Medik8 C-Tetra Vitamin C Face Serum 1.0 fl oz — Stabilized Vitamin C with Squalane, Lightweight Daily Antioxidant

Medik8 C-Tetra is a lightweight daily vitamin C face serum with squalane that delivers stabilized antioxidant support and gentle hydration for smoother-looking skin.

This daily serum combines a stabilized vitamin C derivative with vitamin E and plant-derived squalane to provide antioxidant protection, support skin texture, and add lightweight moisture without a greasy finish. Formulated to absorb quickly, it layers comfortably under moisturizers and SPF and suits a range of skin types looking for a simple, science-led addition to their morning routine.

How does this serum fit into a morning skincare routine?

Apply C-Tetra after cleansing and any water-based treatments, before your moisturizer and sunscreen. Its fast-absorbing formula means it won’t pill and works well as the antioxidant step to help protect skin from daily environmental stressors.

• Apply 3–5 drops to clean, dry skin in the morning.
• Allow 30–60 seconds to absorb before moisturizer and SPF.
• Pairs easily with hydrating toners and lightweight creams.
• Suitable under makeup because it leaves no heavy residue.

What key ingredients are in Medik8 C-Tetra and what do they do?

The formula centers on a stabilized form of vitamin C blended with vitamin E and squalane. Together these ingredients offer antioxidant support, help smooth the look of fine lines and texture, and replenish lost moisture for a balanced feel.

• Stabilized vitamin C: delivers antioxidant benefits with improved shelf stability.
• Vitamin E: complements vitamin C for broader antioxidant action.
• Squalane: lightweight emollient that helps restore softness and hydration.
• Fast-absorbing base: made for layering in multi-step routines.

Is this serum appropriate for sensitive or oily skin?

C-Tetra’s lightweight, fast-absorbing texture makes it accessible to many skin types, including oily or combination skin that dislikes heavy oils. Those with very sensitive or reactive skin should patch test first and introduce it gradually to monitor tolerance.

• Light texture reduces pore-clogging risk for oilier skin.
• Squalane provides hydration without heaviness or greasiness.
• Patch testing recommended for very reactive skin types.
• Can be used daily as skin adapts to vitamin C.

How will I know if the serum is working?

Look for a smoother skin surface, more even texture, and a hydrated, comfortable feel over several weeks of consistent morning use. Unlike immediate effects from moisturizers, antioxidant and texture benefits build with regular application and sun-protective habits.

• Short term: skin feels softer and less tight after application.
• Medium term: texture and the appearance of fine lines may look improved.
• Best results: paired with daily SPF and a consistent routine.
• Monitor progress over 4–8 weeks for visible changes.

Who is this for? Medik8 C-Tetra Vitamin C Face Serum with Squalane suits anyone seeking a science-backed, lightweight antioxidant serum for daily use—particularly those who want the benefits of vitamin C without heavy oils. It’s ideal for morning application under sunscreen for people with normal, combination, or slightly dehydrated skin who want improved texture and gentle hydration from a vegan, fast-absorbing formula.

Ingredients

Simmondsia Chinensis (Jojoba) Seed Oil, Cyclopentasiloxane, Cyclohexasiloxane, Tetrahexyldecyl Ascorbate, Citrus Grandis (Grapefruit) Peel Oil, Tocopheryl Acetate, PPG-12/SMDI Copolymer, Limonene, Citral, Linalool, Geraniol.