My Dr. put me on Co-Q10 several years ago. Said it was necessary as the body didn't produce much as we got older. Some Drs. think your body doesn't need much as you get older so it's just a part of aging. I can tell a big difference when I forget to take it for a few days. The brand he recommended is found at Walmart or Sam's Club. Qunol Ultra CoQ10 Softgels. More is absorbed in the body and not wasted. It's in a black box. I take one every night. It's a must if you are on any statin drugs. Statin depleats Co Q10 fast.