Klairs Fundamental Watery Oil Drop vs The Inkey List 10% Azelaic Acid Serum for Redness Relief

Klairs

The Inkey List

A serum built around Hyaluronic acid, for hydration and barrier repair.

A serum built around Azelaic acid, for pollution defence and hydration.

Serum

28 ingredients

17 ingredients

Brand price

Not recorded · brand's site

Brand price

USD 20.00 · checked 26 Sept 2026 · brand's site

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At a Glance

Every check both products could be assessed on comes out the same. Tap any answer to see why.

Ceramide1
Skin-identical lipids that hold the barrier together.
Ceramide NP
Vitamin E1
Tocopherols — fat-soluble antioxidants.
Tocopheryl Acetate
Hyaluronic acid1
Hyaluronic acid and its salts; a humectant that binds water to the skin.
Sodium Hyaluronate
Copper peptides1
Copper-bound peptides studied for repair and firmness.
Copper Tripeptide-1

Polysorbates (Tween emulsifiers)1
Polysorbate (Tween) emulsifiers.
Polysorbate 60
Azelaic acid1
Works on acne, redness and pigmentation at once.
Azelaic Acid

Hydrating2
Boosts hydration and relieves dry, tight skin.
Glycerin, Propanediol
Barrier Repair2
Strengthens and restores the skin's natural barrier.
Allantoin, Glycerin
Reduces Irritation1
Eases discomfort and supports skin resilience.
Allantoin
Redness Reducing2
Soothes visible redness and calms irritation.
Allantoin, Azelaic Acid

May Trigger Acne1
Can clog pores or trigger breakouts.
Sorbitan Isostearate
May Worsen Seborrheic Dermatitis2
May feed the yeast involved in seborrheic dermatitis.
Polysorbate 60, Sorbitan Isostearate
May Worsen Keratosis Pilaris1
May clog follicles or strip skin prone to keratosis pilaris.
Sorbitan Isostearate

Show highlights for:

Aqua (in both products)
Solvent
0 / —
Glycerin (in both products)
Humectant
0 / 0
- Possibly animal-derived
- Hydrating
Butylene Glycol
Humectant
1 / 0
- Hydrating
Camellia Sinensis Leaf Water
Perfuming
Oryza Sativa Extract
Skin Conditioning
Bifida Ferment Extract
Humectant
Betaine
Humectant
0 / —
- Hydrating
Dipropylene Glycol
Perfuming
0-1 / —
Sorbitol
Humectant
0 / 0
- Hydrating
1,2-Hexanediol
Skin Conditioning

Aqua (in both products)
Solvent
0 / —
Azelaic Acid
Buffering
- Azelaic acid
- Acne Fighting
- Dark Spots
- Even Tone
- Redness Reducing
Propanediol
Viscosity Controlling
0-1 / —
- Hydrating
Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer
Emulsion Stabilising
Phenoxyethanol
Preservative
0 / —
Acacia Senegal Gum
Fragrance
Xanthan Gum (in both products)
Cleansing
0-1 / —
Allantoin
Skin Conditioning
0 / 0
- Reduces Irritation
- Smoothing
Glycerin (in both products)
Humectant
0 / 0
- Possibly animal-derived
- Hydrating
Ethylhexylglycerin (in both products)
Skin Conditioning

These ingredients are found in both products.

Ingredients higher up in an ingredient list are typically present in a larger amount.

Aqua
Solvent
Water
Learn more about Aqua →
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 →
Xanthan Gum
Binding, Emulsion Stabilising, Gel Forming, Skin Conditioning, Cleansing, Emulsifying, Viscosity Controlling
Xanthan gum
Learn more about Xanthan Gum →