Zeus,
Probiotic Capsules: 50 billion CFU, 10 strains 2xweek.
It's important to get multiple strains and lots of little bacteria present, this one ^^ has 50 billion.
It's also goo to get a lot of fiber. Fiber is a PRE-biotic, it feeds them.
Additionally, I get probiotics from sauer kraut. Don't heat it or you'll kill the bacteria. Kimchi is also a good source. ...both are fermented foods. You'll want a cup of either when you eat it.
Yogurt doesn't have anywhere near the probiotics that are needed in one serving to make a difference however, Kefir is a good source.