I'm not an expert at all, but I have friends who brew and a relative who used to work at Anheuser-Busch, so have picked up a little along the way. The smallest batches of beer I have ever seen are home-brewed, and come out to at least a couple of cases. I would think that as it's an actual brewery, it's a vat at a time, so much, much more than those couple of cases. 16 ounces of yogurt in all of that beer, I would think, would be fine for lactose intolerance, since it is a minute amount. But for an allergy, I would guess it is at least as much protein as traces from cross-contamination, maybe more. So if it is allergy, or an allergy is a possibility, it would probably not be safe.