AHA or Alpha hydroxy acid is a chemical exfoliant that can treat pigmentation and give the skin a firmer and brighter appearance. You cannot start using an AHA solution every day, but this should be completely safe once your skin gets used to them. You do need to take into account the concentration of your formula and your skin type, though. If you are using AHAs, you should be extra careful when exposing your skin to the sun as it will b more sensitive.