According to Recommended Dietary Allowance (RDA) (http://www.nal.usda.gov/fnic/etext/000105.html) recommended daily intake of Vitamin A is 5000 IU for man, 4000 IO for woman.
5000 IU is approximately 3 mg of beta carotene. 4000 IU is 2.4 mg beta carotene.
Daily upper limit of retinol is 3000 mg (3g or 10000 IU).
Upper limit doesn't refer to carotene forms (from dietary source). Carotene forms (foods of plant) are not toxic.
Daily intake above 20000-25000 IU is toxic for adults.
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