Prentice RL, Pettinger MB, Jackson RD, et al.The American Journal of Clinical Nutrition. Vitamin D and calcium supplementation reduces cancer risk: results of a randomized trial. Lappe JM, Travers-Gustafson D, Davies KM, Recker RR, Heaney RP.Optimal vitamin D status for colorectal cancer prevention: a quantitative meta analysis. Gorham ED, Garland CF, Garland FC, et al.25-hydroxyvitamin D and risk of myocardial infarction in men: a prospective study. Giovannucci E, Liu Y, Hollis BW, Rimm EB.The use of calcium and vitamin D in the management of osteoporosis. The Journal of Clinical Endocrinology & Metabolism. These research findings support the notion that vitamin D intake levels of around 5,000 IU daily are unlikely to be harmful in the short term. Although this level of vitamin D is higher than what is typically considered normal, the blood calcium concentration among the men in the study remained normal. A study report published in the January 2003 issue of "The American Journal of Clinical Nutrition" noted that intake of 5,000 to 5,500 IU of vitamin D daily for up to 20 weeks during the winter months among men living in Omaha, Nebraska, produced serum vitamin D levels just below 150 nmol/L. Serum vitamin D levels plateaued at 69 and 96 nmol/L in the low and high intake groups, respectively, without changing serum calcium levels.Īccording to a 2011 report from the Institute of Medicine, vitamin D intakes of less than 10,000 IU daily have not been linked with indicators of toxicity, such as high blood and urinary calcium levels and tissue calcification.Your blood vitamin D level is affected by your sun exposure and dietary intake.
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