Bulk Buy's Probiotic Complex is a blend of the 4 most researched strains of probiotics on the market. There are probiotics with dozens of strains added and there are products with only 1 strain. We've split the difference to provide maximal coverage of the strains that are most important without diluting out the benefit of the key strains. There included strains are Lactobacillus Acidophilus La-14, Bifidobacterium Lactis Bl-04, Lactobacillus Plantarum Lp-115, and Lactobacillus Paracasei Lpc-37). This is another staple of the bulk buy line that is an ideal daily supplement for the entire family.