Vitamin C serum is a hero anti-oxidant that fights free radical damage and sun exposure, preventing premature aging. Brightens skin with effective anti-oxidant formula. Tingling sensation may be experienced during the first week of use, but will fade as the skin develops tolerance. Highly effective for targeted treatments and can be used with other Super Activ Serums for separate concerns. Formulated with stable and non-oxidative 3-0-ethylated Ascorbic Acid, which is highly effective and provides maximum dose permissible under dermal limits.