This ultimate anti-aging serum is to be used in the evening for cell repair and health. As cells go under oxidative stress and lipid peroxidation, Vitamins A (retinaldehyde) & B3 (niacinamide) condition the cell membrane encouraging cellular respiration. This allows nutrition to flow into the cell and helps cellular waste escape. The mitochondria (cell energy source) is treated for DNA repair, in essence treating for lipofuscin and solar lentigines. SymWhite contains potent levels of tyrosinase inhibitors to work on even skin tone. Bisabolol soothes skin sensitivities so this serum will not irritate the skin.