Vitamin C Facial Serum With MSM

Cos De BAHA

Where to buy Possibly in stock

About this product

The Cos De BAHA Vitamin C Facial Serum With MSM is a serums, essence, ampoule. Our analysis of its 20 ingredients (20 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
Serums, Essence, Ampoules
Ingredients
20
Low-risk
20
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

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 7/3
Good for dry skin
Glycereth-26 Dipotassium Glycyrrhizate Betaine Momordica Charantia Fruit Extract Sodium Hyaluronate Camellia Sinensis Leaf Extract Aloe Barbadensis Leaf Extract
Caution for dry skin
Xanthan Gum Hydrogenated Lecithin Camellia Sinensis Leaf Extract
Oily/Acne-Prone Skin 2/0
Good for oily/acne-prone skin
Sodium Ascorbyl Phosphate Camellia Sinensis Leaf Extract
Sensitive Skin 7/2
Good for sensitive skin
Sodium Ascorbyl Phosphate Sambucus Nigra Flower Extract Ferulic Acid Camellia Sinensis Leaf Extract Tocopheryl Acetate Allantoin Aloe Barbadensis Leaf Extract
Caution for sensitive skin
Citric Acid Camellia Sinensis Leaf Extract

Ingredients list

20 total
Lower hazard (1) Higher hazard (3)
All20 Skin Conditioning19 Humectant9 Viscosity Controlling6 Solvent4 Antioxidant4 Emulsion Stabilising4 Viscosity Decreasing Agent3 Skin Protecting3
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
A
Sodium Ascorbyl Phosphate
(Antioxidant)
1
Glycereth-26
(Humectant, Viscosity Decreasing Agent, Solvent, Viscosity Controlling)
1
Dimethyl Sulfone
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
A
1,2-Hexanediol
(Solvent)
1
B
Betaine
(Hair Conditioning, Humectant, Antistatic Agent, Skin Conditioning, Viscosity Controlling)
2
A
Hydrogenated Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Suspending Agent Nonsurfactant)
3
Tocopheryl Acetate
(Antioxidant, Skin Conditioning)
Bad for Oily Skin
Bad for Oily Skin
2
Ferulic Acid
(Antioxidant, Preservative, Uv Absorber, Antimicrobial)
1
A
Allantoin
(Skin Conditioning, Skin Protecting, Soothing)
Good for Oily Skin
Good for Oily Skin
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
Dipotassium Glycyrrhizate
(Flavoring Agent, Skin Conditioning, Humectant)
1
A
Hydroxyethylcellulose
(Binding Agent, Emulsion Stabilising, Film Forming, Viscosity Increasing Agent, Binding, Stabilising, Viscosity Controlling)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
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
Sambucus Nigra Flower Extract
(Refreshing, Skin Conditioning, Soothing, Tonic)
1
Momordica Charantia Fruit Extract
(Hair Conditioning, Humectant, Skin Conditioning)
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

Antioxidants
Shields skin from free radical damage.
Vitamin C
Brightens, evens tone, and supports collagen.
Vitamin E
Protects skin and soothes irritation.
Hyaluronic Acid
Hydrates by attracting and holding water.

Benefits

HydratingBoosts hydration and relieves dry, tight skin.
Redness ReducingSoothes visible redness and calms irritation.
Reduces IrritationEases discomfort and supports skin resilience.
Barrier RepairStrengthen and restore your skin's natural barrier.
BrighteningRestores radiance to dull, tired skin.
Anti-AgingSoftens lines and helps skin look youthful.
Scar HealingImproves the look of marks and scars.
Reduces Large PoresMinimizes the look of enlarged pores.

Concerns

No major concerns flagged

Ingredients explained

Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Sodium Ascorbyl Phosphate
Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antioxidant
Glycereth-26
Humectant, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 HumectantViscosity decreasing agentSolventViscosity controlling
Dimethyl Sulfone
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
1,2-Hexanediol
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Solvent
Betaine
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Hair conditioningHumectantAntistatic agentSkin conditioningViscosity controlling
Hydrogenated Lecithin
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A Skin conditioningEmulsifyingSurfactantSuspending agent- nonsurfactant
Ferulic Acid
Antioxidant, Preservative
Low-hazard ingredient.Read moreShow less
EWG 2 AntioxidantPreservativeUv absorberAntimicrobial
Dipotassium Glycyrrhizate
Flavoring agent, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Flavoring agentSkin conditioningHumectant
Hydroxyethylcellulose
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingFilm formingViscosity increasing agentBindingStabilisingViscosity controlling
Xanthan Gum
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingSkin conditioningSurfactant -emulsifying agentViscosity increasing agentBindingGel formingViscosity controlling
Sambucus Nigra Flower Extract
Refreshing, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 RefreshingSkin conditioningSoothingTonic
Momordica Charantia Fruit Extract
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningHumectantSkin conditioning
Leontopodium Alpinum Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
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
Tocopheryl Acetate
Antioxidant, Skin conditioning
Potentially comedogenic - can block poresRead moreShow less
EWG 3 AntioxidantSkin conditioning Bad for Oily Skin
Allantoin
Skin conditioning, Skin protecting
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSkin protectingSoothing Good for Oily SkinGood for Sensitive Skin
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
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
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 Where it fits: Apply after toner and before moisturiser — thinnest to thickest.
  • 2 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.

Sodium Ascorbyl Phosphate

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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