Do protein shakes and supplements work?

Yes: They are supposed to give your body a source of protein. Your body incorporates them into muscle if you also workout and stimulate your mucsles. Just eating them without excercise wont work well.

No: I disagree with dr chao.There is no research available that demonstrates that they do work at all for endurance, performance and " replacing" muscle mass.And potential for serious side effects is very high. Not worth the expense or effort.