Maybe not (unless you want to get at that 'roid from the long way around) but some people are vegetarian because they want to avoid killing animals as much as possible. It seems that shark liver oil comes mainly from sharks already considered "vulnerable" by the IUCN[1]. I'd feel weird about rubbing the liver oil of a top tier predator on my ass now that I think about it.

[1] https://en.wikipedia.org/wiki/Shark_liver_oil