What Does 25 mcg Mean on Vitamin D3?
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4 min read
According to the NIH, 1 mcg of vitamin D is equivalent to 40 IU. This means that when you see '25 mcg' on a vitamin D3 supplement label, it translates to 1000 IU, a common daily dosage for many adults. Understanding this conversion is key for proper dosing and comparing products, especially as supplement manufacturers shift towards using standardized metric units like micrograms.