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What Could Possibly Be Bad About Grapefruit?

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But Joel Edman, DSc, makes another point. "The studies on vitamin C excretion were done on healthy people, so they may not tell us about the possible benefits of higher doses when someone's ill." Edman is a clinical nutritionist at the Center for Integrative Medicine at Thomas Jefferson University Hospital in Philadelphia.

"In my opinion, an optimal amount [of vitamin C] is between 300 and 1,500 mg per day," he says. "For many people, the lower amount is probably enough, but I want to leave the door open so people who need higher levels due to a current illness, or a family history of illness, will not feel hesitant about taking it."

Everyone should try to follow an optimal diet plus supplements to fit their particular circumstances, Edman says. "Too many people are taking supplements without even knowing why they're taking them." He adds that a diet rich in natural sources of vitamins C and E is an essential foundation for health.

The bottom line? "You can't compensate for a poor diet by taking supplements."

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