MEASUREMENTS used in this guide:
• Gram is a metric unit abbreviated (g). It contains 1,000 milligrams.
• Milligram is a metric unit abbreviated (mg). It is 1,000th of a gram and contains 1,000 micrograms.
• Microgram is a metric unit abbreviated (mcg or µg). It is 1,000,000th of a gram and 1,000th of a milligram.
• International unit is abbreviated IU. IUs are not amounts but activity of the nutrient in the body.