skinbetter science Alto Advanced Defense and Repair Serum provides powerful antioxidant defense. This super-potent serum, containing Vitamins C, E, and 17 additional antioxidants, employs two proprietary technologies. It comprehensively shields skin from environmental stressors and free radicals, repairing signs of aging. Expect improved dullness, redness, tone, and texture for brighter, more radiant-looking skin. This 30 ml serum is dermatologically tested and free from parabens, fragrances, dyes, and animal testing.