Clarifying Probiotic Refining Serum

Kerstin Florian

Where to buy Possibly in stock

About this product

The Kerstin Florian Clarifying Probiotic Refining Serum is a serums, essence, ampoule. Our analysis of its 48 ingredients (35 low-risk) rates it Excellent (95/100). Based on its ingredients, it looks well-suited to oily / acne-prone and dry skin. Heads up: it contains fragrance, which can irritate sensitive or reactive skin.

Vegan-friendly Reef-safe

Summarised from our ingredient analysis — not brand marketing copy.

At a glance

Type
Serums, Essence, Ampoules
Ingredients
48
Low-risk
35
Fragrance
Contains fragrance
Origin
Sweden

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 7/6
Good for dry skin
Lavandula Hybrida Oil Phyllanthus Emblica Fruit Extract Butylene Glycol Glycerin Terminalia Bellerica Fruit Extract Zinc PCA Lactic Acid
Caution for dry skin
Rosa Canina Fruit Extract Xanthan Gum Glycerin Terminalia Bellerica Fruit Extract t-Butyl Alcohol Heptyl Glucoside
Oily/Acne-Prone Skin 2/0
Good for oily/acne-prone skin
Rosa Canina Fruit Extract Terminalia Bellerica Fruit Extract
Sensitive Skin 6/13
Good for sensitive skin
Ulva Lactuca Extract Superoxide Dismutase Spirulina Platensis Extract Glycerin Copper Gluconate Allantoin
Caution for sensitive skin
Sodium Citrate Butylene Glycol Glycerin t-Butyl Alcohol Citric Acid Benzoic Acid Sodium Benzoate Potassium Sorbate Lactic Acid Phenoxyethanol Linalool Limonene Mentha Arvensis Leaf Oil

Ingredients list

48 total
Lower hazard (1) Higher hazard (6)
All48 Skin Conditioning32 Fragrance13 Solvent7 Masking7 Skin Protecting6 Ph Adjuster6 Perfuming6 Humectant6
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
1
Propanediol
(Solvent, Viscosity Decreasing Agent, Viscosity Controlling)
1
Lactobacillus Ferment Lysate
(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
Pentylene Glycol
(Skin Conditioning, Solvent)
1
Rosa Canina Fruit Extract
(Astringent, Skin Conditioning, Tonic)
1
Chlorella Vulgaris Extract
(Skin Conditioning)
1
Saccharomyces/Xylinum/Black Tea Ferment
(Skin Conditioning)
1
Ulva Lactuca Extract
(Skin Conditioning, Skin Protecting)
1
Phyllanthus Emblica Fruit Extract
(Humectant, Skin Conditioning)
1
Terminalia Bellerica Fruit Extract
(Antimicrobial Agent, Cosmetic Astringent, Skin Conditioning, Emollient)
1
Terminalia Chebula Fruit Extract
(Skin Conditioning)
1
Spirulina Platensis Extract
(Skin Protecting)
Oryza sativa extract
(Abrasive, Absorbent, Bulking, Hair Conditioning, Skin Conditioning)
Leuconostoc Ferment Filtrate
(Anti Seborrheic, Antimicrobial, Hair Conditioning, Skin Conditioning)
1
Superoxide Dismutase
(Reducing, Skin Conditioning, Antioxidant)
Soybean Peroxidase
(Antioxidant, Skin Conditioning)
Heptyl Glucoside
(Surfactant)
1
A
Allantoin
(Skin Conditioning, Skin Protecting, Soothing)
Good for Oily Skin
Good for Oily Skin
Good for Sensitive Skin
Good for Sensitive Skin
2
Manganese Gluconate
(Skin Conditioning)
1
Ascophyllum Nodosum Extract
(Skin Conditioning)
3
Zinc PCA
(Skin Conditioning, Humectant)
2
Copper Gluconate
(Skin Conditioning, Skin Protecting)
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
4
B
Lactic Acid
(Exfoliant, Fragrance, Humectant, Ph Adjuster, Skin Conditioning Agent Humectant, Skin Conditioning, Buffering Agent)
Bad for Sensitive Skin
Bad for Sensitive Skin
1
A
Sodium Magnesium Silicate
(Binding Agent, Bulking Agent, Binding, Viscosity Controlling)
1
Sodium Phytate
(Chelating Agent, Oral Care Agent)
1
Polyacrylate Crosspolymer-6
(Emulsion Stabilising, Viscosity Controlling)
1
Leuconostoc/Radish Root Ferment Filtrate
(Antidandruff Agent, Antimicrobial)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
1
A
Hydroxyethylcellulose
(Binding Agent, Emulsion Stabilising, Film Forming, Viscosity Increasing Agent, Binding, Stabilising, Viscosity Controlling)
1
A
Sodium Citrate
(Ph Adjuster, Buffering Agent, Chelating, Masking)
1
A
Biotin
(Hair Conditioning, Skin Conditioning, Antiseborrhoeic)
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
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
3
B
Potassium Hydroxide
(Ph Adjuster, Buffering Agent)
2
A
t-Butyl Alcohol
(Denaturant, Fragrance, Solvent, Perfuming)
3
A
Benzoic Acid
(Fragrance, Ph Adjuster, Preservative, Bulking Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
4
A
Phenoxyethanol
(Fragrance, Preservative)
Paraben
Paraben
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
3
A
Potassium Sorbate
(Fragrance, Preservative)
PARFUM
(Fragrance, Perfuming)
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens
5
Linalool
(Fragrance, Deodorant, Masking)
Allergens
Allergens
Mentha Arvensis Leaf Oil
(Masking)
Citrus Limon Peel Oil
(Fragrance, Perfuming, Skin Conditioning)
1
Lavandula Hybrida Oil
(Emollient)
Mentha Piperita Oil
(Fragrance, Perfuming, Refreshing, Tonic)

