It's the No. 1 rule in bodybuilding: Don't short-change yourself on your protein intake. Why? Protein not only creates energy, but promotes muscle synthesis and recovery after workout. As a general rule, you should be eating about 1 gram of quality protein per pound of bodyweight. Because this macronutrient is essential to every bodybuilder's arsenal, but can sometimes be hard to intake in large enough quantities, it's no surprise there are dozens of types from which to choose. Among hardcore athletes, whey protein has long been favored for its anabolic power and potency. Studies show that whey protein found in ProSource's NytroWhey Ultra Elite, MuscleTech's Nitro-Tech Hardcore Pro Series and Optimum's 100% Gold Standard Whey is easily digested and utilized by the body, rich in amino acids and can boost the immune system. For bodybuilders looking for even-faster alternative protein sources, the new whey hydrolysate formulations consisting of partially digesting whey protein aminos designed to spur anabolism almost immediately upon digestion, are an excellent choice. BioQuest's MyoZene Ultra Pro and MuscleTech's premium proteins offer plenty of rapid action bang for your buck. Other products? protein sources include egg albumin, calcium caseinate and milk protein isolate. With so many quality options on the market, your decision may simply come down to your palate the competition for gourmet, milkshake-like flavors and consistency is equally fierce.