Silk Naturals

I have been using the SN eyeshadow primer for over a year now. However, I'm trying to get away from using un-natural products (the thought of cancer scares the daylights out of me, to be honest!). I was curious as to Karen's thoughts about the petrolatum and propylene carbonate in the primer. I looked them up on the Skin Deep cosmetics database, but I know Karen does her research and think I trust her research more than SD. This is in no way an accusation or me trying to be a trouble-maker--I promise!! I am just getting worried about what I'm putting on my face and want to be careful but not paranoid.