I've used this product for about five months now and can't say enough about the positive effects it has had for me. I'm almost 55 and say that because if you're "of age" you'll know that I just don't recover that easily anymore. Using Advanced Amino, I can workout harder, for longer and not feel my age later than life without it. My muscle mass (not that I'm a body builder but I can see the difference) is also gaining and not subject to the whims of weight training as before. For me, I feel more energized and ready to go using Advanced Amino. Regardless of your age, but especially if you are not young, try it. You'll quickly see why I wholeheartedly recommend Advanced Amino.