21.5% of Pure Vitamin C Non-Sticky Formula Improved Absorption Paraben Free Designed with simplified & optimized formula for delivering maximum efficacy of Pure Vitamin C. By Wishtrend Pure Vitamin C 21.5% Advanced Serum is formulated with highly concentrated pure Vitamin C (21.5%) and Sea Buckthorn Water (70%), to maximize the effects of vitamin C. Suggested Use: After cleansing, use toner to prepare your skin. Then, apply 1-2 drops of Vitamin C 21.5% Serum and let it absorb. (Avoid sensitive areas such as the eye. lip, or any scarred area, and use on the face as a whole.) In daylight or outdoors, always apply sunscreen (with at least SPF 15).