Medik8 C Tetra Eye Serum 7ml LOOKFANTASTIC A formula for every skin type., Swipe to find your perfect Vitamin C match. , , C Tetra our lightweight oil is suitable for beginners and sensitive skin, , C Tetra Luxe a richer oil formula Medik8 C Tetra Serum 30 ml Not all Vitamin C serums are created equal Let's talk about two powerful options from Medik8: C Tetra and C Tetra Advanced. C Tetra is the perfect entry level Vitamin C serum, formulated with Medik8 C Tetra Serum 30 ml