Most of the stuff you see on the internet about fountain-of-youth supplements is bunk, but I trust the Nutrition Action Newsletter.  They highlighted two supplements that affect mitochondria, the structures at Ground Zero of your cells.  They like the quercetin in Lance Armstrong’s FRS energy drinks, chews, and mixes, available at GNC, GNC’s at Rite Aids, and Vitamin Shoppes.  Quercetin boosts muscles, brains, and immunity in mice and is being tested in humans.  Old rats given carnitine and lipoic acid in a 2002 study “got up and did the Macarena.”  The rest of us old rats can get that combination in Dr. Weil’s Juvenon, reported to boost energy, memory, and learning and available online.  GNC has a version called Alcar & ALA that’s less expensive.  Of course, a proven way to make mito’s mightier is regular aerobic and strength training.