Vitamin D: 1 IU is the biological equivalent of 0.025 μg cholecalciferol/ergocalciferol
1000iu=25ug
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The conversion factor for International Units (IU) to milligrams (mg) varies depending on the substance being measured. For Vitamin D, the conversion factor is typically 40 IU to 1 mcg (microgram) or 1000 IU to 25 mcg. Therefore, to convert 500,000 IU of Vitamin D to milligrams, you would divide by 40 to get 12,500 mg or divide by 25 to get 20,000 mg, depending on the specific conversion factor used.
one mg is in one mg
A vitamin's expiration date has passed. It was suppose to contain 500 mg of Calcium, but it has lost 325 mg of Calcium. How many mg of Calcium is left? Is this a trick question? Calcium is not a vitamin, but an element. Calcium, being an element, can't be 'lost', since, according to the laws of conservation, matter cannot be created nor destroyed (except in nuclear reactions). Nor can calcium be converted to something else, merely reacted with to form some other calcium compound, thus is still there. Radioactive isotopes of Calcium could decay over long periods, so it also depends on how long the expiry date has passed, and what isotopes are involved. If you somehow meant to type vitamin C instead of Calcium, then the matter is simple arithmetic and doesn't need to be answered on this forum, I would think.
3500 mg
1?