I am 83 years old and have lost a lot of muscle. I ordered Advanced Amino to see if I could regain some. I don't exercise as much as I did when younger but am responsible for keeping the house, yard, cooking, etc. myself since my husband can't do it any more. Haven't taken it as I should but am still trying - and will let you know if I succeed or even get a little muscle back. Love to play tennis, volley ball and ski (water & snow) so I'm going to keep trying.