December 17, 2009 --Women who take high-dose vitamin C supplements may be increasing their risk of age-related cataracts. Doctors studied nearly 240,000 women for more than eight years. Those who took 1,000 milligrams of vitamin C on a regular basis or occasionally were about 25 percent more likely to have age-related cataracts removed.
Women who took extra vitamin C for 10 years or longer had even greater risk.
Researchers say the cataract risk is only present with supplements.
This study is published in the American Journal of Clinical Nutrition.