The original, bestselling C-Tetra serum. A gentle yet effective lightweight vitamin C serum for restoring the appearance of skin radiance and minimising the visible signs of ageing. KEY BENEFITS C-Tetra promotes a youthful-looking, glowing complexion. Skin feels immediately soft, supple and smooth. RESULTS Vitamin C minimises the appearance of fine lines and wrinkles over time, while helping to visibly balance and brighten the skin tone.