Vitamin C12 Serum

La Roche-Posay

Where to buy Possibly in stock

About this product

The La Roche-Posay Vitamin C12 Serum is a serums, essence, ampoule. Our analysis of its 30 ingredients (24 low-risk) rates it Excellent (96/100). 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
30
Low-risk
24
Fragrance
Contains fragrance
Origin
France

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 10/9
Good for dry skin
C13-14 Isoparaffin Caprylic/Capric Triglyceride Caprylyl Glycol Sodium Hyaluronate Glycerin Pentaerythrityl Tetraethylhexanoate Hydrolyzed Hyaluronic Acid Dimethicone Bis-PEG/PPG-16/16 PEG/PPG-16/16 Dimethicone PEG-20 Methyl Glucose Sesquistearate
Caution for dry skin
Xanthan Gum Glycerin Salicylic Acid Poloxamer 338 Laureth-7 Bis-PEG/PPG-16/16 PEG/PPG-16/16 Dimethicone PEG-20 Methyl Glucose Sesquistearate Alcohol Denat. Silica
Oily/Acne-Prone Skin 2/1
Good for oily/acne-prone skin
Salicylic Acid Alcohol Denat.
Caution for oily/acne-prone skin
Pentaerythrityl Tetraethylhexanoate
Sensitive Skin 3/5
Good for sensitive skin
Glycerin Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate Dimethicone
Caution for sensitive skin
Caprylic/Capric Triglyceride Glycerin Salicylic Acid Citric Acid Alcohol Denat.

Ingredients list

30 total
Lower hazard (1) Higher hazard (4)
All30 Skin Conditioning19 Emollient7 Solvent6 Fragrance6 Viscosity Controlling5 Hair Conditioning5 Humectant5 Emulsion Stabilising4
EWG CIR Ingredient Name & Cosmetic Functions Notes
1
Water
(Solvent)
ASCORBIC ACID
(Antioxidant, Buffering, Fragrance, Skin Conditioning)
3
A
Dimethicone
(Antifoaming Agent, Skin Protecting, Emollient, Skin Conditioning)
Silicone
Silicone
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
Alcohol Denat.
(Antifoaming Agent, Antimicrobial, Astringent, Masking, Solvent, Viscosity Controlling)
Bad for Dry Skin
Bad for Dry Skin
Bad for Sensitive Skin
Bad for Sensitive Skin
3
B
Potassium Hydroxide
(Ph Adjuster, Buffering Agent)
1
Polysilicone-11
(Film Forming)
1
2
A
Silica
(Abrasive, Absorbent, Anticaking Agent, Bulking Agent, Opacifying, Viscosity Controlling)
1
A
Pentaerythrityl Tetraethylhexanoate
(Binding Agent, Skin Conditioning Agent Occlusive, Viscosity Increasing Agent, Emollient, Viscosity Controlling)
3
A
PEG-20 Methyl Glucose Sesquistearate
(Skin Conditioning, Emollient, Emulsifying, Surfactant)
1
A
Sodium Hyaluronate
(Skin Conditioning, Humectant)
Good for Dry Skin
Good for Dry Skin
1
Adenosine
(Skin Conditioning)
2
A
Poloxamer 338
(Emulsifying, Surfactant)
1
Ammonium Polyacryloyldimethyl Taurate
(Emulsion Stabilising, Viscosity Increasing Agent, Viscosity Controlling)
1
Hydrolyzed Hyaluronic Acid
(Hair Conditioning, Humectant, Skin Conditioning)
1
A
Caprylic/Capric Triglyceride
(Emollient, Masking, Perfuming, Skin Conditioning, Solvent)
1
A
Caprylyl Glycol
(Hair Conditioning, Skin Conditioning, Emollient, Humectant)
2
A
Citric Acid
(Chelating Agent, Fragrance, Ph Adjuster, Buffering Agent, Masking)
Bad for Sensitive Skin
Bad for Sensitive Skin
3
B
Laureth-7
(Emulsifying, Surfactant)
1
Trisodium Ethylenediamine Disuccinate
(Chelating Agent)
3
A
Bis-PEG/PPG-16/16 PEG/PPG-16/16 Dimethicone
(Emollient, Emulsifying, Skin Conditioning, Surfactant)
1
Acetyl Dipeptide-1 Cetyl Ester
(Hair Conditioning, Skin Conditioning)
1
A
Xanthan Gum
(Binding Agent, Emulsion Stabilising, Skin Conditioning, Surfactant Emulsifying Agent, Viscosity Increasing Agent, Binding, Gel Forming, Viscosity Controlling)
1
A
Pentylene Glycol
(Skin Conditioning, Solvent)
4
B
Polyacrylamide
(Binding Agent, Film Forming, Hair Fixing, Antistatic Agent, Binding)
1
B
C13-14 Isoparaffin
(Emollient, Solvent)
TOCOPHEROL
(Antioxidant, Fragrance, Skin Conditioning)
1
A
Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate
(Antioxidant)
4
B
Salicylic Acid
(Antiacne Agent, Antidandruff Agent, Corn/Callus/Wart Remover, Denaturant, Exfoliant, Fragrance, Hair Conditioning, Skin Conditioning, Keratolytic, Masking, Preservative)
Good for Oily Skin
Good for Oily Skin
Bad for Sensitive Skin
Bad for Sensitive Skin
PARFUM
(Fragrance, Perfuming)

