Q&A quickie: What can I substitute for BHT in an anhydrous facial oil?

In the June Q&A, Amy asked, I’ve got a question for ya! I’m duping Elf’s nourishing facial oil, it’s a fairly straight forward dupe. My question is about the BHT, is it really necessary? I’m thinking that they added to extend the life of the oils, but would something like rosemary oleoresin be a more…