How to Use Suggested Usage: -This serum can be used morning or evening towards the beginning of your skincare routine. -Apply one or two pumps to clean, dry skin as a leave-on treatment. For sensitive skin, try as a mask: -Apply one to three pumps to clean, dry skin and leave on for 15 minutes. -Rinse well and pat dry. Sunday Riley says: -Try applying Good Genes All-In-One Lactic Acid Treatment over one of Sunday Riley’s treatment oils; try C.E.O. Glow Vitamin C + Turmeric Face Oil (sold separately) for double the brightening and rejuvenating power. -Oily or combination skin may not even need moisturizing. Good Genes deeply exfoliates the dull surface of the skin for instant glow and radiance. As dull, dead surface cells are removed, clarity and smoothness are restored. Good Genes visibly brightens the appearance of dark spots and discolorations and instantly plumps the look of fine lines and wrinkles in 3 minutes. This multi-tasking, targeted lactic acid treatment rapidly exfoliates and boosts naturally youthful radiance, while visibly reducing the look of lines, wrinkles, and dark spots. High potency, purified grade lactic acid exfoliates dull, pore-clogging dead skin cells, to instantly clarify and reveal smoother, clearer skin. Together with skin brightening licorice, this super-concentrated treatment visually reduces the look of dark spots and discoloration caused by exposure to the sun, for naturally brighter, even-toned skin.