What do you suggest if i would like to build muscle. when should i take whey and when should i take casein. when, should, i take both?

Whey vs. Casein: Whey is a byproduct of the processing of cheese. it is slower acting in the body. Casein comes from processing milk, it is quicker acting. Whey is best for post-work out, casein best for when you need longer-lasting nutrition, e.g., between meals or overnight. Here's a link also http://www.webmd.com/fitness-exercise/20110819/whey-protein-may-beat-casein-after-workouts Peace and good health.