AHA/BHA Refresh Vitamin C Booster Serum

CosRX

AHA/BHA Refresh Vitamin C Booster Serum

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About this product

The CosRX AHA/BHA Refresh Vitamin C Booster Serum is a serums, essence, ampoule. Our analysis of its 24 ingredients (19 low-risk) rates it Excellent (98/100). 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
24
Low-risk
19
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 4/4
Good for dry skin
Betaine Butylene Glycol Sodium Hyaluronate Glycerin
Caution for dry skin
Glycerin Polyglyceryl-10 Laurate Polyglyceryl-10 Myristate Sodium Hydroxide
Oily/Acne-Prone Skin 1/0
Good for oily/acne-prone skin
Betaine Salicylate
Sensitive Skin 4/5
Good for sensitive skin
Ascorbyl Glucoside Alpha-Arbutin Glycerin Allantoin
Caution for sensitive skin
Menthyl Lactate Butylene Glycol Glycerin Mentha Haplocalix Extract Hippophae Rhamnoides Water

Ingredients list

24 total
Lower hazard (1) Higher hazard (4)
All24 Skin Conditioning20 Humectant6 Skin Protecting4 Masking4 Fragrance4 Solvent4 Hair Conditioning4 Perfuming3
EWG CIR Ingredient Name & Cosmetic Functions Notes
Actinidia Chinensis Fruit Extract
(Skin Conditioning, Skin Conditioning Emollient)
hylocereus undatus fruit extract
(Skin Conditioning, Skin Protecting)
Hippophae Rhamnoides Water
(Flavoring Agent, Masking, Perfuming, Skin Conditioning)
1
A
Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
1
A
1,2-Hexanediol
(Solvent)
4
B
Glycolic Acid
(Exfoliant, Ph Adjuster, Buffering Agent)
Good for Oily Skin
Good for Oily Skin
Bad for Sensitive Skin
Bad for Sensitive Skin
1
B
Betaine
(Hair Conditioning, Humectant, Antistatic Agent, Skin Conditioning, Viscosity Controlling)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
1
Water
(Solvent)
1
A
Panthenol
(Antistatic Agent, Hair Conditioning, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
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
Hydroxyethylcellulose
(Binding Agent, Emulsion Stabilising, Film Forming, Viscosity Increasing Agent, Binding, Stabilising, Viscosity Controlling)
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
Polyglyceryl-10 Myristate
(Skin Conditioning, Emulsifying, Surfactant)
1
B
Polyglyceryl-10 Laurate
(Skin Conditioning, Emulsifying, Surfactant)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
Adenosine
(Skin Conditioning)
1
Ascorbyl Glucoside
(Antioxidant)
Citrus Aurantium Bergamia Fruit Oil
(Fragrance, Perfuming)
1
Betaine Salicylate
(Antimicrobial Agent, Exfoliant, Keratolytic)
1
Alpha-Arbutin
(Antioxidant, Skin Conditioning)
1
Menthyl Lactate
(Flavoring Agent, Fragrance, Masking, Refreshing)
1
Mentha Haplocalix Extract
(Masking)

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.
AHA
Exfoliates skin for a brighter complexion.
BHA
Unclogs pores and reduces excess oil.
Vitamin C
Brightens, evens tone, and supports collagen.
Niacinamide
Strengthens, smooths, and brightens skin.
Hyaluronic Acid
Hydrates by attracting and holding water.
Arbutin
Gently brightens and evens skin tone.
Exfoliators
Removes dead skin cells to smoothe texture.

Benefits

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

Concerns

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

Ingredients explained

Actinidia Chinensis Fruit Extract
Skin conditioning, Skin conditioning emollient
Limited public safety data.Read moreShow less
EWG N/A Skin conditioningSkin conditioning emollient
hylocereus undatus fruit extract
Skin conditioning, Skin protecting
Limited public safety data.Read moreShow less
EWG N/A Skin conditioningSkin protecting
Hippophae Rhamnoides Water
Flavoring agent, Masking
Limited public safety data.Read moreShow less
EWG N/A Flavoring agentMaskingPerfumingSkin conditioning
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
Betaine
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Hair conditioningHumectantAntistatic agentSkin conditioningViscosity controlling
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Hydroxyethylcellulose
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingFilm formingViscosity increasing agentBindingStabilisingViscosity controlling
Polyglyceryl-10 Myristate
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioningEmulsifyingSurfactant
Polyglyceryl-10 Laurate
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioningEmulsifyingSurfactant
Adenosine
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Ascorbyl Glucoside
Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 Antioxidant
Citrus Aurantium Bergamia Fruit Oil
Fragrance, Perfuming
Limited public safety data.Read moreShow less
EWG N/A FragrancePerfuming
Betaine Salicylate
Antimicrobial agent, Exfoliant
Low-hazard ingredient.Read moreShow less
EWG 1 Antimicrobial agentExfoliantKeratolytic
+ 3 more — see the full ingredients list above
Butylene Glycol
Fragrance, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSkin conditioningSolventViscositydecreasing agentHumectantMaskingViscosity controlling Good for Dry Skin
Glycolic Acid
Exfoliant, Ph adjuster
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B ExfoliantPh adjusterBuffering agent Good for Oily SkinBad 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
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
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
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 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.

Use with caution
BHA (salicylic) (Betaine Salicylate)

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.

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.

Ascorbyl Glucoside

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.

Betaine Salicylate

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.

Glycolic 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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