The process is known as the—wait for it—“sandwich method,” and it’s intended to
The basic idea of how to sandwich retinol or a retinoid (the technique gets its name from the layers involved in the application method) is this: apply a layer of
Gilbert isn't the only skin-care expert with advice for using retinol effectively on sensitive skin
For topical dosage forms (cream, gel, or liquid): Adults—Apply to the affected area(s) of the skin once a day, at bedtime