This Vitamin C Serum by InstaNaturals is probably the best vitamin c serum I have ever tried. It goes on very nice and smoothly, leaving my face smooth and refreshed, After using it for two weeks, I am seeing a huge difference. My complexion is clearer than ever and my various dark spots have lightened up. It is not greasy and is easy to apply. A little bit goes a long way. After only 2 weeks, my skin is healthier than ever. I tend to get rashes on my face and this stuff is the first stuff to ever stop the rashes in their tracks! They heal up any damage to my skin, pimples included, faster than any product I have ever tried! The ingredients are all natural, as well, so they are good for your skin in general!