The Inkey List
10% Azelaic Acid Serum for Redness ReliefMedik8
C-Tetra® AdvancedA serum built around Azelaic acid, for pollution defence and hydration.
A serum built around Vitamin C derivative and Vitamin C, for barrier repair and hydration.
Brand price
USD 20.00 · checked 26 Sept 2026 · brand's site
Brand price
GBP 72.00 · checked 8 Oct 2026 · brand's site
At a Glance
They come out differently on Fragrance-free, EU-allergen-free and Pore-clogger-free; those rows are shaded. Tap any answer to see why.
Key Ingredients
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
Concerns
May Worsen Seborrheic Dermatitis2
May feed the yeast involved in seborrheic dermatitis.
May Worsen Keratosis Pilaris1
May clog follicles or strip skin prone to keratosis pilaris.
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.
Ingredients Side-by-side
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer (in both products)
Emulsion Stabilising
Fragrance
Ethylhexylglycerin (in both products)
Skin Conditioning
Antioxidant
- Fatty alcohols (Malassezia)
- Vitamin C
- Vitamin C derivative (stable)
- Antioxidant
- Brightening
- Dark Spots
- May Worsen Seborrheic Dermatitis
Emollient
Skin Conditioning
- Fatty alcohols (Malassezia)
- Dark Spots
- Hydrating
- May Worsen Seborrheic Dermatitis
Occlusive
0-3 / 3
- Vitamin E
- Anti-Pollution
- Antioxidant
- May Trigger Acne
- May Worsen Irritation
- May Worsen Keratosis Pilaris
Antioxidant
Camellia Sinensis Leaf Vesicles
Skin Conditioning
Antioxidant
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Aqua
Solvent
Propanediol
Solvent, Viscosity Controlling
Propanediol is the organic compound that conforms to the formula
Learn more about Propanediol →Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Emulsion Stabilising, Viscosity Controlling
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer is a copolymer of sodium hydroxyethyl acrylate and acryloyldimethyl taurate monomers
Learn more about Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer →Phenoxyethanol
Antimicrobial, Preservative
Phenoxyethanol is the aromatic ether alcohol that conforms to the formula:
Learn more about Phenoxyethanol →Xanthan Gum
Binding, Emulsion Stabilising, Gel Forming, Skin Conditioning, Cleansing, Emulsifying, Viscosity Controlling
Xanthan gum
Learn more about Xanthan Gum →Glycerin
Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care, Perfuming, Humectant, Skin Protecting, Solvent, Viscosity Controlling
Glycerin may be plant, synthetic or animal depending on the supplier.
Learn more about Glycerin →Ethylhexylglycerin
Deodorant, Skin Conditioning
Ethylhexylglycerin is the organic compound that conforms to the formula
Learn more about Ethylhexylglycerin →Polysorbate 60
Cleansing, Emulsifying
Polysorbate 60 isn't fungal acne safe.
Learn more about Polysorbate 60 →Sorbitan Isostearate
Emulsifying
Sorbitan Isostearate isn't fungal acne safe.
Learn more about Sorbitan Isostearate →
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