I think you’re referring to our Vitamin C&E Treatment? While you are correct that vitamin C can cause blackheads but it’s only certain kinds of vitamin C. The unstable forms of vitamin C that contain pure l-ascorbic acid or ascorbic acid can do that for people with larger pores and oily, acne-prone skin. It’s not too common but it can happen. But our Vitamin C&E Treatment is completely stable and in fact, it can help them so I’m surprised to hear that you’re feeling like you’re getting more. I really don’t know why that would be. Be sure you’re exfoliating well and regularly as that is always beneficial for lessening them. Read this post that talks about getting rid of blackheads .