Didn't say the supplements repair your muscles. Said they help in building muscle mass. If he uses the supplements along with his workouts and changes up his food intake of lean protein he will be fine. I don't take those supplements, I see what my buddies at MMA do.

Also Rob, do NOT eat more protein than your body's weight. It can actually hurt you more than be beneficial.

If you need nutrition advice go to that site.
A guy at my work who is a former Marine is bodybuilding and he is all muscle (11% body fat). His advice is smart eating and take the right supplements to be cohesive with your workouts.