Medik8 C-Tetra® Luxe

The original C-Tetra contains 7% stabilised vitamin C and is ideal for those new to vitamin C or with sensitive or oily skin. C-Tetra Luxe contains 14% stabilised vitamin C — double the concentration — and is fortified with squalane, maracuja oil and red ginseng for enhanced brightening, nourishing and anti-ageing results. C-Tetra Luxe is recommended for those wanting supercharged results and a richer, more luxurious texture.

C-Tetra Luxe is clinically proven to reduce the appearance of hyperpigmentation in just 4 weeks, with 81% of users agreeing their dark spots had visibly reduced. The addition of fermented red ginseng amplifies the brightening action of vitamin C, making it a powerful choice for targeting uneven skin tone and stubborn dark spots.

Yes, absolutely. Medik8 recommends using vitamin C in the morning and vitamin A (such as Crystal Retinal) at night as part of their CSA Philosophy. This proven pairing delivers comprehensive anti-ageing benefits — vitamin C provides daytime antioxidant protection while vitamin A stimulates skin renewal overnight.

C-Tetra Luxe is formulated with tetrahexyldecyl ascorbate, a stabilised and gentle form of vitamin C that is proven to be non-irritating even at high concentrations. Unlike pure ascorbic acid, it won't cause stinging or redness. The nourishing squalane base further supports and comforts the skin barrier. If you're new to vitamin C, Medik8 recommends performing a patch test 24 hours before first use.

Using the recommended 6 drops per application each morning, a 30ml bottle typically lasts around 2 to 3 months. Because tetrahexyldecyl ascorbate is an exceptionally stable form of vitamin C, the formula remains potent from the first drop to the last — unlike water-soluble vitamin C serums that can oxidise and lose effectiveness.

C-Tetra Luxe is an excellent daily vitamin C for dry and dehydrated skin types. The squalane-rich base deeply nourishes the complexion while strengthening the skin barrier, and the blend of maracuja, jojoba, sunflower and sweet almond oils provides lasting comfort and hydration. It delivers powerful brightening and anti-ageing results without stripping or drying the skin.

Traditional vitamin C (ascorbic acid) is notoriously unstable and can break down when exposed to light, heat or air, losing its effectiveness. C-Tetra Luxe uses tetrahexyldecyl ascorbate — a stabilised, oil-soluble form of vitamin C that maintains its potency throughout the entire lifespan of the product. This means you get consistent, reliable results every time you apply it.

Yes. C-Tetra Luxe is clinically proven to reduce the appearance of wrinkles in just 4 weeks. The 14% stabilised vitamin C supports collagen production for visibly firmer, smoother skin, while the antioxidant-rich formula protects against the environmental stressors that accelerate the visible signs of ageing.

As a cosmetics company, Medik8 are unable to provide product advice in relation to medical conditions such as pregnancy. They recommend discussing the ingredients with your GP or midwife before use. As general guidance, this product does not contain any ingredients which Medik8 would recommend avoiding during pregnancy, unless advised by your doctor.