EM•1 (EM•1 Microbial Inoculant) is a liquid ferment containing three (3) groups of microorganisms: lactic acid bacteria, yeast, and photosynthetic bacteria. In the North American version of EM•1, the lactic acid bacteria group consist of Lactobacillus casei, Lactobacillus delbrueckii, Lactobacillus fermentum, Lactobacillus plantarum, and Bacillus subtilis. The yeast is Saccharomyces cerevisiae. The photosynthetic bacteria is Rhodopseudomonas palustris.