Rub into clean and dry skin in the evening, avoiding the area around the eyes and mouth. Depending on your preferences and skin reaction, you can use the serum daily or several times a week. During use and for a week after use, it is recommended to protect the skin with a high UV filter when exposed to the sun. Warning: Do not use on damaged skin, during pregnancy and breastfeeding. A slight burning sensation may occur immediately after application, which is a natural reaction of the skin to the action of acids. If the burning is strong, does not go away even after 2-3 minutes after application, or the skin remains reddened / irritated after application, rinse the skin with plenty of water and stop using the serum.