My partner has been consuming the berry banana high protein powder on his cereal and yoghurt every morning since he had loss of muscle on his left arm caused through a neck injury. It was unlikely that surgery would have any reverse effect to regain muscle. He had surgery but had started consuming the protein powder a considerable time before surgery. He has regained a significant amount of muscle mass and I believe that the protein powder along with the exercises and surgery has helped considerably. It is anecdotal but there were mild changes occuring before the surgery with physio and the added protein to his diet. He continues to enjoy the powder in this manner on a daily basis.