There used to be a bit of a trend for dairy-based boilies for barbel, iirc. I sometimes make a paste/pellet wrap with egg, ground pellet, fishy stuff (anchovy paste; comes in a tube like toothpaste) and dairy (calf milk powder scrounged from a farmer's daughter). There's one FM member who will point out that a sandwich with cheese on crusty bread contains two good barbel baits and he catches plenty. I've hardly used a big pellet or boilie for barbel in years - they seem to like meat, often flavoured up and in modest size bits, better. Ok, it can't be rigged to stay on for hours like boilies and big pellets, but I don't do that kind of fishing, so a softer bait is no problem.