Refillable CASE Use this to buy refills online. “Our super-strength vitamin C serum is for highly experienced skincare users only.* Important: Always patch test this serum before use, for more information see FAQs below Awaken tired skin with a glow-giving shot of our super strength 30% vitamin C serum (for highly experienced skincare users only). Our potent antioxidant has been clinically proven to not only dial up brightness but boost skin radiance. It also has the power to even skin tone and shield your complexion from environmental stressors. With a high concentration of vitamin C and a luxurious balmy texture, this is the ultimate complexion boost.”