If you are training hard and want to gain muscle I would take 5gm creatine with 40gm dextrose carbs, 5gm glutamine, and 10gm BCAA POST WORKOUT. You could just buy kool aid powder or AST SPORTS SCIENCE and NOW FOODS both sell dextrose. Its a fast carb but still natural unlike high fructose corn syrup, and wont bloat your stomach like Waxymaize. Its also cheaper to get it seperate, but if you would like convienance. Optimum nutrition and a couple other brands sell good post workout formulas, but I would still purchase USP LABS MODERN BCAAs.