As we celebrate the 235th birthday of our great nation, we asked a number of community leaders to share their thoughts on what the Fourth of July means to them. The Fourth of July reminds me very simply of our freedom.
Vitamin A: 1 IU is the biological equivalent of 0.3 mcg retinol, or of 0.6 mcg beta-carotene. 1  Vitamin D: 1 IU is the biological equivalent of 0.025 mcg cholecalciferol or ergocalciferol. 2  Vitamin E: 1 IU is the biological equivalent of 0.67 mg d-alpha-tocopherol, or 0.9 mg of dl-alpha-tocopherol.
In comparison, 1 milligram equals 1,000 times 1 microgram. Both units are used in the field of medicine to administer drug dosage. Microgram's symbol is Âµg, but the abbreviation mcg is used in medicine so as to avoid confusion with milligram's symbol (mg). Learn more about Chemical Equations