Hi, I am having the same problems on the Renew Life Ultimate Flora - 50 billion - major gas and horrific gas pain, nausea and increased reflux. Everything I've read tells me it's from candida die-off that is being caused by the probiotics. Also, they do not contain FOS. They stopped using it some time back. And they are dairy and gluten free. I am so miserable right now and I want to stay on it, but the pain is miserable. I have not had die-off like this ever.