I purchased this after reading many reviews and seeing many suggestions for using this Vitamin C serum. As this is the first one I have used I don't have another one to compare it to but after a few uses I can see that it is helping to even out my skin tone and to fade some red spots on my face. I used this a few times a week in the evenings before using a BHA and then an AHA. Due to concerns about oxidation, I store this in the refrigerator in a ziplock plastic bag to ensure it lasts longer. The price is also great as compared to other Vitamin C serums I was looking at, will definitely repurchase.