Tag: International units explained

The conversion from micrograms (mcg) to International Units (IU) is not a single, universal number, but depends entirely on the specific vitamin or substance in question. For instance, 1 mcg of vitamin D is equivalent to 40 IU, while 1 mcg of vitamin A (retinol) is significantly less. This difference exists because IU measures a substance's biological activity, whereas mcg measures its mass.

For vitamin D, 25 micrograms (mcg) is equivalent to 1,000 International Units (IU), a common dosage found in supplements. However, this conversion factor is not universal and varies depending on the specific vitamin. This guide will demystify how many IU's is 25 micrograms by explaining the conversion process and providing specific examples.