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Endogenous production with full body exposure to sunlight is comparable to taking an oral dose between 250 μg and 625 μg (10,000 IU and 25,000 IU) per day. [7] [8] Vitamin D oral supplementation and skin synthesis have a different effect on the transport form of vitamin D, plasma calcifediol concentrations.
“Vitamin supplements can have potentially very serious risks and side effects when taken in excess,” Stevens wrote. ... “If you’re taking too much over time, you can get higher levels than ...
Most over-the-counter vitamin D supplements are between 1,000 and 5,000 IU, and some are as high as 10,000 IU, says Adamian. "There's so many different supplements, so it's very important to ...
There’s no risk of consuming too much vitamin E from food — adults shouldn’t take more than 1,000 mg per day — but high intake of alpha-tocopherol, a form of vitamin E in supplements, can ...
[9] [10] Vitamin-D supplements may not be effective in people with severe kidney disease. [11] [10] Excessive doses in humans can result in vomiting, constipation, muscle weakness, and confusion. [5] Other risks include kidney stones. [11] Doses greater than 40 000 IU (1000 μg) per day are generally required before high blood calcium occurs. [12]
Hypervitaminosis is a condition of abnormally high storage levels of vitamins, which can lead to various symptoms as over excitement, irritability, or even toxicity. Specific medical names of the different conditions are derived from the given vitamin involved: an excess of vitamin A, for example, is called hypervitaminosis A.