I recently turned 75 years old and I am still active and working in health care. However, I had noticed a loss of muscle mass over the past couple of years. In addition, I have digestion issues and I have a problem with certain foods. I started taking the Advanced Amino powder to supplement my diet with additional protein about 5 months ago. Within 2 weeks, I noticed how fast my fingernails were growing. I was amazed because I have never been able to grow long fingernails. My hair and skin texture also improved. I began feeling stronger when walking or going up and down the stairs at work. This has made such a difference in how I feel overall. I increased my dose from once a day to twice per day. This product has been very beneficial for me and I couldn't be happier.