http://www.stormsupplements.com/protein-muscle/

The amount of protein should I take if I want to gain muscle?
I have 15 years and I work 3 times a week (strength), there are over a benefit if I get a lot of protein my muscles grow faster than if you do not have much protein it is possible for me to lose muscle mass
that's how you know how u need a lot of protein a day … or find your weight in kg (lb when used or to measure the weight of dividing weight in pounds 2.2) can so that your answer is your weight in kg. u multiply that number by 0.8 if u are lazy, active, not 1.4 If you exercise and 1.8 if you try to muscle injury and / or exercise like crazy. the answer is the number of grams of protein needed or in a day. despite what some people say that 1 gram of protein per kilo of body weight too. your body can not break well, and can cause long term liver damage. good luck
Protein Shake – Build Lean Muscle – Great for P90X!