Protein shakes are good & many have biotin & other nutrients that are good for your hair. Depending on the shake & your goals the shakes can help you with weight loss or gain. They aren't solely responsible for either as most shakes cannot replace a sound diet & exercise plan. HTH.
helps you lose weight and gain muscle.
i would try the protein shake. i dont see any harm in it. i used to make sure i got lots of protein when i was working out. since summer started i've been lazy. if it doesnt help your hair grow you're body will still benefit. oh and tell us about your results if you try it