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La Roche-Posay
Vitamin C12 Serum
A serum built around Vitamin C and Vitamin C, for barrier repair and hydration.
Brand price
USD 44.99 · checked 25 Sept 2026 · on the brand's site
From the brand
What the brand says about this product. Our ingredient analysis follows below.
The brand recommends it for
- Dry skin
- Oily skin
- Combination skin
- Normal skin
- Sensitive skin
- Dark spots & pigmentation
- Fine lines & wrinkles
- Dryness & dehydration
- Uneven texture
How to use
3-4 Drops WHEN MORNING After cleansing face WHERE ON FACE & NECK Taking care to avoid eye area APPLICATION TIP Gently massage the serum with your finger tips. Follow with a daily moisturizer and SPF.
Caution
Pure vitamin C can react on contact with the air, causing it to turn yellow. But it's still effective.
What's inside
Ingredients List
10 trigger at least one check · 19 trigger none
- Vitamin C
- Vitamin C (L-ascorbic acid)
- Anti-Aging
- Anti-Pollution
- Antioxidant
- Brightening
- Dark Spots
- Even Tone
- Denatured alcohol
- May Worsen Dryness
- May Worsen Eczema
- May Worsen Irritation
- May Worsen Rosacea
Key Ingredients
Hyaluronic acid1
Hyaluronic acid and its salts; a humectant that binds water to the skin.
Benefits
Hydrating6
Boosts hydration and relieves dry, tight skin.
Dimethicone, Glycerin, Hydrolyzed Hyaluronic Acid, Propylene Glycol, Sodium Hyaluronate, Tocopherol
Barrier Repair8
Strengthens and restores the skin's natural barrier.
C13-14 Isoparaffin, Caprylyl Glycol, Cyclohexasiloxane, Dimethicone, Glycerin, Pentaerythrityl Tetraethylhexanoate, Propylene Glycol, Tocopherol
Smoothing6
Refines rough or uneven texture.
C13-14 Isoparaffin, Caprylyl Glycol, Cyclohexasiloxane, Dimethicone, Pentaerythrityl Tetraethylhexanoate, Salicylic Acid
Anti-Pollution5
Helps defend against airborne pollutants.
Concerns
May Worsen Seborrheic Dermatitis3
May feed the yeast involved in seborrheic dermatitis.
Acetyl Dipeptide-1 Cetyl Ester, Laureth-7, PEG-20 Methyl Glucose Sesquistearate
Ingredients Explained
Click on any ingredient to learn more about it
Aqua
Solvent
Ascorbic Acid
Antioxidant, Buffering, Fragrance, Skin Conditioning
Ascorbic Acid is L-ascorbic acid.
Learn more about Ascorbic Acid →Cyclohexasiloxane
Hair Conditioning, Emollient, Solvent
Cyclohexasiloxane is a silicone.
Learn more about Cyclohexasiloxane →Glycerin
Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care, Perfuming, Humectant, Skin Protecting, Solvent, Viscosity Controlling
Glycerin may be plant, synthetic or animal depending on the supplier.
Learn more about Glycerin →Alcohol Denat.
Antifoaming, Antimicrobial, Astringent, Fragrance, Solvent, Viscosity Controlling
Alcohol Denat. is a drying alcohol.
Learn more about Alcohol Denat. →Potassium Hydroxide
Buffering
Potassium Hydroxide is the inorganic base
Learn more about Potassium Hydroxide →Polymethylsilsesquioxane
Opacifying
Polymethylsilsesquioxane is a silicone.
Learn more about Polymethylsilsesquioxane →Polysilicone-11
Film Forming
Polysilicone-11 is a silicone.
Learn more about Polysilicone-11 →Dimethicone
Antifoaming, Skin Conditioning, Emollient, Skin Protecting
Dimethicone is a silicone.
Learn more about Dimethicone →Propylene Glycol
Fragrance, Humectant, Humectant, Skin Conditioning, Solvent, Viscosity Controlling
Propylene Glycol is the aliphatic alcohol that conforms generally to the formula
Learn more about Propylene Glycol →
Dupes
- La Roche-Posay Retinol B3 Pure Retinol Serum72% match
- La Roche-Posay Vitamin C12 Oil Control Serum For Oily Skin67% match
- SkinCeuticals Hyaluronic Acid Intensifier Multi-Glycan66% match
- La Roche-Posay Mela B3 Dark Spot Serum With Melasyl™ + Niacinamide65% match
- La Roche-Posay Hyalu B5 Suractivated Serum with Hyaluronic Acid63% match
- La Roche-Posay Mela B3 Double Dose Discoloration Treatment with Melasyl™62% match