Ultra Pure High-Potency 5.0% Niacinamide Serum

Kiehl's

Ultra Pure High-Potency 5.0% Niacinamide Serum

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About this product

The Kiehl's Ultra Pure High-Potency 5.0% Niacinamide Serum is a serums, essence, ampoule. Our analysis of its 10 ingredients (10 low-risk) rates it Excellent (100/100). Based on its ingredients, it looks well-suited to 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
10
Low-risk
10
Fragrance
Fragrance-free
Origin
United States

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
Methyl Gluceth-20 Caprylyl Glycol Sodium Hyaluronate Glycerin
Caution for dry skin
Glycerin Sodium Hydroxide
Oily/Acne-Prone Skin No data
Sensitive Skin 2/1
Good for sensitive skin
Glycerin Hydroxyacetophenone
Caution for sensitive skin
Glycerin

Ingredients list

10 total
Lower hazard (1) Higher hazard (3)
All10 Skin Conditioning5 Humectant5 Solvent3 Hair Conditioning3 Emulsion Stabilising2 Viscosity Controlling2 Viscosity Decreasing Agent2 Denaturant2
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
A
Niacinamide
(Hair Conditioning, Skin Conditioning, Smoothing)
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
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
A
Methyl Gluceth-20
(Humectant, Moisturising)
1
Hydroxyacetophenone
(Antioxidant)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
1
A
Carbomer
(Emulsion Stabilising, Viscosity Increasing Agent, Gel Forming, Viscosity Controlling)
3
B
Sodium Hydroxide
(Denaturant, Ph Adjuster, Buffering Agent)

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

Niacinamide
Strengthens, smooths, and brightens skin.
Hyaluronic Acid
Hydrates by attracting and holding water.
Antioxidants
Shields skin from free radical damage.

Benefits

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

Concerns

Not fungal acne (malassezia) safe

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Niacinamide
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningSmoothing
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Methyl Gluceth-20
Humectant, Moisturising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A HumectantMoisturising
Hydroxyacetophenone
Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 Antioxidant
Caprylyl Glycol
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningEmollientHumectant
Carbomer
Emulsion stabilising, Viscosity increasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emulsion stabilisingViscosity increasing agentGel formingViscosity controlling
Sodium Hydroxide
Denaturant, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B DenaturantPh adjusterBuffering agent
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 Morning & evening: Suitable for both AM and PM use.

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.

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

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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