I am thinking about putting together an English brown ale with nutella. I love nutella, but I have a couple concerned with actually using it in my brew. One it contains skim milk, veg oil, and fats from coco. Will this small amount of fat destroy my head retention? Second, I am not 100% sure if it has some sort of preservatives in it, an I know that could bring havoc down on the yeasties! I guess I am asking would it work?, or am I just better off using ground hazelnut, and coco powder? Thanks for your help guys!