How to Use and Warnings: After cleansing the skin, first toner and then a few drops of serum should be applied to your towel-dry skin using cotton. Serum is suitable for use in the morning and evening. If you have not used a product containing glycolic acid before, we recommend that you use the Tonic only in the evenings until your skin gets used to it. Dermatologically tested - suitable for all skin types. Before using it, apply it to a small area of your skin to prevent possible side effects and irritation - if no sensitivity occurs, you can continue using it. If sensitivity occurs, discontinue use. If it will be included in your morning care routine, we recommend that you apply sunscreen afterwards. For external use - keep in its original packaging away from direct sunlight.