Question: how many iu in 1 mcg of vitamin d?
Answer: Today, many countries still use the IU to measure vitamin D; 1 IU of vitamin D is equivalent to 0.025 micrograms (abbreviated as either mcg or μg) of cholecalciferol or ergocalciferol. Conversely, 1 microgram of vitamin D equals 40 IU of vitamin D.