Our antibiotic media prevents bacterial growth while stimulating the growth of mushroom mycelium. Contains the same powerful formulation as our standard Malt Extract Agar (agar, malt, yeast extract and peptone), but with the addition of an antibiotic. For those who have ex-pe-ri-enced the disaster bacteria wreak upon the spawn laboratory, this media is the solution. 50 grams are recommended per liter of water.