C-Tetra® Luxe Lipid Vitamin C Enhanced Radiance Serum

Medik8

C-Tetra® Luxe Lipid Vitamin C Enhanced Radiance Serum

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About this product

The Medik8 C-Tetra® Luxe Lipid Vitamin C Enhanced Radiance Serum is a serums, essence, ampoule. Our analysis of its 19 ingredients (8 low-risk) rates it Excellent (85/100). Based on its ingredients, it looks well-suited to dry skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
19
Low-risk
8
Fragrance
Fragrance-free
Origin
United Kingdom

The evidence

Quick Product Notes

Paraben-Free Sulfate-Free Alcohol-Free Silicone-Free EU Allergen-Free Fungal Acne (Malassezia) Safe

Notable Effects & Ingredients

No Notable Effects & Ingredients

Ingredients Related to Skin Types

Good   Bad — tap a skin type to see which ingredients · estimated from ingredient functions
Dry Skin 5/1
Good for dry skin
Passiflora Edulis Seed Oil Squalane Ethyl Linoleate PPG-12/SMDI Copolymer Dimethicone
Caution for dry skin
Candida Bombicola/Glucose/Methyl Rapeseedate Ferment
Oily/Acne-Prone Skin No data
Sensitive Skin 4/5
Good for sensitive skin
Candida Bombicola/Glucose/Methyl Rapeseedate Ferment Tetrahexyldecyl Ascorbate Dimethicone Tocopheryl Acetate
Caution for sensitive skin
Ethyl Linoleate Linalool Limonene Citral Geraniol

Ingredients list

19 total
Lower hazard (1) Higher hazard (7)
All19 Skin Conditioning15 Fragrance8 Emollient5 Perfuming4 Masking3 Deodorant3 Skin Protecting3 Antioxidant2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
A
Squalane
(Emollient, Hair Conditioning, Refatting, Skin Conditioning)
SIMMONDSIA CHINENSIS SEED OIL
(Hair Conditioning, Skin Conditioning, Skin Conditioning Emollient)
1
Tetrahexyldecyl Ascorbate
(Antioxidant, Skin Conditioning)
3
A
Dimethicone
(Antifoaming Agent, Skin Protecting, Emollient, Skin Conditioning)
Silicone
Silicone
1
Candida Bombicola/Glucose/Methyl Rapeseedate Ferment
(Antiacne Agent, Antimicrobial Agent, Cosmetic Biocide, Deodorant, Surfactant Cleansing Agent, Antiseborrhoeic, Skin Protecting)
citrus grandis peel oil
(Fragrance, Perfuming, Skin Conditioning)
1
Ethyl Linoleate
(Fragrance, Skin Conditioning, Emollient, Perfuming)
Fungal Acne
Fungal Acne Trigger
1
A
Passiflora Edulis Seed Oil
(Emollient)
3
Tocopheryl Acetate
(Antioxidant, Skin Conditioning)
Bad for Oily Skin
Bad for Oily Skin
Helianthus Annuus Seed Oil
(Fragrance, Skin Conditioning, Skin Conditioning Emollient)
Olea Europaea Fruit Oil
(Fragrance, Perfuming, Skin Conditioning)
Panax Ginseng Root Oil
(Skin Conditioning)
Prunus Amygdalus Dulcis Oil
(Skin Conditioning)
prunus armeniaca kernel oil
(Fragrance, Skin Conditioning)
1
PPG-12/SMDI Copolymer
(Emollient, Film Forming, Hair Fixing, Skin Conditioning)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens
7
Citral
(Flavoring Agent, Fragrance, Masking)
Allergens
Allergens
5
Linalool
(Fragrance, Deodorant, Masking)
Allergens
Allergens
7
Geraniol
(Fragrance, Masking, Tonic)
Allergens
Allergens

My Ingredient Notes

No personal ingredient notes yet. Save ingredients to your profile to get good/bad alerts here.

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Key ingredients

Squalane
Emollient, Skin Conditioning
SIMMONDSIA CHINENSIS SEED OIL
Skin Conditioning
Tetrahexyldecyl Ascorbate
Antioxidant, Skin Conditioning
Dimethicone
Skin Protecting, Emollient
Candida Bombicola/Glucose/Methyl Rapeseedate Ferment
Skin Protecting
citrus grandis peel oil
Skin Conditioning

Benefits

Good for dry skin

Concerns

Contains silicone
Contains eu allergen
Not fungal acne (malassezia) safe
Citral — higher EWG
Geraniol — higher EWG
May not suit sensitive skin

EWG flags hazard, not real-world risk — ratings don't account for how much of an ingredient a product contains. Treat these as things to research, not verdicts. How we score →

Ingredients explained

Squalane
Emollient, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientHair conditioningRefattingSkin conditioning
SIMMONDSIA CHINENSIS SEED OIL
Hair conditioning, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Hair conditioningSkin conditioningSkin conditioning emollient
Tetrahexyldecyl Ascorbate
Antioxidant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 AntioxidantSkin conditioning
Candida Bombicola/Glucose/Methyl Rapeseedate Ferment
Antiacne agent, Antimicrobial agent
Low-hazard ingredient.Read moreShow less
EWG 1 Antiacne agentAntimicrobial agentCosmetic biocideDeodorantSurfactant -cleansing agentAntiseborrhoeicSkin protecting
citrus grandis peel oil
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfumingSkin conditioning
Passiflora Edulis Seed Oil
Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emollient
Helianthus Annuus Seed Oil
Fragrance, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A FragranceSkin conditioningSkin conditioning emollient
Olea Europaea Fruit Oil
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfumingSkin conditioning
Panax Ginseng Root Oil
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Prunus Amygdalus Dulcis Oil
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
prunus armeniaca kernel oil
Fragrance, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A FragranceSkin conditioning
PPG-12/SMDI Copolymer
Emollient, Film forming
Low-hazard ingredient.Read moreShow less
EWG 1 EmollientFilm formingHair fixingSkin conditioning
Dimethicone
Antifoaming agent, Skin protecting
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Antifoaming agentSkin protectingEmollientSkin conditioning Silicone
Ethyl Linoleate
Fragrance, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 FragranceSkin conditioningEmollientPerfuming Fungal-acne trigger
Tocopheryl Acetate
Antioxidant, Skin conditioning
Potentially comedogenic - can block poresRead moreShow less
EWG 3 AntioxidantSkin conditioning Bad for Oily Skin
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens
Citral
Flavoring agent, Fragrance
Higher-hazard ingredient.Read moreShow less
EWG 7 Flavoring agentFragranceMasking Allergens
Linalool
Fragrance, Deodorant
Moderate-hazard ingredient.Read moreShow less
EWG 5 FragranceDeodorantMasking Allergens
Geraniol
Fragrance, Masking
Higher-hazard ingredient.Read moreShow less
EWG 7 FragranceMaskingTonic Allergens

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Morning works well: Antioxidants like vitamin C pair well with daytime use under sunscreen.

General guidance from this product's category and active ingredients — always follow the directions on the package.

Trust & honesty

Effective levels — general guide

The concentrations these actives are typically effective at in research — not a measurement of this product.

Vitamin C (ascorbic) 5–20%

L-ascorbic acid is usually used at 5–20% (around 10–15% is common). Above ~20% adds little and tends to irritate more; it also needs a low pH to work.

Tetrahexyldecyl Ascorbate

INCI lists don't disclose amounts, and we don't claim to know this product's levels — these are the ranges these ingredients are usually effective at, so you can tell a real formula from "fairy-dusting" a marketed active. How we estimate this.

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