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While some studies have found that vitamin D 3 raises 25(OH)D blood levels faster and remains active in the body longer, [43] [44] others contend that vitamin D 2 sources are equally bioavailable and effective for raising and sustaining 25(OH)D. [45] [46] If digestive disorders compromise absorption, then intramuscular injection of up to ...
[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]
Vitamin D2 vs. D3 Uses. Both vitamin D2 and vitamin D3 will help to increase vitamin D levels in the blood, says Pelitera. However, some studies have shown that supplementing vitamin D3 does a ...
The best vitamin D supplements. Both vitamin D2 and D3 are good, but “D3 has better bioavailablilty,” says Dr. Manson, meaning that it’s more easily used by your body.
These two forms of vitamin D are metabolized in the liver and stored as 25-hydroxyvitamin D. [4] Before biological use, the storage form must be converted into an active form. One common active form is 1,25-dihydroxyvitamin D. [4] The term vitamin D in this article means cholecalciferol, ergocalciferol, 25-hydroxyvitamin D, and the active forms ...
There's lots of confusion around the difference between vitamin D2 and vitamin D3, and which is best for whom. Doctors and experts explain.
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