory to competing bacteria that may be present in a sample. Further selectivity can be achieved through the addition of antibiotic supplements.
The media includes peptone to provide nitrogen and vitamins for the yeast and mold. Dextrose is included at a very high concentration to provide a carbon source for energy. Agar serves as the solidifying agent.