The VDC website states to NOT take more than the RDA recommended for preformed Vitamin A (retinol). So for an adult male that is 3000iu and an adult female that is 2333iu. This information was taken from http://www.nutri-facts.org/eng/vitamins/vitamin-a-retinol/intake-recommendations/.
Also make sure you are adding ALL sources for example your multi vitamin could contain 2000iu or more.
The VDC website also states “Too much vitamin A can be harmful to a developing baby, so if you’re pregnant don’t take vitamin A supplements.” “Don’t eat large amounts of liver or foods made from liver such as pate either, as these contain large amounts of vitamin A.” See http://www.vitamindcouncil.org/about-vitamin-d/vitamin-d-and-other-vitamins-and-minerals/. They also state “You can also take vitamin A as a supplement, both in the forms beta-carotene and retinol”.” However, it’s possible to take too much retinol, and as your body can’t get rid of it easily, this can be harmful.” “Your body can get rid of excess beta-carotene, however.”