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.
Zinc
Helps control oil and supports healing.
Exfoliators
Removes dead skin cells to smoothe texture.

Benefits

HydratingBoosts hydration and relieves dry, tight skin.
Scar HealingImproves the look of marks and scars.
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.
Dark SpotsFades dark spots for even skin tone.
Acne FightingFights acne and helps prevent breakouts.

Concerns

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

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Propanediol
Solvent, Viscosity decreasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 SolventViscosity decreasing agentViscosity controlling
Lactobacillus Ferment Lysate
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Pentylene Glycol
Skin conditioning, Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningSolvent
Rosa Canina Fruit Extract
Astringent, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 AstringentSkin conditioningTonic
Chlorella Vulgaris Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Saccharomyces/Xylinum/Black Tea Ferment
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Ulva Lactuca Extract
Skin conditioning, Skin protecting
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioningSkin protecting
Phyllanthus Emblica Fruit Extract
Humectant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 HumectantSkin conditioning
Terminalia Bellerica Fruit Extract
Antimicrobial agent, Cosmetic astringent
Low-hazard ingredient.Read moreShow less
EWG 1 Antimicrobial agentCosmetic astringentSkin conditioningEmollient
Terminalia Chebula Fruit Extract
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Spirulina Platensis Extract
Skin protecting
Low-hazard ingredient.Read moreShow less
EWG 1 Skin protecting
Oryza sativa extract
Abrasive, Absorbent
Limited public safety data.Read moreShow less
EWG N/A AbrasiveAbsorbentBulkingHair conditioningSkin conditioning
Leuconostoc Ferment Filtrate
Anti-seborrheic, Antimicrobial
Limited public safety data.Read moreShow less
EWG N/A Anti-seborrheicAntimicrobialHair conditioningSkin conditioning
Superoxide Dismutase
Reducing, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 ReducingSkin conditioningAntioxidant
+ 23 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
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
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
Lactic Acid
Exfoliant, Fragrance
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B ExfoliantFragranceHumectantPh adjusterSkin-conditioning agent -humectantSkin conditioningBuffering agent Bad 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
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
Benzoic Acid
Fragrance, Ph adjuster
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A FragrancePh adjusterPreservativeBulking agentMasking Bad for Sensitive Skin
Phenoxyethanol
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 4 CIR A FragrancePreservative Paraben
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens
Linalool
Fragrance, Deodorant
Moderate-hazard ingredient.Read moreShow less
EWG 5 FragranceDeodorantMasking Allergens

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.

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, Lactic 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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