Someone once advise me to add powdered milk for feeding calves to the paste, made with egg and ground pellet, wrapped around pellets when fishing for barbel. Yes, it caught fish, but as usual, you couldn't say whether it made a real difference. Mind you, it does sometimes seem that the more effort you put into making/flavouring etc your own bait, the harder you try to catch on it, so there may be an indirect advantage to it.