Defend against premature skin ageing and achieve accelerated visible skin brightening with Medik8's C-Tetra Advanced serum. This high-performance formula features a next-generation combination of 20% stabilised vitamin C and cutting-edge phyto exosomes, designed to shield and improve the skin's recovery from environmental stressors that cause premature ageing. Clinically proven to brighten skin and visibly improve wrinkles in just 7 days with 0% barrier disruption, C-Tetra Advanced is engineered for high-performance visible brightening, skin smoothing, and daily antioxidant defence. It combines potent, stabilised 20% vitamin C with restorative phyto exosomes and the omni-antioxidant acetyl zingerone to neutralise the ageing effects of free radicals. The result is a high-performance, age-defying vitamin C serum that works smarter, not harsher. Key benefits include dramatic skin brightening, enhanced skin barrier support, defence against premature ageing, and a smoother, more even texture. The lightweight, fast-absorbing gel-serum texture hydrates, smooths, and primes the skin, leaving it instantly refreshed and ready for the day. Featuring Multi-Weight Hyaluronic Acid to plump and deeply hydrate, and N-Acetyl Glucosamine to refine pores and support the skin barrier.