I'm well into my 2nd bottle of Advanced Amino and I have been feeling stronger. I find I can get more exercise in and experience better muscle recovery (I'm 56). I used to do 30 minutes a day on average on my rebounder. I can now do an hour. I started off with 5 tablets a day for the first couple of weeks per the dosage instructions on the bottle, then I watched the video on the site where the recommended dose was 10 tablets a day for those over 120 lbs. I bumped it up and I feel this definitely made the difference. As a result, I will try the power for my next order. I am starting to see improvements in both my digestion and sleep. I am encouraged enough by how much better I feel, that I will continue to use this product.