Absolutely. S. Boulardii is the real deal. When I was really sick, I always knew S. Boulardii was working because whenever I would take it, I would get WICKED GAS. I mean like the type of hot flatulence that could choke a horse. As I got better, S. Boulardii didn't give me nearly as much gas, until eventually, there was no change when taking it whatsoever.