I'm using my second bottle of Coui Super C serum. The serum is a little thick right out of the bottle. After cleansing and using toner, I apply the serum onto my face, including the eye area. Leave it for a few minutes while gently patting the serum into skin. There is a slight tightening effect as the serum dries, which I like.

I've tried many Vitamin C serums, and so far I like this Super C most. I've just bought more bottles for my parents. If this works as well for them, I'll definitely be buying more and will review again at that time.