I've been taking Advanced Amino for over a year now. As the manufacturers suggest, I've seen an increase in my energy levels and muscle mass. The muscle building may be due to the added protein-production ability, but also due to the fact that I can exercise more regularly and put in more effort. I've also found that it helps me to recover more quickly from exercise and reduces soreness. I used to be very stiff in the quads, and also felt that I had to protect my Achilles tendons when running as they always felt tight. This stiffness and tightness have disappeared since using this product. Another thing I have noted – I haven’t had any illness in the past 12 months. There is no way to prove Advanced Amino played a role in this, but in theory it could have. If you're looking for a way to boost your health and vitality, I highly recommend giving Advanced Amino a try. I’ll be continuing to use it.