Coenzyme Q10 (CoQ10) is a key component of the mitochondria-the energy-producing units of the cells in your body. Since your heart cells can"t function without energy, they can"t function without CoQ10. † As you age, your body"s natural production of CoQ10 declines, making CoQ10 supplementation even more important. Plus, supplementing with higher dietary levels of CoQ10 can nutritionally support cardiovascular heatlh.