I often hear people talking about probiotic yoghurt. It’s a bit of a pet peeve of mine as all yoghurt should, by its very nature, contain probiotics, not just the stuff marketed as probiotic.
Probiotics are simply the bacteria used to make the yoghurt. If you look at the label of your yoghurt container it should list “active cultures” in the ingredients. There are your probiotics. The types of bacteria present in each brand of yoghurt vary and, unfortunately, we don’t know which are the most beneficial. There have actually been very few studies on the benefits of these probiotics. Despite the lack of research into the specific microorganisms present in yoghurt, we still know that, at the very least, low-fat yoghurt (preferably plain or at least sugar-free) is a good source of protein and other nutrients such as calcium.
Don’t feel compelled to choose the special probiotic yoghurt. Go with the brand you prefer as you’ll be getting probiotics regardless of marketing.