I like Yorker Health’s probiotic with 40 billion CFU. Also I like the fact that product will guarantee at least 20 billion CFU until expiration date. This is very critical to know about this product. Most of the other probiotic products lose their effectiveness due to loss of most of the critical probiotic strains. Also this product has most critical probiotic strains one needs to looks for such as Lactobacillus acidophilus (La-14), Bifidobacterium lactis (Bl-04), Lactobacillus plantarum (LP-115), Lactobacillus paracasei (Lpc-37), and Marine polysaccharide Complex Fructooligosachharide. I highly recommends Yorker Health’s probiotic.