Vitamin C Serum Ascorbic Acid 15%

Cos De BAHA

Vitamin C Serum Ascorbic Acid 15%

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About this product

The Cos De BAHA Vitamin C Serum Ascorbic Acid 15% is a emulsion. Our analysis of its 14 ingredients (13 low-risk) rates it Excellent (100/100). Based on its ingredients, it looks well-suited to oily / acne-prone, dry, and sensitive skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Emulsion
Ingredients
14
Low-risk
13
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 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 4/2
Good for dry skin
Momordica Charantia Fruit Extract Sodium Hyaluronate Camellia Sinensis Leaf Extract Aloe Barbadensis Leaf Extract
Caution for dry skin
Camellia Sinensis Leaf Extract Sodium Hydroxide
Oily/Acne-Prone Skin 1/0
Good for oily/acne-prone skin
Camellia Sinensis Leaf Extract
Sensitive Skin 4/2
Good for sensitive skin
Arbutin Sambucus Nigra Flower Extract Camellia Sinensis Leaf Extract Aloe Barbadensis Leaf Extract
Caution for sensitive skin
Arginine Camellia Sinensis Leaf Extract

Ingredients list

14 total
Lower hazard (1) Higher hazard (3)
All14 Skin Conditioning14 Humectant5 Hair Conditioning3 Antioxidant3 Tonic2 Masking2 Antistatic Agent2 Fragrance2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
3
B
Aloe Barbadensis Leaf Extract
(Emollient, Humectant, Oral Care Agent, Skin Conditioning)
Good for Sensitive Skin
Good for Sensitive Skin
ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning)
1
Arbutin
(Antioxidant, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
A
1,2-Hexanediol
(Solvent)
1
A
Arginine
(Fragrance, Hair Conditioning, Skin Conditioning, Antistatic Agent, Masking)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
A
Panthenol
(Antistatic Agent, Hair Conditioning, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
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)
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

Aloe Barbadensis Leaf Extract
Emollient, Humectant
ASCORBIC ACID
Antioxidant, Skin Conditioning
Arbutin
Antioxidant, Skin Conditioning
Arginine
Skin Conditioning
Sodium Hyaluronate
Skin Conditioning, Humectant
Panthenol
Skin Conditioning

Benefits

Fungal-acne (Malassezia) safe
Good for dry skin
Good for oily/acne-prone skin
Good for sensitive skin

Concerns

No major concerns flagged

Ingredients explained

Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
ASCORBIC ACID
Antioxidant, Buffering
Limited public safety data.Read moreShow less
EWG N/A AntioxidantBufferingFragranceSkin conditioning
1,2-Hexanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Solvent
Arginine
Fragrance, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceHair conditioningSkin conditioningAntistatic agentMasking
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
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
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
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Panthenol
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antistatic agentHair conditioningSkin conditioning 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.

Vitamin C (ascorbic) 5–20%

L-ascorbic acid is usually used at 5–20% (around 10–15% is common). Above ~20% adds little and tends to irritate more; it also needs a low pH to work.

ASCORBIC 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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