From what I understand you need protein in order to build muscle. I think the rule of thumb is to consume 1 gram of protein per pound of body weight. So if your son was 160lbs-160 grams of protein to build muscle. If his shakes were 30 grams each and he drank 3 per day then he'd could get the other 70 grams from his food intake. I've taken them for years and from what I read they are very safe.
Right, and I'm not married to the brand, it's just what my DS asked for and I thought people might recognize the name and then be able to give me advice on the subject.I think it is way overpriced, and you can get at least as good nutrition from any of the big name whey protein powders, but the powders are usually far less expensive.
Muscle Milk sure sounds impressive from a marketing standpoint, though.