Vitamin C Benefits to Your Health (cont.)

"But," Moyad notes, "the ideal dosage may be higher than the recommended dietary allowance."

How Much Vitamin C Is Enough?

Most of the studies Moyad and his colleagues examined used 500 daily milligrams of vitamin C to achieve health results. That's much higher than the RDA of 75-90 milligrams a day for adults. So unless you can eat plenty of fruits and vegetables, you may need to take a dietary supplement of vitamin C to gain all the benefits, Moyad says. He suggests taking 500 milligrams a day, in addition to eating five servings of fruits and vegetables.

"It is just not practical for most people to consume the required servings of fruits and vegetables needed on a consistent basis, whereas taking a once-daily supplement is safe, effective, and easy to do," Moyad says. He also notes that only 10% to 20% of adults get the recommended nine servings of fruits and vegetables daily.

Moyad says there is no real downside to taking a 500-milligram supplement, except that some types may irritate the stomach. That's why he recommends taking a non-acidic, buffered form of the vitamin. "The safe upper limit for vitamin C is 2,000 milligrams a day, and there is a great track record with strong evidence that taking 500 milligrams daily is safe," he says.

Still, American Dietetic Association spokeswoman Dee Sandquist, RD, suggests doing your best to work more fruits and vegetables into your diet before taking supplements.

"Strive to eat nine servings of fruits and vegetables daily, because you will get a healthy dose of vitamin C along with an abundance of other vitamins, minerals, and phytochemicals that are good for disease prevention and overall health," she says.

While a cup of orange juice or a half-cup of red pepper would be enough to meet your RDA for Vitamin C, here are all the foods and beverages you'd need to consume to reach 500 milligrams (mg):

  • Cantaloupe, 1 cup: 59 mg Vitamin C
  • Orange juice, 1 cup: 97 mg
  • Broccoli, cooked, 1 cup: 74 mg
  • Red cabbage, 1/2 cup: 40 mg
  • Green pepper, 1/2 cup, 60 mg
  • Red pepper, 1/2 cup, 95 mg
  • Kiwi, 1 medium: 70 mg
  • Tomato juice, 1 cup: 45 mg

The Health Benefits of Vitamin C

According to recent research, vitamin C may offer health benefits in these areas:

1. Stress. "A recent meta-analysis showed vitamin C was beneficial to individuals whose immune system was weakened due to stress -- a condition which is very common in our society," says Moyad. And, he adds, "because vitamin C is one of the nutrients sensitive to stress, and [is] the first nutrient to be depleted in alcoholics, smokers, and obese individuals, it makes it an ideal marker for overall health."


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