C3 Glow Serum

Byko

Where to buy Possibly in stock

About this product

The Byko C3 Glow Serum is a serums, essence, ampoule. Our analysis of its 27 ingredients (19 low-risk) rates it Excellent (88/100). Based on its ingredients, it looks well-suited to 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
27
Low-risk
19
Fragrance
Contains fragrance
Origin
Sweden
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 8/4
Good for dry skin
Glyceryl Stearate Citrate Glyceryl Caprylate Cetearyl Alcohol Argania Spinosa Kernel Oil Phyllanthus Emblica Fruit Extract Sodium Hyaluronate Glycerin Lactic Acid
Caution for dry skin
Glyceryl Caprylate Lysolecithin Xanthan Gum Glycerin
Oily/Acne-Prone Skin No data
Sensitive Skin 3/9
Good for sensitive skin
Ascorbyl Glucoside Glycerin Aloe Barbadensis Leaf Juice
Caution for sensitive skin
Glycerin Citric Acid Sodium Benzoate Potassium Sorbate Lactic Acid Linalool Limonene Citral Geraniol

Ingredients list

27 total
Lower hazard (1) Higher hazard (7)
All27 Skin Conditioning17 Fragrance9 Emulsion Stabilising6 Masking5 Humectant5 Emulsifying4 Emollient4 Viscosity Controlling3
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
B
Aloe Barbadensis Leaf Juice
(Skin Conditioning)
Good for Sensitive Skin
Good for Sensitive 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
Argania Spinosa Kernel Oil
(Emollient, Skin Conditioning)
Fungal Acne
Fungal Acne Trigger
1
Ascorbyl Glucoside
(Antioxidant)
Shea Butter Ethyl Esters
(Skin Conditioning, Skin Conditioning Emollient)
1
B
Glyceryl Stearate Citrate
(Skin Conditioning, Emollient, Emulsifying)
Fungal Acne
Fungal Acne Trigger
1
A
Cetearyl Alcohol
(Emulsion Stabilising, Opacifying, Foam Boosting, Viscosity Increasingagent Aqueous, Viscosity Increasing Agent, Emollient, Emulsifying, Viscosity Controlling)
1
Lactobacillus/Lemon Peel Ferment Extract
(Hair Conditioning, Skin Conditioning)
1
Calcium Ketogluconate
(Skin Conditioning)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
Phyllanthus Emblica Fruit Extract
(Humectant, Skin Conditioning)
1
Leuconostoc/Radish Root Ferment Filtrate
(Antidandruff Agent, Antimicrobial)
1
A
Lysolecithin
(Emulsifying, Surfactant)
1
A
Sclerotium Gum
(Emulsion Stabilising, Skin Conditioning, Viscosity Increasing Agent, Viscosity Controlling)
1
A
Pullulan
(Binding Agent, Film Forming, Binding)
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
Glyceryl Caprylate
(Skin Conditioning, Emollient, Emulsifying, Surfactant)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
3
A
Sodium Benzoate
(Fragrance, Preservative, Anticorrosive, Masking)
3
A
Potassium Sorbate
(Fragrance, Preservative)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
PARFUM
(Fragrance, Perfuming)
7
Citral
(Flavoring Agent, Fragrance, Masking)
Allergens
Allergens
6
Limonene
(Deodorant, Perfuming, Solvent)
Allergens
Allergens
7
Geraniol
(Fragrance, Masking, Tonic)
Allergens
Allergens
5
Linalool
(Fragrance, Deodorant, Masking)
Allergens
Allergens

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.
Barrier RepairStrengthen and restore your skin's natural barrier.
Reduces IrritationEases discomfort and supports skin resilience.
Redness ReducingSoothes visible redness and calms irritation.
Scar HealingImproves the look of marks and scars.
Anti-AgingSoftens lines and helps skin look youthful.
BrighteningRestores radiance to dull, tired skin.
Good For Oily SkinBalances oil and helps reduce shine.

Concerns

Contains eu allergen
Not fungal acne (malassezia) safe
Citral — higher EWG
Geraniol — higher EWG
May not suit sensitive skin

EWG flags hazard, not real-world risk — ratings don't account for how much of an ingredient a product contains. Treat these as things to research, not verdicts. How we score →

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
Ascorbyl Glucoside
Antioxidant
Low-hazard ingredient.Read moreShow less
EWG 1 Antioxidant
Shea Butter Ethyl Esters
Skin conditioning, Skin conditioning - emollient
Limited public safety data.Read moreShow less
EWG N/A Skin conditioningSkin conditioning - emollient
Cetearyl Alcohol
Emulsion stabilising, Opacifying
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emulsion stabilisingOpacifyingFoam boostingViscosity increasingagent - aqueousViscosity increasing agentEmollientEmulsifyingViscosity controlling
Lactobacillus/Lemon Peel Ferment Extract
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningSkin conditioning
Calcium Ketogluconate
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Phyllanthus Emblica Fruit Extract
Humectant, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 HumectantSkin conditioning
Leuconostoc/Radish Root Ferment Filtrate
Antidandruff agent, Antimicrobial
Low-hazard ingredient.Read moreShow less
EWG 1 Antidandruff agentAntimicrobial
Lysolecithin
Emulsifying, Surfactant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmulsifyingSurfactant
Sclerotium Gum
Emulsion stabilising, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Emulsion stabilisingSkin conditioningViscosity increasing agentViscosity controlling
Pullulan
Binding agent, Film forming
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentFilm formingBinding
Glyceryl Caprylate
Skin conditioning, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningEmollientEmulsifyingSurfactant
Xanthan Gum
Binding agent, Emulsion stabilising
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentEmulsion stabilisingSkin conditioningSurfactant -emulsifying agentViscosity increasing agentBindingGel formingViscosity controlling
Sodium Benzoate
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A FragrancePreservativeAnticorrosiveMasking
Potassium Sorbate
Fragrance, Preservative
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A FragrancePreservative
+ 1 more — see the full ingredients list above
Aloe Barbadensis Leaf Juice
Skin conditioning
Limited public safety data.Read moreShow less
EWG N/A CIR B Skin conditioning Good 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
Argania Spinosa Kernel Oil
Emollient, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientSkin conditioning Fungal-acne trigger
Glyceryl Stearate Citrate
Skin conditioning, Emollient
Low-hazard ingredient.Read moreShow less
EWG 1 CIR B Skin conditioningEmollientEmulsifying Fungal-acne trigger
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry 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
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
Citral
Flavoring agent, Fragrance
Higher-hazard ingredient.Read moreShow less
EWG 7 Flavoring agentFragranceMasking Allergens
Limonene
Deodorant, Perfuming
Moderate-hazard ingredient.Read moreShow less
EWG 6 DeodorantPerfumingSolvent Allergens
Geraniol
Fragrance, Masking
Higher-hazard ingredient.Read moreShow less
EWG 7 FragranceMaskingTonic 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

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

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.

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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