Doctor Rogers Day Preventative TreatmentDay Preventive Treatment helps slow signs of aging by preventing damage, boosting collagen, and brightening skin tone. Formulated with Tetrahexyldecyl Ascorbate (THD) an effective and well tolerated form of Vitamin C and two other powerful antioxidants that work together to protect your skin before, during, and after exposure to UV radiation, pollution, blue light, and other sources of skin aging free radicals. Every ingredient is nontoxic, vegan, and