Originally Posted by nazzo

I've no experience with those packaged protein/creatine/whatever-fancy-sounding-chemical drinks on the market. The only justification in using those products sparingly is if the convince factor outweighs the added cost of the product for you. It would be cheaper to formulate your own post-workout drink then to buy that muscle milk product.
I'm not sure what the needs of an endurance cyclist's shake might be but I've been following at mix of 50g protein, 25g creatine, a serving of BCAA and ~25g sugar to help with the absorption of the creatine and to prevent catabolic loss after my weight training sessions.
Since aerobic exercises already stresses your body to go catabolic I'd figure that having a protein rich diet, especially immediately after a workout, would help promote fat loss without the loss of muscle mass.
I agree fully with OptionalStick3's post, I don't understand the hate that protein has gotten in this thread since it is a crucial part of any diet and supplements help balance out your daily needs.

You could also look into doing HIIT training to cut the fat without muscle loss.