Azelaic Acid 10 Serum

Cos De BAHA

Where to buy Possibly in stock

About this product

The Cos De BAHA Azelaic Acid 10 Serum is a emulsion. Our analysis of its 15 ingredients (15 low-risk) rates it Excellent (100/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Emulsion
Ingredients
15
Low-risk
15
Fragrance
Fragrance-free
Origin
South Korea
Data updated
Jun 2026

The evidence

Quick Product Notes

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

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 5/2
Good for dry skin
Momordica Charantia Fruit Extract Sodium Hyaluronate Propylene Glycol Camellia Sinensis Leaf Extract Aloe Barbadensis Leaf Extract
Caution for dry skin
Camellia Sinensis Leaf Extract Polysorbate 20
Oily/Acne-Prone Skin 2/0
Good for oily/acne-prone skin
Azelaic Acid Camellia Sinensis Leaf Extract
Sensitive Skin 3/4
Good for sensitive skin
Sambucus Nigra Flower Extract Camellia Sinensis Leaf Extract Aloe Barbadensis Leaf Extract
Caution for sensitive skin
Sodium Citrate Azelaic Acid Propylene Glycol Camellia Sinensis Leaf Extract

Ingredients list

15 total
Lower hazard (1) Higher hazard (3)
All15 Skin Conditioning11 Humectant7 Solvent4 Hair Conditioning3 Masking3 Tonic2 Oral Care Agent2 Emollient2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
3
B
Propylene Glycol
(Fragrance, Humectant, Skin Conditioningagent Miscellaneous, Solvent, Viscosity Decreasing Agent, Skin Conditioning, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
1
A
Azelaic Acid
(Fragrance, Ph Adjuster, Buffering Agent, Masking)
3
B
Polysorbate 20
(Emulsifying, Surfactant)
Fungal Acne
Fungal Acne Trigger
1
A
1,2-Hexanediol
(Solvent)
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
A
Panthenol
(Antistatic Agent, Hair Conditioning, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
1
3
B
Aloe Barbadensis Leaf Extract
(Emollient, Humectant, Oral Care Agent, Skin Conditioning)
Good for Sensitive Skin
Good for Sensitive Skin
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
A
Sodium Citrate
(Ph Adjuster, Buffering Agent, Chelating, Masking)
1
B
Camellia Sinensis Leaf Extract
(Antimicrobial, Antioxidant, Astringent, Emollient, Humectant, Masking, Oral Care Agent, Skin Conditioning, Skin Protecting, Tonic, Uv Absorber)
Good for Oily Skin
Good for Oily Skin
1
Momordica Charantia Fruit Extract
(Hair Conditioning, Humectant, Skin Conditioning)
1
Sambucus Nigra Flower Extract
(Refreshing, Skin Conditioning, Soothing, Tonic)
1
Leontopodium Alpinum Extract
(Skin Conditioning)

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

Hyaluronic Acid
Hydrates by attracting and holding water.
Azelaic Acid
Gently exfoliates and reduces inflammation.
Antioxidants
Shields skin from free radical damage.
Exfoliators
Removes dead skin cells to smoothe texture.

Benefits

Barrier RepairStrengthen and restore your skin's natural barrier.
HydratingBoosts hydration and relieves dry, tight skin.
Redness ReducingSoothes visible redness and calms irritation.
Reduces IrritationEases discomfort and supports skin resilience.
Scar HealingImproves the look of marks and scars.
Good For Oily SkinBalances oil and helps reduce shine.
Reduces Large PoresMinimizes the look of enlarged pores.
Dark SpotsFades dark spots for even skin tone.

Concerns

Not fungal acne (malassezia) safe
May not suit sensitive skin

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Azelaic Acid
Fragrance, Ph adjuster
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragrancePh adjusterBuffering agentMasking
1,2-Hexanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Solvent
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Sodium Citrate
Ph adjuster, Buffering agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Ph adjusterBuffering agentChelatingMasking
Momordica Charantia Fruit Extract
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningHumectantSkin conditioning
Sambucus Nigra Flower Extract
Refreshing, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 RefreshingSkin conditioningSoothingTonic
Leontopodium Alpinum Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Propylene Glycol
Fragrance, Humectant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B FragranceHumectantSkin-conditioningagent - miscellaneousSolventViscosity decreasing agentSkin conditioningViscosity controlling Good for Dry Skin
Polysorbate 20
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant Fungal-acne trigger
Panthenol
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antistatic agentHair conditioningSkin conditioning Good for Dry Skin
Aloe Barbadensis Leaf Extract
Emollient, Humectant
Low-to-moderate hazard.Read moreShow less
EWG 1–3 CIR B EmollientHumectantOral care agentSkin conditioning Good for Sensitive Skin
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Camellia Sinensis Leaf Extract
Antimicrobial, Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B AntimicrobialAntioxidantAstringentEmollientHumectantMaskingOral care agentSkin conditioningSkin protectingTonicUv absorber Good for Oily Skin

How to use

How to use

  • 1 Morning only: Apply as the last step of your AM routine, after moisturiser, and reapply every ~2 hours of sun exposure.

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.

Niacinamide 2–5% (up to 10%)

Most research uses 2–5%; some formulas go to 10%. Very high levels can cause flushing in sensitive skin.

Niacinamide

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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