I think this product was reformulated a while ago because it does not stain me. To me, it is an HOLY GRAIL. It is the less irritative vitamin C I have tried in my life. Does not have hyaluronic acid in it (big plus for me as I am intolerent). Totally transparent. Really good antioxidant effect. I always ise my vitamin C after I exfoliate my skin because blackhead are the result of oxidation. When I apply this products after exfoliating, my pores seems flawless. No blackheads at all. No other vitamin C I tried is that effective. I wouls say it seems at least 2-3 times more effective than normal vitamin C. A very competitive product to the skinceuticals at a better price.
