Blends, flavorings, additives and all the things you can buy today and pay a lot of money for production and marketing is completely unnecessary. I think that there are good intentions of those who produce, but I can not believe that the industrial mixture can be better than the one that carp angler was made with his own hand (I am sure).
Today, in ordinary shops or warehouses which sell food for the animals can find everything you need, much cheaper. Important: basic mixture must be excellent, and this mixture we still use (depending on time of year) and flavorings, oils, color and taste. It is important that the mixture is good, so boilies not crumbling after cooking, not to be very soft, which can be regulated and the number of eggs in the mixture. Boilies, of any kind, purchased at 
the store have a nice color and smell of fifty meters in a circle, but try to remove them from the water after the half hour and you'll see that they have accepted the smell of the water. Boilies you've made are not so nice or even fragrant, but they are fresh, if you add all that is required (oil, natural flavorings, etc.), the smell will spread in the water much longer than the boilie from the shop. Boilies, with more than 30% of proteins very quickly induces satiety carp, so that they can not digest food very long time. This is the flavor that comes into his memory and will be reminder for him to a taste of boilie. He will avoid the taste when it was found again.
Everything that I have wrote so far is only my opinion, which was tested in the fishing, that does not mean that boilies bought at the store are not good for fishing, because I have used boilles from shops many of times.
