Which came first, the yogurt or the acidophilus? ;-) Lactobacillus acidophillus produce yogurt......and vice-versa. But it's part of normal intestinal flora- and it's particularly good at metabolizing lactose, so it might well decline in a dairy free diet. It can also be killed by antibiotics and outcompeted by other organisms so supplements of it can be helpful- I suppose "normal" would be what is found in a person on a SAD. Do you have any statistics of non-dairy groups, of what their flora is, and whether it's even necessary or helpful, if one has no need for lactose? ` [log in to unmask]