I have never (and likely, will never) use Ovaltine in a beer but I did make a Grape Nut Brown Ale once. It turned out pretty well. I really couldn't pickup much from the Grape Nuts but the novelty got people to try it. Paul
Sugar, maltodextrin, toasted defatted soy flour, barley malt extract, whey, and a bunch of other stuff.I'm curious to know what kind of attenuation you can get out of it.