I received Muscle Tech Nitro-Tech 100% Whey Gold as a free sample. I switched fro my normal to the free sample and was very surprised by the increase in energy, mixture, and great taste. I took the recommended dosage throughout the day and after my workouts. The first two weeks my recovery times decreased and I have gained 2 lbs of lean muscle mass. This is by far the best Whey I have tried in 10 years and I plan to keep using it after my sample is gone. Another great product by Muscle Tech.