Can 16 year old girls use whey protein in their diet to build some muscle?

It depends on your body type and how hard you excercise. You're not going to develop huge muscles over night so if you start to look like Bo Jackson, just ease off on the exercise and protein program. Especially if you're white and you start to look like Bo Jackson. Then that's just weird.

Yes they will help, as long as you dont go taking other suppliments that will turn you into looking like a man, make sure you have a good understanding about the things you take,listen to what your health store tells you, as I wonted the same for my son who plays footie, but she wouldnt give me some items as they are no good for him, so make sure your health store is selling you the stuff for your needs and not theres as in dollars, as some of these items are very exspensive

all depends on how u work out try not to lift past ur weight so take your weight and multilpy it by .18 or somthn close so all your liftn is a fraction of ur weight this builds strength and tones ur arms or what ever ur workn on

no

u will just get hyper!