Bacillus clausii, also known as B. clausii, is a probiotic strain that has gained popularity in recent years due to its therapeutic potential. However, there are several other terms used to refer to this microorganism. Some of the synonyms for B. clausii include Clostridium sporogenes, Bacillus subtilis var. natto, Bacillus subtilis var. globigii, and Bacillus sporothermodurans. These terms are often used interchangeably to refer to the same bacterial strain. Regardless of the term used, B. clausii has been proven to have beneficial effects on the gut microbiome, immune system, and general health. It is often used as a treatment for antibiotic-associated diarrhea, irritable bowel syndrome, and other digestive disorders.