Dr esthe Whitening A Serum is a highly concentrated serum that keeps the skin bright and clear. It controls skin tone, elasticity, and moisture with niacinamide, vitamin C, and vitamin complex and also helps to improve and keep skin clear of blemishes. This serum not only controls and prevents dark spots from sun damage, but also helps to treat and prevent dark spots that may pop up after clinical treatments like lasers and peels. Collagen and hyaluronic acid keep skin smooth and plump.