Medik8 Vitamin C — Clinically Formulated Brightening & Antioxidant Protection
Vitamin C is one of the most extensively researched active ingredients in dermatology — a potent antioxidant that neutralises free radical damage, stimulates collagen synthesis, and visibly brightens uneven skin tone. Medik8 has developed a range of vitamin C serums that go far beyond a single formula, offering multiple stabilised forms to suit every skin type, sensitivity level, and lifestyle. Whether you need the lipid-soluble gentleness of C-Tetra, the clinical-strength punch of Pure C15, or the fuss-free stability of Daily Radiance, there is a Medik8 vitamin C engineered for your skin.
As an Independent Nurse Prescriber, I consider a well-chosen vitamin C serum non-negotiable in any results-driven morning routine. It is the foundation of Medik8's CSA Philosophy — Vitamin C plus Sunscreen in the morning, and Vitamin A (retinal) in the evening — a framework I recommend to virtually every patient at Stratum Clinic. Explore the full Medik8 range to build a complete routine around your vitamin C. The key is selecting the right form of vitamin C for your skin: the wrong choice can cause irritation or underperformance, while the right one delivers transformative radiance, firmness, and protection.
The Complete Medik8 CSA Morning Routine
Combine your Medik8 Vitamin C with SPF in the morning and Crystal Retinal in the evening for the full CSA protocol — the gold-standard framework for anti-ageing, brightening, and daily defence.
Not sure which vitamin C suits your skin type? Book a complimentary consultation and we will build your personalised CSA routine.
Book Your Free Skin AssessmentClinician's Pick — Mark Taylor, MSurg, INP, RMN
For sensitive or dry skin: I recommend C-Tetra. Its lipid-soluble tetrahexyldecyl ascorbate penetrates effectively without the sting or irritation of direct L-ascorbic acid — ideal for rosacea-prone and reactive skin types.
For maximum potency: Pure C15 delivers 15% pure L-ascorbic acid in an optimally buffered formula. This is my choice for patients targeting established pigmentation, photodamage, or significant collagen support.
For convenience and stability: Daily Radiance Vitamin C is a stabilised formulation that does not oxidise quickly, making it perfect for those who want reliable daily antioxidant protection without worrying about product freshness.
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Medik8 C-Tetra 30ml
Regular price £45.00 GBPRegular price -
Medik8 C-Tetra Advanced 30ml
Regular price £70.00 GBPRegular price -
Medik8 C-Tetra Cream 50ml
Regular price £55.00 GBPRegular price -
Medik8 C-Tetra Luxe 30ml
Regular price £60.00 GBPRegular price -
Medik8 Pure C15 2x15ml
Regular price £49.00 GBPRegular price -
Super C Ferulic 30ml
Regular price £69.00 GBPRegular price
Key Ingredients & Technologies
How to Layer Vitamin C in Your AM Routine
Step 1 — Cleanse: Start with a gentle cleanser to remove overnight residue.
Step 2 — Vitamin C Serum: Apply your chosen Medik8 vitamin C to clean, dry skin. Use 4–5 drops and press gently into the face and neck.
Step 3 — Hydrate: Follow with a lightweight moisturiser or hyaluronic acid serum.
Step 4 — SPF: Finish with a broad-spectrum SPF 30–50. This is essential — vitamin C boosts your sun protection but does not replace it.
Evening: Switch to Medik8 Crystal Retinal in the PM to complete the CSA Philosophy. Never use vitamin C and retinal in the same routine — one is for morning, the other for evening.
Vitamin C — Frequently Asked Questions
Which Medik8 vitamin C is the strongest?
Pure C15 is the most potent option, containing 15% pure L-ascorbic acid — the gold standard for maximum antioxidant activity and collagen stimulation. It is best suited to non-sensitive skin that has some experience with active ingredients. If you find L-ascorbic acid too intense, C-Tetra offers excellent results through a gentler lipid-soluble pathway. Browse all our serums to compare options.
Can I use Medik8 vitamin C with Crystal Retinal?
Yes — but not at the same time. Medik8's CSA Philosophy is designed exactly for this: apply your vitamin C serum in the morning alongside SPF, then use Crystal Retinal in the evening. This separation ensures both actives perform optimally without competing for absorption or causing unnecessary irritation.
What is the difference between C-Tetra and Pure C15?
C-Tetra uses tetrahexyldecyl ascorbate, a lipid-soluble vitamin C derivative that penetrates through the skin's lipid barrier without requiring a low pH. It is gentle, stable, and ideal for sensitive or dry skin. Pure C15 uses 15% direct L-ascorbic acid at an optimised low pH for maximum potency — it is stronger but may tingle on reactive skin. Choose C-Tetra for comfort and tolerance, Pure C15 for clinical-strength results.
Does vitamin C cause sun sensitivity?
No — vitamin C is actually photoprotective. Unlike retinoids or AHAs, vitamin C does not increase your skin's sensitivity to UV light. It works as an antioxidant shield against UV-generated free radicals, which is precisely why it is recommended as a morning active. However, you should always pair vitamin C with a broad-spectrum SPF for comprehensive protection.
How should I store my vitamin C serum?
L-ascorbic acid formulations like Pure C15 are sensitive to light, heat, and air. Store them in a cool, dark place and ensure the cap is tightly sealed after each use. If the serum turns dark orange or brown, it has oxidised and should be replaced. Medik8's C-Tetra and Daily Radiance use more stable vitamin C forms that are less prone to oxidation, but good storage practice still extends their efficacy.
Not Sure Where to Start?
Two routes, both free. Take our 90-second skin quiz for an instant expert-built routine, or book a consultation with Mark for a conversation first.