Medik8 C-Tetra Vitamin C Face Serum 1.0 fl oz — Stabilized Vitamin C, Hyaluronic Acid for Hydrated, Smoother Skin

Medik8 C-Tetra is a lightweight, stabilized vitamin C face serum with multi-weight hyaluronic acid that supports hydrated, smoother-looking skin when used daily.

This daily morning serum pairs a stable form of vitamin C with multi-weight hyaluronic acid, squalane and antioxidant-rich extracts to target surface texture and boost skin hydration. Designed within Medik8's CSA philosophy, it fits into a daytime routine to help protect and brighten skin while maintaining comfort for sensitive types. The formula is vegan and crafted for everyday use under sunscreen.

How will this serum affect my skin texture and brightness?

The stabilized vitamin C in C-Tetra works to support a more even, radiant-looking complexion while antioxidant ingredients help defend against environmental stressors. Regular morning use encourages a fresher surface appearance without the heaviness of oil-based serums.

• Contains a potent, stabilized form of vitamin C for long-lasting antioxidant support.
• Antioxidant botanical extracts help maintain skin clarity and tone.
• Lightweight base avoids greasy residue, so skin looks smoother, not slick.

Will this hydrate my skin without feeling heavy?

Yes — multi-weight hyaluronic acid attracts and holds moisture at different levels of the skin, while squalane adds lightweight emollience. The result is immediate softness and sustained hydration without a sticky finish.

• Multi-weight hyaluronic acid targets surface and deeper hydration.
• Squalane delivers non-greasy moisturization and skin comfort.
• Formulation sinks in quickly, suitable under makeup and sunscreen.

Is this serum suitable for sensitive skin and daily morning use?

Formulated to be gentle, the serum is appropriate for many sensitive skin types when introduced gradually. It’s intended for daytime application and works within Medik8’s recommended CSA routine—vitamin C plus sunscreen by day.

• Vegan formulation with thoughtfully selected actives to reduce irritation risk.
• Recommended for daily AM use before sunscreen for antioxidant protection.
• Start with alternate days if you have very reactive skin, then increase frequency.

How do I add this serum into my skincare routine?

Apply a few drops to clean, dry skin in the morning before moisturizer and sunscreen. It layers well beneath other lightweight products and can be paired with Medik8’s evening vitamin A step for a complete CSA approach.

• Use 2–3 drops on face, neck and décolletage after cleansing.
• Follow with moisturizer and broad-spectrum sunscreen every morning.
• Combine with Medik8 vitamin A products at night for a complementary regimen.

Who this is for: Medik8 C-Tetra Advanced Vitamin C Serum is aimed at people seeking a science-led, everyday antioxidant treatment that brightens and hydrates without heavy oils. It suits those who follow a daytime antioxidant plus sunscreen routine, anyone looking to improve surface texture and hydration, and users who prefer vegan, fragrance-free formulations that layer cleanly under makeup.

Ingredients

Water, Tetrahexyldecyl Ascorbate, Isododecane, Propanediol, Acetyl Glucosamine, Squalane, Tocopherol, Acetyl Zingerone, Camellia Sinensis (Green Tea) Leaf Vesicles, Hydroxyacetophenone, Sodium Hyaluronate, Cellulose, Avena Sativa (Oat) Kernel Extract, Glycerin, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Citrus Grandis (Grapefruit) Peel Oil, Sucrose Stearate, Tetrasodium Glutamate Diacetate, Ethylhexylglycerin, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Xanthan Gum, Sodium Benzoate, Cellulose Gum, 1,2-Hexanediol, Polysorbate 60, Sorbitan Isostearate, Citric Acid, Phenoxyethanol, Citral, Linalool, Limonene