2% Hydroquinone + Arbutin + Niacinamide 4% Serum

Cos De BAHA

2% Hydroquinone + Arbutin + Niacinamide 4% Serum

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About this product

The Cos De BAHA 2% Hydroquinone + Arbutin + Niacinamide 4% Serum is a serums, essence, ampoule. Our analysis of its 18 ingredients (11 low-risk) rates it Excellent (84/100). 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
Serums, Essence, Ampoules
Ingredients
18
Low-risk
11
Fragrance
Fragrance-free
Origin
South Korea
Data updated
May 2026

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 3/1
Good for dry skin
Sodium Hyaluronate Lactic Acid Aloe Barbadensis Leaf Extract
Caution for dry skin
Salicylic Acid
Oily/Acne-Prone Skin 1/0
Good for oily/acne-prone skin
Salicylic Acid
Sensitive Skin 4/6
Good for sensitive skin
Arbutin Kojic Acid Hydroquinone Aloe Barbadensis Leaf Extract
Caution for sensitive skin
Kojic Acid Sodium Citrate Salicylic Acid Citric Acid Lactic Acid Hydroquinone

Ingredients list

18 total
Lower hazard (1) Higher hazard (9)
All18 Skin Conditioning14 Fragrance4 Humectant3 Antioxidant3 Masking3 Buffering Agent3 Ph Adjuster3 Solvent2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
3
B
Aloe Barbadensis Leaf Extract
(Emollient, Humectant, Oral Care Agent, Skin Conditioning)
Good for Sensitive Skin
Good for Sensitive Skin
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
Arbutin
(Antioxidant, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
1
A
1,2-Hexanediol
(Solvent)
9
Hydroquinone
(Antioxidant, Fragrance, Hair Dyeing Reducing, Skin Bleaching Agent, Hair Dyeing)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
A
Sodium Citrate
(Ph Adjuster, Buffering Agent, Chelating, Masking)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
4
B
Salicylic Acid
(Antiacne Agent, Antidandruff Agent, Corn/Callus/Wart Remover, Denaturant, Exfoliant, Fragrance, Hair Conditioning, Skin Conditioning, Keratolytic, Masking, Preservative)
Good for Oily Skin
Good for Oily Skin
Bad for Sensitive Skin
Bad for Sensitive Skin
6
7
B
Kojic Acid
(Antioxidant)
Good for Dry Skin
Good for Dry Skin
4
B
Lactic Acid
(Exfoliant, Fragrance, Humectant, Ph Adjuster, Skin Conditioning Agent Humectant, Skin Conditioning, Buffering Agent)
Bad for Sensitive Skin
Bad for Sensitive Skin
HAMAMELIS VIRGINIANA LEAF EXTRACT
(Skin Conditioning)
rosmarinus officinalis extract
(Antimicrobial, Refreshing, Tonic)
1
Eucalyptus Globulus Leaf
(Skin Conditioning)
Thymus Vulgaris Extract
(Perfuming, Skin Conditioning)
1
Aspalathus Linearis Extract
(Skin Conditioning)
1
A
Disodium EDTA
(Chelating Agent, Viscosity Controlling)

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

Antioxidants
Shields skin from free radical damage.
BHA
Unclogs pores and reduces excess oil.
Niacinamide
Strengthens, smooths, and brightens skin.
Hyaluronic Acid
Hydrates by attracting and holding water.
Kojic Acid
Brightens skin and helps fade dark spots.
Arbutin
Gently brightens and evens skin tone.
Show all 6 key ingredients

Benefits

HydratingBoosts hydration and relieves dry, tight skin.
BrighteningRestores radiance to dull, tired skin.
Dark SpotsFades dark spots for even skin tone.
Redness ReducingSoothes visible redness and calms irritation.
Scar HealingImproves the look of marks and scars.
Barrier RepairStrengthen and restore your skin's natural barrier.
Acne FightingFights acne and helps prevent breakouts.
Anti-AgingSoftens lines and helps skin look youthful.

Concerns

Hydroquinone — higher EWG
Kojic Acid — 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

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
1,2-Hexanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Solvent
Sodium Citrate
Ph adjuster, Buffering agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Ph adjusterBuffering agentChelatingMasking
HAMAMELIS VIRGINIANA LEAF EXTRACT
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
rosmarinus officinalis extract
Antimicrobial, Refreshing
Limited public safety data.Read moreShow less
EWG N/A AntimicrobialRefreshingTonic
Eucalyptus Globulus Leaf
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Thymus Vulgaris Extract
Perfuming, Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A PerfumingSkin conditioning
Aspalathus Linearis Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Disodium EDTA
Chelating agent, Viscosity controlling
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Chelating agentViscosity controlling
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
Arbutin
Antioxidant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 AntioxidantSkin conditioning Good for Dry Skin
Hydroquinone
Antioxidant, Fragrance
Higher-hazard ingredient.Read moreShow less
EWG 9 AntioxidantFragranceHair dyeing reducingSkin bleaching agentHair dyeing
Citric Acid
Chelating agent, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 2 CIR A Chelating agentFragrancePh adjusterBuffering agentMasking Bad for Sensitive Skin
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Salicylic Acid
Antiacne agent, Antidandruff agent
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B Antiacne agentAntidandruff agentCorn/callus/wart removerDenaturantExfoliantFragranceHair conditioningSkin conditioningKeratolyticMaskingPreservative Good for Oily SkinBad for Sensitive Skin
Kojic Acid
Antioxidant
Higher-hazard ingredient.Read moreShow less
EWG 6–7 CIR B Antioxidant Good for Dry Skin
Lactic Acid
Exfoliant, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B ExfoliantFragranceHumectantPh adjusterSkin-conditioning agent -humectantSkin conditioningBuffering agent Bad for Sensitive Skin

How to use

How to use

  • 1 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 Evening, start slow: Best in the PM a few times a week to begin with; avoid layering with other strong actives the same night.
  • 3 Wear SPF the next day: Acids and retinoids increase sun sensitivity — daily sunscreen is a must while using this.

General guidance from this product's category and active ingredients — always follow the directions on the package.

Trust & honesty

Pregnancy & breastfeeding

Contains ingredients some choose to avoid or double-check while pregnant or nursing.

Often avoided
Hydroquinone (Hydroquinone)

Commonly advised to avoid in pregnancy because a relatively high proportion is absorbed through the skin.

Use with caution
BHA (salicylic) (Salicylic Acid)

Low-strength topical salicylic acid (BHA) is generally considered fine. Caution is usually reserved for high-strength leave-on products and salicylic peels.

This is general information, not medical advice. Pregnancy guidance varies and depends on concentration and your individual situation — always check with your doctor, midwife or pharmacist. How we flag this.

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

BHA (salicylic) 0.5–2%

Salicylic acid is OTC-capped at 2%; 0.5–2% is the usual leave-on range. Much below that it acts more as a soothing agent than an exfoliant.

Salicylic Acid

AHA (acid exfoliant) 5–10% (OTC)

OTC leave-on AHAs are usually 5–10%. The effect also depends on pH and free-acid value, not the percentage alone.

Lactic Acid

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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