Beauty products that gross you out

Just read in the current Allure about the ReGenica skincare line, which features growth factors from babies' foreskins, or, as Allure put it, "cells from newborn skin (left over from circumcision)."

I'm not saying I totally object to having foreskin on my face, but I believe I should know its owner very, very well.

What other beauty products are way too gross to use??