This probiotic strain (Lactobacillus plantarum LP-299V) is sold by just a few brands: Solgar, Jarrow Formulas, Good Belly, and Nature's Bounty. This is the best bang for the buck and I appreciate Solgar's using of real glass and metal tops. It's really the Cadillac of the bunch. I use this for IBS and it never disappoints. It's really one of my essentials that I take every day. I don't know whether it will be the right thing for everybody, but it sure works exceedingly well for me. Far superior to any other remedy I have tried--and I have tried a lot of them. Highly recommended.