Micrograms (mcg) and International Units (IU) are units of measurement used to quantify the amount of a substance, such as vitamins. The conversion factor varies depending on the substance. For Vitamin D, 1 mcg is equivalent to 40 IU[^1^].
The formula to convert micrograms to International Units for Vitamin D is:
\[ \text{International Units (IU)} = \text{Micrograms (mcg)} \times 40 \]
Consider a dose of 25 micrograms (mcg) of Vitamin D:
Using the formula:
\[ \text{International Units (IU)} = 25 \times 40 = 1000 \text{ IU} \]
This means the dose is equivalent to 1000 IU.
