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The recommended dietary allowance (RDA) for vitamin A is usually expressed in microgram, but can also be expressed in International Units (IU) or milligram.
The RDA for infants is based on the amount of retinol present in mother's milk. Breastfeeding women need a higher daily dose of the vitamin to compensate for the amount of the vitamin lost via breast milk.
The current RDA/adequate intake for vitamin A is 900 microgram per day for male adults, 700 microgram per day for female adults, and 1 300 microgram for breastfeeding women.
