I'm just now hearing of probiotics, since I've been researching my moms recent flare. What are they and where can they be purchased? It sounds like they have helped many people taking them.
Here is one source of information on probiotics nccam.nih.gov/health/probiotics/
You can buy them most anywhere (grocery stores, health food stores, online, etc.). Until probiotics become more standardized, the biggest challenge is finding a reputable brand that works best. I would look for brands that list the strains of species used on the label. The dose should also be clearly stated - usually in cfu's. My understanding is that a minimum of 1 billion cfu per strain is deemed necessary to be effective - preferably more.