Looking at the products at GNC your pretty limited. As the person above said exercise well, but this has to be combined with a supportive diet. It depends what you mean by muscle and also your body type will also influence the effect you may desire. GNC has a limited selection of protein products and I think I remember seeing some products which help maintain muscle when you have an intense exercise regime, but these products are nothing unless you have the knowledge on how to combine them with a compatible lifestyle. Your better off to spend money getting a series of personal trainer sessions and or go join a gym on a casual/short-term basis that will give you a free initial assessment. If your serious hardcore bodybuilding type then you'd be better to order off an online site, as GNC don't sell in bulk at a reasonable price.
Looking at the products at GNC your pretty limited. As the person above said exercise well, but this has to be combined with a supportive diet. It depends what you mean by muscle and also your body type will also influence the effect you may desire. GNC has a limited selection of protein products and I think I remember seeing some products which help maintain muscle when you have an intense exercise regime, but these products are nothing unless you have the knowledge on how to combine them with a compatible lifestyle. Your better off to spend money getting a series of personal trainer sessions and or go join a gym on a casual/short-term basis that will give you a free initial assessment. If your serious hardcore bodybuilding type then you'd be better to order off an online site, as GNC don't sell in bulk at a reasonable price.