The bacteria in the Yogourmet yoghurt & Creme Bulgare starter are: bulgaricus, thermophilus, and acidophilus. They also make a starter called CBA which is not recommended for the SCD™.

t writes:
In the case of bifidus, it has a tendency to overgrow. Each type of bacteria has different properties, different byproducts... I usually think of it in terms of different levels of tenacity and agression. Your gut is truly a multicultural society - some member are more altuistic, and others are criminal. Some are interested in improving the neighbourhood, and some are only out for themselves.

L. Acidophilus is about as community-minded a bacterial strain as you will find, with S.Thermophilus and L.Bulgaricus running a close second. The others are either less friendly, or are unknown quantities. It gets even more complicated if you consider soil based strains.

So we stick with Acidophilus in our supplements, and Acidophilus, Thermophilus and Bulgaricus in our yoghurt, because they are good neighbours.