When (and how) to use Vitamin C Suspension 30% in Silicone by The Ordinary

Apply a small amount to face in the AM or the PM (PM preferred). Avoid contact with the eyes. A tingling sensation can be expected after application. If this sensation is too strong, this formula can be diluted on each application with your favourite serum or cream. If irritation occurs, cease use and consult a physician. Use only as directed on unbroken skin. Patch testing prior to use is advised.