An increasing number of specialists are confident that vitamin D side effects will not occur with intake less than 10,000 IU daily-except for people who are hypersensitive because of certain medical conditions.
There is significant debate over optimal vitamin D dosage. But many experts now believe that there are no vitamin D side effects with intakes of less than 10,000 daily. This is quite a change from previous warnings that intake over 2,000 IU may be toxic. Here is what authorities are now saying about the safety of vitamin D supplements.
Natural Vitamin D
NATIONAL OSTEOPOROSIS FOUNDATION
The U.S. National Osteoporosis Foundation (NOF) warns that very high doses of vitamin D can cause kidney stones and other kidney problems- which may then lead to bone loss. But it acknowledges that it is difficult to get too much vitamin D unless a person is taking a prescription dose of the vitamin.
VITAMIN D COUNCIL
The Vitamin D Council argues that the skin produces approximately 10,000 IU vitamin D in response to 20-30 minutes of exposure to the sun in the summer and that there is no research showing that intake below this level is toxic. One of the foremost vitamin D experts, Doctor R. Vieth, argues that toxicity probably begins after long-term daily consumption of approximately 40,000 IU/day.
VITAMIN D HYPERSENSITIVITY
Vitamin D hypersensitivity is rare but may cause vitamin D side effects in the form of high blood calcium or hypercalcaemia. Some diseases that may cause this sensitivity include:Hyperparathyroidism Granulomatous diseases such as sarcoidosis, granulomatous TB, oat cell carcinoma of the lung, and non-Hodgkin's lymphoma Occult cancers which are of an unknown originPeople who are suffering from these diseases should seek a physician's advice before beginning a Vitamin D supplement program. Indeed, regular vitamin D blood tests are the best way for everyone to monitor their vitamin D level and supplement needs.
HOW MUCH VITAMIN D IS ENOUGH?
Humans make at least 10,000 units of vitamin D within 30 minutes of full body exposure to the sun. Research also indicates that healthy humans use about 4,000 IU of vitamin D a day.
Since vitamin D is stored in the body for about 60 days and people north of latitude 42 (Boston, Rome or Beijing) cannot get enough of the "sunshine vitamin" during the winter months...many health care providers are less concerned about vitamin D side effects than vitamin D deficiency. Recent studies have shown that over 70% of North Americans are vitamin D deficient for at least part of the year.
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