I have the Oatmeal Stout Kit (w/ malt extract) from MidwestSupplies and I'd like to add either lactose or maltodextrin to it. From what I understand maltodextrin will increase mouth feel, body and head retention, while lactose will do the same while simultaneously sweetening the brew. I'd like to sweeten the beer a little but am more concerned with body, mouthfeel and head retention. Which one would be better, or can I combine them? I'll probably bottle in four or five days.