I have no idea what flavorings Vapor4Life uses but you can just stay away from flavors that may include butter, custard, meat/fatty flavors in them.
Straight (no cream, non ice-cream) fruit and berry flavors,
tobacco flavors should be fine. Vapor4Life.com
If you are going to buy prefilled cartos you don't have a lot of choice. I don't know if any of the sellers of prefilled KR808D-1 cartos list whose flavorings they use.
If you want flavors which may contain custard or butter flavorings then get blank KR808D-1 soft-cap cartos and fill them yourself?