The first group drank milk which included a species of 'lean bacteria' called Lactobacillus Gasseri. Another ingredient of LeanBiome, Lactobacillus Rhamnosus, is widely popular due to its various health benefits. Several studies have demonstrated the ability of these germen to improve the immune system, prevent gastrointestinal infections, eliminate allergic reactions, https://www.lean-biome.us/