Thanks for your response. She uses casein on workout days because, according to TC, it's a better muscle builder and fat burner than whey, and the dextrose is absorbed into the bloodstream almost instantaneously. Her high-quality whey has lots of immunoglobulins, which is necessary considering her age. Her weight is about 140 lbs. (64 kg), so we figure her protein requirement is about 64 gms. per day, which she usually reaches with a diet of fish, eggs, other dairy and nuts, as well as good carbs and lots of vegetables. Her workouts average 75 minutes, and she walks most days.