I've never tried the Bob's Red Mill dry milk. I've been using a generic dry milk that does have added vitamins without issue, so far. I've been using 2 cups a day for a few weeks now. Organic Valley non fat dry milk is another one that doesn't have added vitamins, yet it doesn't agree with me for some reason. I've been unable to find a skim or low-fat "fresh" milk at any store that doesn't have added vitamins. I always thought it was mandated. The fact that they don't have to do it, yet all do, is infuriating.