Go with whole food proteins or quality whey shake. Make sure you know what you are eating, Cliff is probably one of the highest rated ones, so two bars would be fine along with normal meals. Whey protein is a naturally complete protein, meaning that it contains all of the essential amino acids required in the daily diet.
Whey protein is a rich source of branched chain amino acids (BCAAs), containing the highest known levels of any natural food source. BCAAs are important for athletes since unlike the other essential amino acids, they are metabolized directly into muscle tissue and are the first ones used during periods of exercise and resistance training.
Whey protein provides the body with BCAAs to replenish depleted levels and start repairing and rebuilding lean muscle tissue.
