Butter is made by churning fresh or fermented cream or milk. I agree that butter made from fresh cream may contain some traces of lactose, around 0.4-0.6g per 100g. But butter made from fermented cream most likely will have none. With that said, would less than 1 g of lactose be enough to trigger onset of any intolerance? I doubt it.
The amount of casein in butter is minimal and can often be tolerated without a problem even by individuals who are highly sensitive to milk and other dairy products. 100g of butter has about 0.8g of total protein. If casein made up about 80% of that, it would be less than 0.7 of a gram. I don't think that amount could be problematic.
Whatever the amount of lactose and casein that remains in raw fermented butter, some people can't tolerate them.
If you're concerned about growth hormones. Organic butter is free of the potentially dangerous pesticides, antibiotics, and growth hormones that can be found in conventional butter products.
No, I am talking about naturally occurring hormones in milk that butter concentrates : Insulin, IGF-1, Betacellulin (BTC), Estrogens (particularly Estrone Sulfate), Precursors of Dihydrotestosterone (DHT) :
http://www.articlesbase.com/health-articles/hormones-in-milk-part-1-876841.htmlThere are some past issues of thepaleodiet newsletter that discuss the dangerous "hormones in milk". Maybe someone has the links ?
AGEs may be formed external to the body (exogenously) by heating (e.g., cooking) sugars with fats or proteins; or inside the body (endogenously) through normal metabolism and aging. RAW butter does not contain Advanced Glycation End products.
Well, Olive oil contains a high amount of AGEs. It is (at least in France) always cold extracted.
Pasteurized butter is one of the food that contains the most AGEs.
The amount of AGEs in raw butter is probably not as high, but I would not be surprised that one can find a non-negligible quantity, unless you have some evidences for the contrary ?