1 IU of retinol is equal to 0.3 mcg RAE and 1 IU beta-carotene is equal to 0.15 mcg of RAE.
This means in each drop of Vitamin A drops there is approximately 5,046 IU of vitamin A (5000 IU retinol and 46 IU of beta-carotene).
There is 1500 IU of Vitamin A in Optimal Iron Plus Cofactors (1000 IU as beta carotene and 500 IU as retinol).
All labels will on website and product bottles will be changing in 2018 to reflect new FDA regulations for vitamin A to be in units of RAE (Retinol Activity Equivalents). This will help consumers to understand bioavailability of the two forms by using the same units of measurement.