Medik8 C-Tetra - Lipid 7% Vitamin C Radiance Serum - Smoothing, Brightening & Nourishing - Perfect For New Vitamin C Users or Sensitive Skin - 30ml
by Medik8
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Medik8 C-Tetra uses tetrahexyldecyl ascorbate (THDA), an oil-soluble, highly stable form of Vitamin C that bypasses the pH sensitivity limitations of L-ascorbic acid and is well-tolerated by sensitive skin. Best for Vitamin C beginners or sensitive skin and Dry and dehydrated skin types.
According to the AIScored 0–100 scoring system, Medik8 C-Tetra - Lipid 7% Vitamin C Radiance Serum - Smoothing, Brightening & Nourishing - Perfect For New Vitamin C Users or Sensitive Skin - 30ml by Medik8 scores 72.0/100, ranking #11 out of 34 products in Vitamin C Serums (2026). Strongest category: Ingredient Quality (80.0/100). Weakest: Value For Money (63.0/100).
Is Medik8 C-Tetra - Lipid 7% Vitami... worth buying?
“Medik8 C-Tetra scores 72/100 and uses tetrahexyldecyl ascorbate, a genuinely stable form of vitamin C that sidesteps the pH sensitivity problems of L-ascorbic acid. It's particularly well-suited for sensitive skin or vitamin C newcomers, and it won't clash with your other actives.”
What Do Reviewers Say About Medik8 C-Tetra - Lipid 7% Vitamin C Radiance Serum - Smoothing, Brightening & Nourishing - Perfect For New Vitamin C Users or Sensitive Skin - 30ml?
Sample excerpts from currently available source material used in this product analysis.
"This is a lovely vitamin c for your face. It dries quickly and feels great on my face."
"Excellent vitamin C serum. Very well priced compared to many out there. I always seem to breakout more if for some reason I dont use it. Makes my skin glow more also."
"Great product, but I didn’t realise it’s OIL with VitC when I prefer serum. But great quality."
"This is a nice product and I have used it before with no issues. However this time I had a really unpleasant reaction leaving my face looking burnt, bumpy and very red like an acne breakout - I’m 58 and have never had acne."
"Excellent product, long time user as recommended by my dermatologist. Lightweight, absorbs super fast, lovely scent and really brightens up my skin! To use every morning after clean/tone and before moisturizer."
How does Medik8 C-Tetra - Lipid 7% Vitamin C R... score?
Detailed score breakdown and key findings from our analysis of 10 reviews across 1 source.
Pros
- +Tetrahexyldecyl ascorbate is highly stable and does not oxidise rapidly like L-ascorbic acid
- +Low irritation potential — suitable for sensitive or Vitamin C-naive skin
- +No low-pH requirement, so no compatibility conflicts with other actives
- +Jojoba base is non-comedogenic and absorbs without heavy residue
- +Dermatologist-recommended; multiple users report visible brightening and glow
Cons
- -Oil-based texture is not clearly communicated — buyers expecting an aqueous serum may be disappointed
- -THDA has weaker direct antioxidant potency versus L-ascorbic acid at equivalent percentages
- -At least one user reported a significant inflammatory reaction (redness, bumps) — could indicate individual sensitisation or ingredient interaction
- -Premium pricing relative to product volume; travel sizes have caused value complaints
Best For
Watch Out
- !Not ideal for oily or acne-prone skin — oil base may feel heavy for these types
- !Texture mismatch if expecting a traditional water serum
- !Rare but reported inflammatory flare-ups — patch test before full application
- !Less potent than high-concentration L-ascorbic acid for stubborn hyperpigmentation
What is Medik8 C-Tetra - Lipid 7% Vitamin C Radiance Serum - Smoothing, Brightening & Nourishing - Perfect For New Vitamin C Users or Sensitive Skin - 30ml?
Medik8 C-Tetra - Lipid 7% Vitamin C Radiance Serum - Smoothing, Brightening & Nourishing - Perfect For New Vitamin C Users or Sensitive Skin - 30ml is a vitamin c serums product by Medik8, scoring 72.0/100 on AIScored.
