Energy
Sleep, diet, exercise, and lifestyle can all influence your energy levels—so keep those factors in check. If you need an extra boost, raise energy levels naturally with these supplements

Coenzyme Q10 (Co Q10)
This compound—which is naturally produced by your body—improves the ability of your muscle cells to convert the oxygen in your...

Coenzyme Q10 (Co Q10)
This compound—which is naturally produced by your body—improves the ability of your muscle cells to convert the oxygen in your bloodstream into usable energy. A University of Iowa study of 20 people with chronic fatigue syndrome showed those who took 100 mg Co Q10 every day for 3 months eradicated 90 percent of their symptoms and doubled their energy levels.




Guarana Seed
Sure, caffeine accounts for much of the pop in this elixir from the Amazon. But another active ingredient, theophylline, makes...


Guarana Seed
Sure, caffeine accounts for much of the pop in this elixir from the Amazon. But another active ingredient, theophylline, makes it a high-octane energy booster. In a study published in the Journal of Sports Medicine and Physical Fitness, theophylline increased time-to-exhaustion rates in healthy men pedaling hard on a bike