More Vitamin D Information

Andy, who takes daily nutritional supplements, wrote to ask about if his general fatigue could be related to an excessive amount of Vitamin D. He said he takes 800 IU a day. He was worried about a toxic dose. I wrote Andy back and said it is very un-likely that an excess of Vitamin D is causing his fatigue or lack or energy. Much more likely that he is taking considerably less Vitamin D than he needs or that he is consuming low quality, food grade supplements and therefore cannot determine what amount he is really taking. Andy also asked about the benefits of Vitamin D as he had forgotten why he added them to his daily nutritionals.

First of all, the FDA's current recommendation of 600 IU a day of Vitamin D is thought to be too low. Many researchers are now suggesting that 2,000 IU a day may be the minimum amount. I currently take 5,200 IU of Vitamin D each day. Vitamin D is necessary for normal bone mineralization and growth including teeth. Vitamin D assists in the absorption and utilization in the body of phosphorus and calcium. Vitamin K is also important too for bones as Vitamin K helps direct calcium to the bones and not the in soft tissues such as organs or muscles.

I don't know if anyone has figured out what the minimum level for a toxic dose of Vitamin D is, although the Mayo Clinic has published an article stating "taking 50,000 international units (IU) a day of vitamin D for several months has been shown to cause toxicity. The main consequence of vitamin D toxicity is a buildup of calcium in your blood (hypercalcemia), which can cause symptoms such as poor appetite, nausea and vomiting. Weakness, frequent urination and kidney problems also may occur."



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