2012/01/25, 09:22 AM
Hi and welcome to the community!
When you mentioned you do not want to add "weight" I will assume you mean fat? Supplements do not make you gain fat, it's what you eat that makes you gain fat.
The best choice for an overall supplement that will help you gain lean muscle mass, tone and lose fat is whey protein. Protein helps recovery, repair and grow new lean muscle tissue, and with more muscle mass your body burns more fat.
A good option is
Optimum Nutrition 100% Whey Protein