I have improved balance, better strength when walking upstairs and down, clarity of mind, my muscle aches have lessened, and I recover better on the days when I push my exercise routine. I am a swimmer, and have increased endurance in the pool which I never expectEd that I would. Took a blood test before starting the amino supplements, and checking with my doctor continually. My improvements are real. I’ll be 66 in a few months and I’m really glad I found this product. Would highly recommend. My doctor says to make sure to drink a lot of water when taking the supplements. That I am doing! I’m taking them as per the Advanced Bionutritional recommendation.. I could not be happier at this point.