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From The October 2001 Issue of Nutrition Science News
Rethinking Vitamin D
by Bill Sardi
Because vitamin D accumulates in the liver and can cause toxicity, consumers are advised to avoid consumption of more than 1,000 IU daily. But recent studies challenge this orthodoxy. The provision of 4,000 IU vitamin D3 was recently shown to be safe and did not increase blood serum calcium levels.1 A study found no adverse effects from 10,000 IU of daily vitamin D intake and no risk of calcification until 40,000 IU/day were consumed.2
Bill Sardi is a health journalist writing from Diamond Bar, Calif. He is the author of The Iron Time Bomb (Bill Sardi, 1999).
References
1. Vieth R. Vitamin D supplementation, 25-hydroxyvitamin D concentrations, and safety. Am J Clin Nutr 1999;69:842-56.
2. Vieth R, et al. Efficacy and safety of vitamin D(3) intake exceeding the lowest observed adverse effect level. Am J Clin Nutr 2001;73:288-94.
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