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Medik8’s cult-favourite vitamin C serum, featuring stabilised vitamin C that is gentle on sensitive skins and vitamin C-beginners, yet effective in delivering visible brightening results.Up to 6 months supply from a full size bottle (2 months' supply from a travel size).. KEY BENEFITS. A proven low- irritation formula, 96% of sensitive skins found C-Tetra to be gentle on their skin.*. RESULTS. Vitamin C minimises the appearance of fine lines and wrinkles over time, while helping to visibly balance and brighten the skin tone.. KEY INGREDIENTS. Tetrahexyldecyl Ascorbate (Vitamin C) & Vitamin E