FACTS:
Vitamin A is fat-soluble. It requires fats as well as minerals to be properly absorbed by your digestive tract. It can be stored in your body and need not be replenished every day. It occurs in two forms—preformed vitamin A, called retinol (found only in foods of animal origin), and provitamin A, known as carotene (provided by foods of both plant and animal origin).
Vitamin A is measured in USP Units (United States Pharmacopeia), IU (International Units), and RE (Retinol Equivalents). (See section 168.) 1,000 RE (or 5,000 IU) is the recommended daily dosage for adult males to prevent deficiency. For females it’s 800 RE (4,000 IU). During pregnancy the
new RDIs/RDAs do not recommend an increase, but for nursing mothers an additional 500 RE is suggested for the first six months and an additional 400 RE for the second six months.
There is no formal RDI/RDA for beta-carotene, because it is not (yet) offi- cially recognized as an essential nutrient. But anywhere from 10,000–15,000 IUs of beta-carotene are needed to meet the RDI/RDA for vitamin A.
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