Some people may not be able to tolerate lactose, a milk sugar. One hundred percent of humans are allergic to casein, a milk protein. Eighty percent of the protein in Horizon's organic dairy products is casein, the same glue used to adhere a label to a bottle of beer. Eat casein and your body produces histamines, then mucous. This sludge congests your organs.
Organic milk contains just a little bit less of the same hormones.
I find very little difference between the two.