How to use:?Apply a sufficient amount of vitamin C serum to cover the face onto cleansed, dry skin, ideally at night. If used during the day, follow with sunscreen.? Do not use on irritated skin and discontinue if irritation occurs. Avoid contact with eyes. If contact occurs, rinse with warm water. If using in the day follow with an SPF. Store in the fridge. To prevent oxidisation, do not open the bottle.? Wash hands after use.