Is this 12% vitamin C serum for 16 dollars effective?
Im still on my search for affordable vitamin C serums and found the "CSI Vitamin C+12% youth serum". The only ingredients are 12% L-ascorbic acid and butylene glycol (around 16 dollars an ounce). My question is, considering theres no vitamin E, is it still effective as an antioxidant and against brown spots? Given the formula, is vitamin C going to work on its full effect? Thank you!