C-Tetra Day Cream

Medik8

Where to buy Possibly in stock

About this product

The Medik8 C-Tetra Day Cream is a moisturizer. Our analysis of its 26 ingredients (17 low-risk) rates it Excellent (87/100). 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
Moisturizers
Ingredients
26
Low-risk
17
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 7/5
Good for dry skin
Cetearyl Isononanoate Caprylic/Capric Triglyceride Caprylyl Glycol Sodium Hyaluronate Glycerin Sodium Polyacrylate Heptyl Undecylenate
Caution for dry skin
Distarch Phosphate Sorbitan Olivate Glycerin Sodium Polyacrylate Sodium Hydroxide
Oily/Acne-Prone Skin No data
Sensitive Skin 3/9
Good for sensitive skin
Glycerin Tetrahexyldecyl Ascorbate Tocopheryl Acetate
Caution for sensitive skin
Pelargonium Graveolens Flower Oil Caprylic/Capric Triglyceride Glycerin Phenylpropanol Linalool Citronellol Limonene Citral Geraniol

Ingredients list

26 total
Lower hazard (1) Higher hazard (7)
All26 Skin Conditioning14 Fragrance8 Masking7 Perfuming7 Solvent6 Emollient4 Hair Conditioning4 Humectant4
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
B
Heptyl Undecylenate
(Emollient)
1
A
Caprylic/Capric Triglyceride
(Emollient, Masking, Perfuming, Skin Conditioning, Solvent)
1
Tetrahexyldecyl Ascorbate
(Antioxidant, Skin Conditioning)
1
Methylpropanediol
(Solvent)
1
B
Cetearyl Olivate
(Hair Conditioning)
1
B
Cetearyl Isononanoate
(Hair Conditioning, Skin Conditioning, Emollient)
1
Distarch Phosphate
(Anticaking Agent, Binding Agent, Absorbent, Binding)
3
Tocopheryl Acetate
(Antioxidant, Skin Conditioning)
Bad for Oily Skin
Bad for Oily Skin
3
B
Sodium Polyacrylate
(Absorbent, Emulsion Stabilising, Film Forming, Hair Fixing, Skin Conditioning Agent Emollient, Viscosity Controlling Agent, Viscosity Increasing Agent, Binding, Skin Conditioning)
1
A
Sorbitan Olivate
(Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
2
A
Glycerin
(Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care Agent, Oral Health Care Drug, Skin Protecting, Viscosity Decreasing Agent, Perfuming, Solvent)
Good for Dry Skin
Good for Dry Skin
Fungal Acne
Fungal Acne Trigger
1
A
Disodium EDTA
(Chelating Agent, Viscosity Controlling)
1
Phenylpropanol
(Masking, Perfuming, Solvent)
citrus grandis peel oil
(Fragrance, Perfuming, Skin Conditioning)
Citrus Limon Peel Oil
(Fragrance, Perfuming, Skin Conditioning)
Citrus Aurantium Bergamia Fruit Oil
(Fragrance, Perfuming)
1
Pelargonium Graveolens Flower Oil
(Masking)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens
5
Citronellol
(Fragrance, Masking)
Allergens
Allergens
5
Linalool
(Fragrance, Deodorant, Masking)
Allergens
Allergens
7
Geraniol
(Fragrance, Masking, Tonic)
Allergens
Allergens
7
Citral
(Flavoring Agent, Fragrance, Masking)
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

Heptyl Undecylenate
Emollient
Caprylic/Capric Triglyceride
Emollient, Skin Conditioning
Tetrahexyldecyl Ascorbate
Antioxidant, Skin Conditioning
Cetearyl Isononanoate
Skin Conditioning, Emollient
Tocopheryl Acetate
Antioxidant, Skin Conditioning
Sodium Polyacrylate
Skin Conditioning

Benefits

Good for dry skin

Concerns

Contains eu allergen
Not fungal acne (malassezia) safe
Geraniol — higher EWG
Citral — 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

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Heptyl Undecylenate
Emollient
Limited public safety data.Read moreShow less
EWG N/A CIR B Emollient
Caprylic/Capric Triglyceride
Emollient, Masking
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientMaskingPerfumingSkin conditioningSolvent
Tetrahexyldecyl Ascorbate
Antioxidant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 AntioxidantSkin conditioning
Methylpropanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Cetearyl Olivate
Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Hair conditioning
Cetearyl Isononanoate
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Hair conditioningSkin conditioningEmollient
Distarch Phosphate
Anticaking agent, Binding agent
Low-hazard ingredient.Read moreShow less
EWG 1 Anticaking agentBinding agentAbsorbentBinding
Sodium Polyacrylate
Absorbent, Emulsion stabilising
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B AbsorbentEmulsion stabilisingFilm formingHair fixingSkin-conditioning agent -emollientViscosity controlling agentViscosity increasing agentBindingSkin conditioning
Caprylyl Glycol
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningEmollientHumectant
Disodium EDTA
Chelating agent, Viscosity controlling
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Chelating agentViscosity controlling
Phenylpropanol
Masking, Perfuming
Low-hazard ingredient.Read moreShow less
EWG 1 MaskingPerfumingSolvent
citrus grandis peel oil
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfumingSkin conditioning
Citrus Limon Peel Oil
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfumingSkin conditioning
Citrus Aurantium Bergamia Fruit Oil
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfuming
+ 2 more — see the full ingredients list above
Tocopheryl Acetate
Antioxidant, Skin conditioning
Potentially comedogenic - can block poresRead moreShow less
EWG 3 AntioxidantSkin conditioning Bad for Oily Skin
Sorbitan Olivate
Emulsifying, Surfactant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmulsifyingSurfactant Fungal-acne trigger
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Glycerin
Denaturant, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A DenaturantFragranceHair conditioningHumectantOral care agentOral health care drugSkin protectingViscosity decreasing agentPerfumingSolvent Good for Dry SkinFungal-acne trigger
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens
Citronellol
Fragrance, Masking
Moderate-hazard ingredient.Read moreShow less
EWG 5 FragranceMasking 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
Citral
Flavoring agent, Fragrance
Higher-hazard ingredient.Read moreShow less
EWG 7 Flavoring agentFragranceMasking Allergens

How to use

How to use

  • 1 Where it fits: Apply near the end of your routine, after thinner serums.
  • 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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