Image: medik8.com
Medik8
C-Tetra® Advanced
A serum built around Vitamin C derivative and Vitamin C, for barrier repair and hydration.
Brand price
GBP 72.00 · checked 8 Oct 2026 · on the brand's site
From the brand
What the brand says about this product. Our ingredient analysis follows below.
The brand recommends it for
- Dry skin
- Oily skin
- Combination skin
- Normal skin
- Sensitive skin
- Redness & rosacea
- Fine lines & wrinkles
- Dullness
- Uneven texture
How to use
Apply as part of your morning skincare routine. Massage 2-3 pumps across the face, neck and décolletage. Follow with moisturiser and always finish with sunscreen.
Caution
If you're new to C-Tetra Eye, we recommend a patch test at least 24 hours before first use. Learn how to patch test here .
What's inside
Ingredients List
11 trigger at least one check · 20 trigger none
- Fatty alcohols (Malassezia)
- Vitamin C
- Vitamin C derivative (stable)
- Antioxidant
- Brightening
- Dark Spots
- May Worsen Seborrheic Dermatitis
- Fatty alcohols (Malassezia)
- Dark Spots
- Hydrating
- May Worsen Seborrheic Dermatitis
- Vitamin E
- Anti-Pollution
- Antioxidant
- May Trigger Acne
- May Worsen Irritation
- May Worsen Keratosis Pilaris
Key Ingredients
Hyaluronic acid1
Hyaluronic acid and its salts; a humectant that binds water to the skin.
Benefits
Hydrating6
Boosts hydration and relieves dry, tight skin.
Acetyl Glucosamine, Glycerin, Propanediol, Sodium Hyaluronate, Squalane, Tocopherol
Barrier Repair7
Strengthens and restores the skin's natural barrier.
Acetyl Zingerone, Avena Sativa Kernel Extract, Glycerin, Isododecane, Squalane, Sucrose Stearate, Tocopherol
Smoothing5
Refines rough or uneven texture.
Avena Sativa Kernel Extract, Citric Acid, Isododecane, Squalane, Sucrose Stearate
Antioxidant5
Shields skin from free radical damage.
Acetyl Zingerone, Avena Sativa Kernel Extract, Hydroxyacetophenone, Tetrahexyldecyl Ascorbate, Tocopherol
Anti-Pollution6
Helps defend against airborne pollutants.
Acetyl Zingerone, Avena Sativa Kernel Extract, Glycerin, Hydroxyacetophenone, Tetrahexyldecyl Ascorbate, Tocopherol
Concerns
May Worsen Seborrheic Dermatitis6
May feed the yeast involved in seborrheic dermatitis.
Acetyl Glucosamine, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Polysorbate 60, Sorbitan Isostearate, Sucrose Stearate, Tetrahexyldecyl Ascorbate
May Worsen Keratosis Pilaris2
May clog follicles or strip skin prone to keratosis pilaris.
May Worsen Irritation5
May cause stinging, redness or sensitivity.
Citral, Citrus Grandis Peel Oil, Limonene, Linalool, Tocopherol
May Worsen Eczema4
May worsen itching or irritation for eczema-prone skin.
May Worsen Rosacea4
Can trigger flare-ups in rosacea-prone skin.
Ingredients Explained
Click on any ingredient to learn more about it
Aqua
Solvent
Tetrahexyldecyl Ascorbate
Antioxidant, Skin Conditioning
Tetrahexyldecyl Ascorbate isn't fungal acne safe.
Learn more about Tetrahexyldecyl Ascorbate →Isododecane
Perfuming, Emollient, Solvent
2,2,4,6,6-Pentamethylheptane; Hydrocarbons, C4, 1,3-butadiene-free, polymd., triisobutylene fraction, hydrogenated
Learn more about Isododecane →Propanediol
Solvent, Viscosity Controlling
Propanediol is the organic compound that conforms to the formula
Learn more about Propanediol →Acetyl Glucosamine
Skin Conditioning
Acetyl Glucosamine isn't fungal acne safe.
Learn more about Acetyl Glucosamine →Squalane
Hair Conditioning, Refatting, Skin Conditioning, Emollient
Squalane is a face oil.
Learn more about Squalane →Tocopherol
Antioxidant, Fragrance, Skin Conditioning, Occlusive
Tocopherol is vitamin E.
Learn more about Tocopherol →Acetyl Zingerone
Antioxidant, Chelating, Skin Protecting
Acetyl Zingerone is the organic compound that conforms to the formula:
Learn more about Acetyl Zingerone →Camellia Sinensis Leaf Vesicles
Skin Conditioning
Camellia Sinensis Leaf Vesicles are the vesicles isolated from the leaves of Camellia sinensis.
Learn more about Camellia Sinensis Leaf Vesicles →Hydroxyacetophenone
Antioxidant
Hydroxyacetophenone is the organic compound
Learn more about Hydroxyacetophenone →