10% VITAMIN C SERUM: This serum is the perfect face care product to deliver glowing, brighter skin in 5 days when consistently used. GLOWING, BRIGHTER SKIN IN 5 DAYS: Clinically tested: 10% Vitamin C and 5% Niacinamide delivers glowing, brighter skin in 5 days. REDUCES DARK SPOTS IN 3 DAYS: A powerful combination of 10% Vitamin C and 5% Niacinamide helps reduce Dark Spots in 3 Days. EVENS SKIN TONE: A perfect beginner-friendly serum, this 10% Vitamin C serum fades discolorations to even skin tone. STABLE FORM OF VITAMIN C: The naturally occurring form of vitamin C is highly unstable so there is a skincare hero which is a derivative of Vitamin C, known as 3-O-Ethyl ascorbic acid.