The Recommended Dietary Allowance (RDA) is the average daily requirement for a particular nutrient. With vitamin A the requirement is set in terms of retinol activity equivalents (RAE).
The RDA for an adult male is 900μg RAE. The RDA for an adult female is 700μg, though can go as high as 1,300μg during lactation. (2)
For beta-carotene from foods 1μg RAE = 12μg beta-carotene. So the RDA for beta-carotene is equal to the RDA for RAE times 12. We use the 900mcg RDA to set the RDA for beta-carotene, so it is 900μg x 12 = 10800μg.
Avoid beta-carotene from supplements. While eating a lot of beta-carotene in foods is considered harmless, beta-carotene in the form of supplements can increase the risk of lung cancer and cardiovascular disease. (2)Beta-carotene supplements are especially risky for:
Again, these risks only come from the form of beta-carotene found in supplements, and in high doses. Beta-carotene from foods is considered safe and healthy. Only consume beta-carotene supplements under supervision from a medical professional. (3)