If you're looking for a vitamin C serum, get this one. The formula and packaging rival the best on the market, and it's the most affordable of them. However, it hasn't done anything for me. I'm 32 with good skin, and i use a Retinoid cream, alternate between Paula's Choice (PC) AHA and BHA serums, and apply a drugstore moisturizer with SPF during the day and a PC one with antioxidants at night. I added this PC product to my skincare regime to see what it would do, and after three months, I don't see a difference.