Bacillus coagulans is a lactic aci forming bacterial species within the genus Bacillus. The organism was first isolated and described in 1932 and was elaborated in the fifth edition of Bergey’s Manual of Determinative Bacteriology. It was initially considered to be a spore-forming Lactobacillus. Since Bacillus coagulans exhibits characteristics typical of both genera Lactobacillus and Bacillus, its taxonomic position between the families Lactobacillaceae and Bacillaceae was often debated. However, in the seventh edition of Bergey’s, it was finally transferred to the genus Bacillus. DNA-based technology was used in distinguishing between the two genera of bacteria which are morphologically similar and possess similar physiological and biochemical characteristics.