Medik8's popular vitamin C serum, featuring stabilized vitamin C, is gentle on sensitive skin and ideal for those new to vitamin C, yet it effectively delivers noticeable brightening results. A full-size bottle provides up to six months' supply (two months for travel size). Key Benefits:The low-irritation formula is proven, with 96% of sensitive skin users finding C-Tetra gentle on their skin. Results:Vitamin C reduces the appearance of fine lines and wrinkles over time, while visibly balancing and brightening the skin tone.