Trufect C19 Addict Serum. How is it different Point 1. Stabilized prescription without crowning reaction. Trufect C19 Addict Serum is designed stably with a high potency of 19%L-Ascorbic Acid excluding water, so without any browning reaction, it helps you use the activated high potency of vitamin C serum with confidence. Point 2. 24 hour delivery system. Our skin is a secretory organ that barely allows most active ingredients of serum be absorbed. But C19 Addict Serum overcomes this difficulty and created warmth through its unique technology called Ceuticalogy Delivery System, which helps the skin surface become more flexible and absorb the ingredients. Point 3. Clinically proven pure vitamin C Serum. C19 Addict Serum is a dual functionality serum of whitening and anti-wrinkle effects and also clinically proven for dark spot improvement.