Mega Dose Vitamin C Increases the Risk of CataractDecember 21, 2009 Mega Dose vitamin C has been suggested by some experts as a useful antioxidant that can prevent this common eye problem (clouding of the lens of the eye). This suggestion came from previous studies showing that low levels of vitamin C increased the risk of getting this eye problem. Unfortunately, a newly completed large study that included 24,593 women followed over a period of 8.2 years showed that it's bad for you to overdose on vitamin C. The researchers compared the number of cataract cases in women who took 1,000 mg of supplemental vitamin C versus just 60 mg of vitamin C found in many multi-vitamins. In the group taking 1,000 mg of vitamin C, their risk of getting this vision problem was 38% higher. Bad news indeed. The study further revealed that combining hormone replacement therapy (HRT) or using corticosteroid medications further increased the risk.
Avoid taking mega dose of vitamin C on a daily basis. It's probably all right to take more vitamin C when you get a cold or flu but taking this dose on a daily basis seem to create a risk for developing this eye problem. More is not always better. 
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