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[ DemythSkin Verdict ]

Cos De BAHA

Cos De BAHA Azelaic Acid 20%

Name: Cos De BAHA Azelaic Acid 20%
Brand: Cos De BAHA

SerumAcne / Oil Control

Efficacy

Strong

4.4 / 5.0

Safety

Mostly Safe

4.2 / 5.0

System Verdict

This is a high-strength azelaic acid workhorse with solid supporting hydration and soothing, but the 20% level makes it a ‘handle with care’ treatment rather than a casual daily serum. At 20% and listed second in the INCI, azelaic acid is clearly present at a therapeutically meaningful concentration for acne, redness, and uneven tone, which strongly drives the efficacy score, while the emollient base, humectants, centella derivatives, panthenol, allantoin, and ceramide NP provide barrier support that helps you tolerate that strength; however, the very high azelaic load plus the use of propylene glycol and a basic pH-adjusted system means irritation potential is real, so this is best for experienced users, not sensitive beginners.

Active Ingredients Detected

S Tier: Gold StandardsHigh Clinical Proof | Skin-Transformative

Azelaic Acid

A Tier: Good BasicsProven Results

BetainePanthenolAllantoinMadecassosideSodium HyaluronateHydrolyzed Hyaluronic AcidTocopherolCeramide NP

B Tier: Supporting IngredientsPromising Ingredients

Dimethyl SulfoneDipotassium GlycyrrhizateCentella Asiatica ExtractCamellia Sinensis Leaf Extract

C Tier: Marketing IdolsHype | Limited or Weak Data

Sambucus Nigra Flower ExtractMomordica Charantia Fruit ExtractLeontopodium Alpinum Extract

What Each Ingredient Does

Water/Aqua: Primary solvent
Azelaic Acid: Multifunctional treating active
Propylene Glycol: Humectant and solvent
Sodium Hydroxide: pH adjuster/base
Caprylic/Capric Triglyceride: Emollient and texture enhancer
1,2-Hexanediol: Solvent and preservative booster
Cetearyl Alcohol: Fatty alcohol thickener/emollient
Glyceryl Stearate: Emulsifier and emollient
Dimethicone: Silicone emollient and skin protectant
Cetearyl Olivate: Emulsifier and texture enhancer
Sorbitan Olivate: Emulsifier and stabilizer
Betaine: Humectant and osmoprotectant
Dimethyl Sulfone: Solvent, possible soothing support
Panthenol: Humectant and soothing agent
Allantoin: Soothing and skin-conditioning agent
Dipotassium Glycyrrhizate: Soothing and antioxidant agent
Centella Asiatica Extract: Soothing and barrier-support extract
Madecassoside: Soothing centella-derived component
Sodium Hyaluronate: Hydrating humectant
Hydrolyzed Hyaluronic Acid: Hydrating humectant, smaller weight
Tocopherol: Antioxidant and skin-conditioning agent
Ceramide NP: Barrier lipid and moisturization support
Polysorbate 60: Solubilizer and emulsifier
Camellia Sinensis Leaf Extract: Antioxidant botanical extract

Full Ingredient List (INCI)

Water/Aqua, Azelaic Acid, Propylene Glycol, Sodium Hydroxide, Caprylic/Capric Triglyceride, 1,2-Hexanediol, Cetearyl Alcohol, Glyceryl Stearate, Dimethicone, Cetearyl Olivate, Sorbitan Olivate, Betaine, Dimethyl Sulfone, Panthenol, Allantoin, Dipotassium Glycyrrhizate, Centella Asiatica Extract, Madecassoside, Sodium Hyaluronate, Hydrolyzed Hyaluronic Acid, Tocopherol, Ceramide NP, Polysorbate 60, Camellia Sinensis Leaf Extract, Sambucus Nigra Flower Extract, Momordica Charantia Fruit Extract, Leontopodium Alpinum Extract

Frequently Asked

Is Cos De BAHA Azelaic Acid 20% worth it?

Cos De BAHA Azelaic Acid 20% scores 4.4 out of 5.0 for efficacy (Strong) and 4.2 out of 5.0 for safety (Mostly Safe) on DemythSkin's independent ingredient analysis. This is a high-strength azelaic acid workhorse with solid supporting hydration and soothing, but the 20% level makes it a ‘handle with care’ treatment rather than a casual daily serum. At 20% and listed second in the INC

What are the key active ingredients in Cos De BAHA Azelaic Acid 20%?

Cos De BAHA Azelaic Acid 20% contains these gold-standard actives with strong clinical evidence: Azelaic Acid.

Does Cos De BAHA Azelaic Acid 20% contain fragrance or known irritants?

DemythSkin's analysis found no flagged irritants in Cos De BAHA Azelaic Acid 20%. It scores 4.2 out of 5.0 for safety.

How is Cos De BAHA Azelaic Acid 20% scored?

DemythSkin grades every product on two independent axes: efficacy (whether the ingredients have clinical evidence of working) and safety (irritation and sensitisation risk). Ingredients are classified S through D against a database of over 3,000 compounds. No brand pays for a score.

Analyze on DemythSkin →

Analysis last updated: 2026-09-17. DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score.