Retin-All PM is a highly effective version of vitamin A specifically for night time use and encapsulated for extreme potency and freshness. When applied before sleep when the skin is in rejuvenation mode, Retin-All PM works deeply to renew, restore, and repair, allowing you to wake up to significantly more radiant and youthful skin. Thirty capsules represent a one month supply for the face and neck. May be used in conjunction with Adrien Arpel C Source daily capsules for 24 hour age defiance.