Ok so I now own a tub of casein protein, whey protein and whey protein isolate. I purchased the casein because I read that it is a slower burning protein and is good to take before bed. I normally just use Optimum Whey protein in the morning and post workout. I purchased the Ironlab whey protein isolate because I read that it doesn't have any lactose in it. My brother in law is lactose intolerant. So what is the difference between all these proteins? Do I have casein right? what is the difference between isolate and regular protein powder. I personally like the taste of the isolate better then all the others.