No.4 Ceramide AHA Glazed Skin Prep Serum

Numbuzin

No.4 Ceramide AHA Glazed Skin Prep Serum

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About this product

The Numbuzin No.4 Ceramide AHA Glazed Skin Prep Serum is a serums, essence, ampoule. Our analysis of its 41 ingredients (33 low-risk) rates it Excellent (99/100). 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
41
Low-risk
33
Fragrance
Fragrance-free
Origin
South Korea

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 16/5
Good for dry skin
Gluconolactone Diphenyl Dimethicone Betaine Cetearyl Alcohol Sodium Hyaluronate Crosspolymer Caprylic/Capric Triglyceride Butylene Glycol Sodium Hyaluronate Glycerin Cholesterol Triethylhexanoin Hydroxyethyl Urea Hydrolyzed Glycosaminoglycans Hydrolyzed Hyaluronic Acid Hyaluronic Acid Urea
Caution for dry skin
Stearic Acid Glycerin Polyglyceryl-10 Laurate Hydrogenated Lecithin Sodium Hydroxide
Oily/Acne-Prone Skin No data
Sensitive Skin 1/7
Good for sensitive skin
Glycerin
Caution for sensitive skin
Gluconolactone Dipropylene Glycol Stearic Acid Caprylic/Capric Triglyceride Butylene Glycol Glycerin Triethylhexanoin

Ingredients list

41 total
Lower hazard (1) Higher hazard (4)
All41 Skin Conditioning41 Hair Conditioning15 Humectant14 Solvent11 Fragrance7 Viscosity Controlling7 Emulsion Stabilising6 Emulsifying6
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
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
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
A
Butylene Glycol
(Fragrance, Skin Conditioning, Solvent, Viscositydecreasing Agent, Humectant, Masking, Viscosity Controlling)
Good for Dry Skin
Good for Dry Skin
1
Gluconolactone
(Fragrance, Humectant, Solvent)
1
B
Betaine
(Hair Conditioning, Humectant, Antistatic Agent, Skin Conditioning, Viscosity Controlling)
1
A
Dipropylene Glycol
(Fragrance, Solvent, Viscosity Decreasing Agent, Masking, Viscosity Controlling)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
1
A
Panthenol
(Antistatic Agent, Hair Conditioning, Skin Conditioning)
Good for Dry Skin
Good for Dry Skin
1
A
Pentylene Glycol
(Skin Conditioning, Solvent)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)
Sphingomonas Ferment Extract
(Skin Conditioning)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
Hydrolyzed Hyaluronic Acid
(Hair Conditioning, Humectant, Skin Conditioning)
1
A
Hyaluronic Acid
(Skin Conditioning, Viscosity Increasing Agent, Antistatic Agent, Humectant, Moisturising)
1
Diphenyl Dimethicone
(Antifoaming Agent, Emollient, Emulsifying, Hair Conditioning, Skin Conditioning)
1
A
Triethylhexanoin
(Fragrance, Hair Conditioning, Antistatic Agent, Emollient, Masking, Refatting, Skin Conditioning, Solvent)
1
Hydroxyethyl Urea
(Hair Conditioning, Humectant, Skin Conditioning)
1
A
Hydroxyethylcellulose
(Binding Agent, Emulsion Stabilising, Film Forming, Viscosity Increasing Agent, Binding, Stabilising, Viscosity Controlling)
1
B
Polyglyceryl-10 Laurate
(Skin Conditioning, Emulsifying, Surfactant)
2
A
Hydrogenated Lecithin
(Skin Conditioning, Emulsifying, Surfactant, Suspending Agent Nonsurfactant)
1
A
Caprylic/Capric Triglyceride
(Emollient, Masking, Perfuming, Skin Conditioning, Solvent)
1
A
Ethylhexylglycerin
(Deodorant, Skin Conditioning)
1
A
1,2-Hexanediol
(Solvent)
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
3
A
Urea
(Buffering Agent, Humectant, Antistatic Agent, Skin Conditioning)
1
Adenosine
(Skin Conditioning)
1
Sodium Hyaluronate Crosspolymer
(Humectant, Skin Conditioning)
1
Hydrolyzed Glycosaminoglycans
(Hair Conditioning, Skin Conditioning, Humectant)
1
Ceramide NP
(Hair Conditioning, Skin Conditioning)
Benzyl Glycol
(Solvent)
1
A
Beta-Glucan
(Bulking Agent, Skin Conditioning)
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning)
1
A
Stearic Acid
(Fragrance, Sufactant, Emulsifying, Surfactantsurfactant Cleansing Agent Is Included As A Function For The Soap Form Of Stearic Acid., Emulsion Stabilising, Masking, Refatting)
Bad for Oily Skin
Bad for Oily Skin
Fungal Acne
Fungal Acne Trigger
Ceramide NS
(Hair Conditioning, Skin Conditioning)
1
A
Cholesterol
(Emulsion Stabilising, Skin Conditioning, Viscosity Increasing Agent, Emollient, Emulsifying, Stabilising, Viscosity Controlling)
1
Phytosphingosine
(Hair Conditioning, Skin Conditioning)
Ceramide AP
(Hair Conditioning, Skin Conditioning)
Ceramide AS
(Hair Conditioning, Skin Conditioning)
Ceramide EOP
(Hair Conditioning, Skin Conditioning)
1
A
Cetearyl Alcohol
(Emulsion Stabilising, Opacifying, Foam Boosting, Viscosity Increasingagent Aqueous, Viscosity Increasing Agent, Emollient, Emulsifying, 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

