Energy-Boosting Supplements: Myths and Facts

She adds that if you're chronically fatigued, you should visit your doctor. But studies find that many Americans are lacking iron and magnesium, two minerals found in food.

The recommended daily allowance of iron for men and women over 50 years old is 8 milligrams a day, while women from 19 to 50 should get 18 milligrams a day. Symptoms of iron deficiency include fatigue, paleness, and being frequently cold.

Iron (ferrous sulfate) food sources:

Total cereal





Whole wheat spaghetti

Beet greens

Heller says that magnesium is a powerhouse mineral used in more than 300 biochemical reactions in the body, including proper muscle, nerve and heart function, protein synthesis and energy metabolism, and again, many Americans are deficient. The recommended daily allowance is 300 milligrams to 400 milligrams a day.

"There is no doubt that you need to boost your intake of high magnesium foods to get your engine running at its peak," Heller said.

Magnesium food sources:



Black beans



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