According to the research I've done, taking high amounts of vitamin A in animal form can lead to issues (Vitamin A1, retinol). However, the Carotenoid form (ex: beta carotene) seems harmless.
I heard some people can take megadoses of vitamin A regularly, and the only real side-effect is Carotenaemia, which is harmless (and sometimes desired - for fair-skinned people, it acts as a natural tan).
Is there any excessive harm to the liver for chronic use of - say 10,000 IU of beta carotene? How about 100,000 IU of beta carotene?