- • INCREASED SKIN YOUTHFULNESS - 7% Stabilised Vitamin C (tetrahexyldecyl ascorbate), formulated to simultaneously smooth the look of fine lines and wrinkles while visibly boosting skin glow and radiance.
- • BRIGHTER, MORE EVEN COMPLEXION - Visibly brightens the skin tone, for a more even and healthy-looking skin appearance.
- • Contains tetrahexyldecyl ascorbate - an effective, stabilised, and low-irritation form of vitamin C LIGHTWEIGHT NOURISHMENT - This jojaba seed oil-based formula delivers effective yet non-greasy nourishment for visibly softer and comforted skin.
- • HOW TO USE - Step 1: After cleansing in the morning, massage 4 drops across the face, neck and décolletage.
- • Step 2: Leave to absorb before applying sunscreen.
- • COMPLETE YOUR REGIME - For maximum age-defying results, we especially recommend using this product as part of our pioneering CSA Philosophy; vitamin C plus sunscreen by day, vitamin A by night.
How We Score Supplements
Our methodology analyses review data, ingredient science, and product information, then scores each product on a 0-100 scale across evidence-based categories:
Effectiveness
How well the product delivers its claimed benefits, based on reviews and ingredient evidence.
Ingredient Quality
Bioavailable forms, clinically effective dosages, clean label, minimal fillers.
Value for Money
Price relative to ingredient quality, dosage count, and effectiveness.
Side Effects Profile
Higher score = fewer side effects. 100 means virtually no adverse reactions reported.
Certifications & Testing
Third-party lab testing, GMP certification, and independent quality verification.
Overall Score
Weighted combination of all factors. Our bottom-line recommendation.
How Does Medik8 C-Tetra - Lipid 7% Vitamin C Radiance Serum - Smoothing, Brightening & Nourishing - Perfect For New Vitamin C Users or Sensitive Skin - 30ml Compare?
See how this product stacks up against the top-rated vitamin c serums in our database.
| Product | Score | Price |
|---|---|---|
| Medik8 C-Tetra - Lipid 7% Vitami... (this) | 72.0 | — |
| COSRX Alpha-Arbutin 2% Discolora... | 80.0 | £21.89 |
Price History (90 days)
Frequently Asked Questions
Is Medik8 C-Tetra - Lipid 7% Vitamin C Radiance Serum - Smoothing, Brightening & Nourishing - Perfect For New Vitamin C Users or Sensitive Skin - 30ml worth buying in 2026? ▼
What are the pros and cons of Medik8 C-Tetra - Lipid 7% Vitamin C Radiance Serum - Smoothing, Brightening & Nourishing - Perfect For New Vitamin C Users or Sensitive Skin - 30ml? ▼
How does Medik8 C-Tetra - Lipid 7% Vitamin C Radiance Serum - Smoothing, Brightening & Nourishing - Perfect For New Vitamin C Users or Sensitive Skin - 30ml compare to COSRX Alpha-Arbutin 2% Discoloration Serum with Tranexamic Acid 3% Anti-pigmentation Serum for Face with Niacinamide, Blemish Control, Dark Spot Corrector for Even Skin Tone Korean Skincare 50ml? ▼
Disclaimer: AIScored provides research-backed summaries based on publicly available reviews and product information. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Affiliate links may earn us a commission at no extra cost to you.
What Are Other Top Vitamin C Serums?
Other top-rated vitamin c serums you might want to compare.
COSRX Alpha-Arbutin 2% Discoloration Serum with Tranexamic Acid 3% Anti-pigmentation Serum for Face with Niacinamide, Blemish Control, Dark Spot Corrector for Even Skin Tone Korean Skincare 50ml
COSRX
CeraVe Skin Renewing 10% Pure Vitamin C Serum with Ceramides for Brighter and Smoother Skin, 30 ml
CeraVe
Bakuchiol Face Serum 50ml-Natural Retinol Alternative for Sensitive Skin, Vitamin C, Anti-Ageing & Acne, Reducing Fine Lines & Wrinkles-Hydrating & Glowing your Face. SCPN UK Registered
Dr. BIEN-AIME
Beverly Hills Vitamin C Face Serum 25% with Hyaluronic Acid & L-Ascorbic Acid
BEVERLY HILL
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