Protein shakes provide an excellent source of essential amino acids after a workout.
Aching muscles begin to repair by growing new muscle fibers directly after your workout.
The best post-workout protein will depend on your needs. For most people, whey protein powder offers a complete protein which is rapidly digested.
Once you consume protein powder, your body goes to work breaking down and absorbing the essential amino acids contained within the protein.
The amount of protein powder you take after a workout will largely depend on the type and purity of the protein powder you have purchased.