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.
Hyaluronic Acid
Hydrates by attracting and holding water.
BHA
Unclogs pores and reduces excess oil.
Vitamin C
Brightens, evens tone, and supports collagen.
Vitamin E
Protects skin and soothes irritation.
Peptides
Supports skin hydration and improves firmness.
Exfoliators
Removes dead skin cells to smoothe texture.
Show all 7 key ingredients

Benefits

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

Concerns

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

Ingredients explained

Water
Solvent
Low-hazard ingredient.Read moreShow less
EWG 1 Solvent
ASCORBIC ACID
Antioxidant, Buffering
Limited public safety data.Read moreShow less
EWG N/A AntioxidantBufferingFragranceSkin conditioning
Potassium Hydroxide
Ph adjuster, Buffering agent
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B Ph adjusterBuffering agent
Polysilicone-11
Film forming
Low-hazard ingredient.Read moreShow less
EWG 1 Film forming
Silica
Abrasive, Absorbent
Low-hazard ingredient.Read moreShow less
EWG 1–2 CIR A AbrasiveAbsorbentAnticaking agentBulking agentOpacifyingViscosity controlling
Pentaerythrityl Tetraethylhexanoate
Binding agent, Skin-conditioning agent - occlusive
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Binding agentSkin-conditioning agent - occlusiveViscosity increasing agentEmollientViscosity controlling
PEG-20 Methyl Glucose Sesquistearate
Skin conditioning, Emollient
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Skin conditioningEmollientEmulsifyingSurfactant
Adenosine
Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 Skin conditioning
Poloxamer 338
Emulsifying, Surfactant
Low-hazard ingredient.Read moreShow less
EWG 2 CIR A EmulsifyingSurfactant
Ammonium Polyacryloyldimethyl Taurate
Emulsion stabilising, Viscosity increasing agent
Low-hazard ingredient.Read moreShow less
EWG 1 Emulsion stabilisingViscosity increasing agentViscosity controlling
Hydrolyzed Hyaluronic Acid
Hair conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 Hair conditioningHumectantSkin conditioning
Caprylic/Capric Triglyceride
Emollient, Masking
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A EmollientMaskingPerfumingSkin conditioningSolvent
Caprylyl Glycol
Hair conditioning, Skin conditioning
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Hair conditioningSkin conditioningEmollientHumectant
Laureth-7
Emulsifying, Surfactant
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR B EmulsifyingSurfactant
Trisodium Ethylenediamine Disuccinate
Chelating agent
Low-hazard ingredient.Read moreShow less
EWG 1 Chelating agent
+ 9 more — see the full ingredients list above
Dimethicone
Antifoaming agent, Skin protecting
Low-to-moderate hazard.Read moreShow less
EWG 3 CIR A Antifoaming agentSkin protectingEmollientSkin conditioning Silicone
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
Alcohol Denat.
Antifoaming agent, Antimicrobial
Causes moisture evaporation - prone to dry out skinRead moreShow less
EWG 4 Antifoaming agentAntimicrobialAstringentMaskingSolventViscosity controlling Bad for Dry SkinBad for Sensitive Skin
Sodium Hyaluronate
Skin conditioning, Humectant
Low-hazard ingredient.Read moreShow less
EWG 1 CIR A Skin conditioningHumectant Good for Dry 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
Salicylic Acid
Antiacne agent, Antidandruff agent
Skin irritation can occur at high concentrationRead moreShow less
EWG 4 CIR B Antiacne agentAntidandruff agentCorn/callus/wart removerDenaturantExfoliantFragranceHair conditioningSkin conditioningKeratolyticMaskingPreservative Good for Oily SkinBad for Sensitive 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) (Salicylic Acid)

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.

ASCORBIC ACID

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.

Salicylic 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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