15% Vitamin C + Ferulic Acid High-Potency Antioxidant Brightening Serum

CosMD

15% Vitamin C + Ferulic Acid High-Potency Antioxidant Brightening Serum

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About this product

The CosMD 15% Vitamin C + Ferulic Acid High-Potency Antioxidant Brightening Serum is a serums, essence, ampoule. Our analysis of its 14 ingredients (12 low-risk) rates it Excellent (97/100). Based on its ingredients, it looks well-suited to dry skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
14
Low-risk
12
Fragrance
Fragrance-free
Origin
Thailand
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 4/1
Good for dry skin
Ethoxydiglycol Sodium Hyaluronate Glycerin Propylene Glycol
Caution for dry skin
Glycerin
Oily/Acne-Prone Skin No data
Sensitive Skin 3/4
Good for sensitive skin
Glycerin Ferulic Acid Allantoin
Caution for sensitive skin
Ethoxydiglycol Glycerin Propylene Glycol Phenoxyethanol

Ingredients list

14 total
Lower hazard (1) Higher hazard (4)
All14 Skin Conditioning9 Humectant6 Solvent4 Fragrance4 Viscosity Decreasing Agent3 Viscosity Controlling3 Skin Protecting3 Film Forming2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
3-O-ETHYL ASCORBIC ACID
(Skin Conditioning)
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
2
A
Glycerin
(Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care Agent, Oral Health Care Drug, Skin Protecting, Viscosity Decreasing Agent, Perfuming, Solvent)
Good for Dry Skin
Good for Dry Skin
Fungal Acne
Fungal Acne Trigger
1
A
Ethoxydiglycol
(Fragrance, Solvent, Viscosity Decreasing Agent, Humectant, Perfuming)
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
2
Ferulic Acid
(Antioxidant, Preservative, Uv Absorber, Antimicrobial)
1
A
Hydroxyethylcellulose
(Binding Agent, Emulsion Stabilising, Film Forming, Viscosity Increasing Agent, Binding, Stabilising, Viscosity Controlling)
3
A
Aminomethyl Propanol
(Ph Adjuster, Buffering Agent)
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
Disodium EDTA
(Chelating Agent, Viscosity Controlling)
1
A
Panthenol
(Antistatic Agent, Hair Conditioning, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
A
Ethylhexylglycerin
(Deodorant, 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

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

Benefits

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

Concerns

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

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
3-O-ETHYL ASCORBIC ACID
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Ethoxydiglycol
Fragrance, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSolventViscosity decreasing agentHumectantPerfuming
Ferulic Acid
Antioxidant, Preservative
Low-hazard ingredient.Read moreShow less
EWG 2 AntioxidantPreservativeUv absorberAntimicrobial
Hydroxyethylcellulose
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingFilm formingViscosity increasing agentBindingStabilisingViscosity controlling
Aminomethyl Propanol
Ph adjuster, Buffering agent
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Ph adjusterBuffering agent
Disodium EDTA
Chelating agent, Viscosity controlling
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Chelating agentViscosity controlling
Ethylhexylglycerin
Deodorant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A DeodorantSkin 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
Glycerin
Denaturant, Fragrance
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A DenaturantFragranceHair conditioningHumectantOral care agentOral health care drugSkin protectingViscosity decreasing agentPerfumingSolvent Good for Dry SkinFungal-acne trigger
Phenoxyethanol
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben
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
Panthenol
Antistatic agent, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Antistatic agentHair conditioningSkin 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

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.

3-O-ETHYL 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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