Refresh your skincare routine with TIRTIR Pure Vitamin C24 Serum 30ml — a high-potency serum designed to help improve the look of dullness, uneven skin tone, and fine lines while leaving skin looking brighter and firmer. TIRTIR’s official product page uses the exact name Pure Vitamin C24 Serum and describes it as being infused with 24% pure Vitamin C, triple collagen, and a soothing CICA-7 Complex.