How many milligrams of vitamin D is 400 IU?
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3 min read
According to the National Institutes of Health, the FDA now requires metric units on many supplement labels, making conversions more important. This shift often raises the question: exactly how many milligrams of vitamin D is 400 IU? The answer requires a quick, two-step calculation, converting International Units (IU) first to micrograms (mcg) and then to milligrams (mg).
