1 IU of supplemental retinol/beta-carotene is equal to 0.3 mcg RAE.
This means in each drop of Vitamin A drops there is approximately 5,023 IU of vitamin A (5000 IU retinol and 23 IU of beta-carotene).
There is 1000 IU of Vitamin A in Optimal Iron Plus Cofactors (500 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.