Glycerin
Humectant, Skin Protecting
Glycolic Acid
Exfoliant
Butylene Glycol
Skin Conditioning, Humectant
Gluconolactone
Humectant
Betaine
Humectant, Skin Conditioning
Niacinamide
Skin Conditioning

Benefits

Good for dry skin

Concerns

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

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Gluconolactone
Fragrance, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 FragranceHumectantSolvent
Betaine
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Hair conditioningHumectantAntistatic agentSkin conditioningViscosity controlling
Dipropylene Glycol
Fragrance, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSolventViscosity decreasing agentMaskingViscosity controlling
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Pentylene Glycol
Skin conditioning, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSolvent
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
Sphingomonas Ferment Extract
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A Skin conditioning
Hydrolyzed Hyaluronic Acid
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningHumectantSkin conditioning
Hyaluronic Acid
Skin conditioning, Viscosity increasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningViscosity increasing agentAntistatic agentHumectantMoisturising
Diphenyl Dimethicone
Antifoaming agent, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 Antifoaming agentEmollientEmulsifyingHair conditioningSkin conditioning
Triethylhexanoin
Fragrance, Hair conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceHair conditioningAntistatic agentEmollientMaskingRefattingSkin conditioningSolvent
Hydroxyethyl Urea
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningHumectantSkin conditioning
Hydroxyethylcellulose
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingFilm formingViscosity increasing agentBindingStabilisingViscosity controlling
Polyglyceryl-10 Laurate
Skin conditioning, Emulsifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioningEmulsifyingSurfactant
+ 20 more — see the full ingredients list above
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
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
Butylene Glycol
Fragrance, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A FragranceSkin conditioningSolventViscositydecreasing agentHumectantMaskingViscosity controlling 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
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry Skin
Stearic Acid
Fragrance, Sufactant
Potentially comedogenic - can block poresRead moreShow less
EWG 1 CIR A FragranceSufactantEmulsifyingSurfactantsurfactant-cleansing agent is included as a function for the soap form of stearic acid.Emulsion stabilisingMaskingRefatting Bad for Oily SkinFungal-acne trigger

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

Officially notified as a cosmetic in Malaysia (NPRA). Government registration record.

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

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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