Probio7 Professionals AB21® contains 4 live strains of clinically researched bacteria Lactobacillus plantarum KABPTM 033, Lactobacillus plantarum KABPTM 022, Lactobacillus plantarum KABPTM 023 and Pediococcus acidilactici KABPTM 021. Each capsule provides 2 billion bacteria. This has been complimented with vitamin D which contributes to the normal function of the immune system.