Olive Leaf for Immunity?

I have read several articles on the use of olive leaf extract to boost immunity & control internal worms (both cats & dogs). There is a pet grade/dosage available at a local pet supply store & also online. I am curious if anyone has any knowledge or experience using it with their kitties?

Just bumping this up since you've not had any responses.  I, myself, an not familiar with it.

Thank you!