Question: how many times a day should you use glycolic acid?
Answer: “If you're happy using glycolic acid, try a 10% formula for daily use, or a 30% once or twice a week. For those favouring lactic acid, try a 10% formula every other day. “If you still have oily skin, up your salicylic based cleanser to twice a day, followed by the use of a 10% glycolic acid toner every other day.