Due to its high concentration of glycolic acid, it is only recommended for skin accustomed to glycolic. If this is not your case, choose ACGLICOLIC Classic Ampoules in the first stage and, as our skin gets used to glycolic acid, you can switch to ACGLICOLIC 20 ampoules to maximize results and look renewed and hydrated skin. Use them 1 time a week, or every other day. It will also come in great if you follow anti-acne treatment or depigmenting treatment, thanks to its hydrating peeling effect.