The 5 billion puhdas+ lactic acid bacteria contain an effective combination of four bacterial strains studied, with a total of hundreds of clinical studies behind them. One Pure + Lactic Acid bacterial capsule contains billions of Lactobacillus rhamnosus, Bifidobacterium lactis, Lactobacillus reuteri and Lactobacillus casei - without unnecessary additives and fillers! The product also contains zinc, which promotes the normal functioning of the immune system.