- Philosophy's lightweight, oil-free antioxidant and peptide serum helps reduce the first signs of aging and protect skin against the future signs of aging. Contains a powerful network of antioxidants that synergistically works together to protect the skin against future signs of aging. Helps improve the appearance of fine lines and rough texture, brighten and hydrate the skin. Apply morning and evening after cleansing and before moisturizer. Place 3-4 drops in palm of the hands, and apply to face and neck. Avoid the eye area.