Medik8 C-Tetra Vitamin C Serum
Evidence-led ingredient analysis, a transparent clean score out of 100 and cleaner, effective alternatives at three price levels.
Medik8
C-Tetra Vitamin C Serum
Skincare · Budget: £45.00
4.7 (2,200 reviews)· across Medik8 UK, LookFantastic, Space NK, Cult Beauty, Boots
Ingredients: AI-inferred — not yet verified
Medik8 C-Tetra is a well-formulated, lipid-based Vitamin C serum utilizing stable Tetrahexyldecyl Ascorbate in a base of Jojoba Seed Oil and Vitamin E. Note: This analysis is based on the inferred standard published ingredient list. The formulation is highly clean and effective, though the inclusion of citrus essential oil and natural fragrance allergens may require caution for reactive or hyper-sensitive skin types.
Hazard categories
Estimated score out of 100
Formulation score is fixed across Selenssa · Community effectiveness awaiting more reports
Based on publicly available ingredients, following our methodology. Not medical advice — always check the physical label, especially for allergies. How we score →
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Medik8 C-Tetra is a high-performing, clean daily Vitamin C serum suitable for most skin types looking for gentle brightening and nourishment. Unless you have a specific sensitivity to citrus essential oils, it represents a well-formulated cosmetic choice.
Be cautious if
Individuals with diagnosed essential oil allergies or severely inflamed reactive eczema.
Against your clean standard
Yes — comfortably exceeds general clean beauty criteria, featuring safe lipid carriers and stable antioxidants without high-risk synthetics.
Where this score comes from
- Source
- No source record on file yet
- Source page
- —
- Retrieved
- —
- Evidence snapshot
- Not captured
Score history
No score changes have been recorded for this product yet.
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Does Medik8 C-Tetra Vitamin C Serum contain parabens, sulfates or fragrance?
A straight yes or no for the ingredient groups people most often want to avoid, checked against this product's published formulation.
Free from parabens
Preservatives; the longer-chain ones (propyl, butyl) carry the endocrine questions.
Free from sulfates (sls / sles)
Strong cleansing agents that can strip a compromised barrier.
Free from silicones
Slip and occlusion; cyclic silicones (D4/D5/D6) are the environmentally restricted ones.
Free from fragrance / parfum
Undisclosed fragrance blends are the most common trigger for sensitised skin.
Contains essential oils
Found: citrus grandis (grapefruit) peel oil, limonene, linalool, citral. Naturally derived, but among the most frequently reported contact allergens.
Free from drying alcohol
Fine in small amounts for texture; high up the list it can dehydrate.
Free from formaldehyde releasers
Preservatives that slowly release formaldehyde.
Free from chemical uv filters of concern
Restricted or debated filters with endocrine or reef-persistence questions.
Is Medik8 C-Tetra Vitamin C Serum non-comedogenic?
No ingredients in this formulation appear on Selenssa's common pore-clogger list, so it is unlikely to be the cause of congestion for most people. Comedogenicity is still individual — texture, occlusion and how much you use all play a part.
Is Medik8 C-Tetra Vitamin C Serum safe for sensitive skin?
Usually tolerated, but patch test if your skin reacts easily.
- No fragrance or parfum in the list
- Contains essential oils or common fragrance allergens
Ingredients worth knowing about: Citrus Grandis (Grapefruit) Peel Oil.
Medik8 C-Tetra Vitamin C Serum full ingredients list
7 ingredients analysed, in the order Selenssa assessed them. Concentration generally falls as you move down the list.
Simmondsia Chinensis (Jojoba) Seed Oil, Tetrahexyldecyl Ascorbate, Tocopheryl Acetate, Citrus Grandis (Grapefruit) Peel Oil, Limonene, Linalool, Citral.
The actives doing the work: Tetrahexyldecyl Ascorbate (Provides potent antioxidant defense and promotes collagen synthesis without the stinging acidity of L-Ascorbic acid.); Simmondsia Chinensis (Jojoba) Seed Oil (Supplies essential fatty acids to reinforce the skin lipid barrier and lock in moisture.); Tocopheryl Acetate (Works synergistically with Vitamin C to neutralize free radicals generated by UV exposure.).
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