COSRX

Advanced The Vitamin C 23 Serum 20ml

Name: COSRX Advanced The Vitamin C 23 Serum 20ml
Brand: COSRX

20ml

Quick Summary

Best forNot stated by the brand

Worth notingNo fragrance listed

Key ingredientsVitamin C (Ascorbic Acid), Panthenol (Pro-Vitamin B5), Squalane

OverallAdvanced The Vitamin C 23 Serum is a serum from COSRX built around vitamin C (brightening), panthenol (soothing) and squalane (nourishing). No fragrance is listed in its ingredients.

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Ingredient Analysis

27 of 30 ingredients identifiedNo fragrance listed

Key ingredients

Vitamin C (Ascorbic Acid)Panthenol (Pro-Vitamin B5)Squalane

Full ingredient list (30) — tap a highlighted ingredient to learn more

Aqua/Water Solvent & base Generally gentle
Ascorbic Acid Antioxidant & brightening Generally gentle
Butylene Glycol Humectant & solvent Generally gentle
Dimethicone Silicone emollient & smoother Generally gentle
Panthenol Soothing humectant Generally gentle
3-O-Ethyl Ascorbic Acid Antioxidant & brightening Generally gentle
Squalane Lightweight emollient Generally gentle
Sodium Hydroxide pH adjuster All skin types
Caffeine Antioxidant & de-puffing Generally gentle
Sodium Hyaluronate Hydration & moisture retention Generally gentle

Show the other 20 ingredients

Sodium Metaphosphate
Adenosine Smoothing & anti-wrinkle Generally gentle
Acetyl Glucosamine Brightening & hydrating amino sugar Generally gentle
Gardenia Florida Fruit Extract Plant extracts Generally gentle
Allantoin Soothing & skin-conditioning Generally gentle
Dextrin Emollient & skin softener Generally gentle
Tocotrienols Antioxidant & conditioning Generally gentle
Tocopherol Antioxidant & conditioning Generally gentle
Elaeis Guineensis (Palm) Oil Rich plant emollients Generally gentle
Arginine Hydration & barrier support Generally gentle
Niacinamide Barrier support & even tone Generally gentle
Pentylene Glycol Humectant & solvent All skin types
Glutathione
Helianthus Annuus (Sunflower) Seed Oil Emollient plant oil Generally gentle
Methyl Trimethicone Silicone emollient & smoother Generally gentle
Carthamus Tinctorius (Safflower) Seed Oil Rich plant emollients Generally gentle
Camellia Japonica Seed Oil Rich plant emollients Generally gentle
Daucus Carota Sativa (Carrot) Root Extract Plant extracts Generally gentle
Glycyrrhiza Glabra (Licorice) Root Extract Soothing & brightening botanical Generally gentle
Beta-Carotene

Ingredients from the Boots.com listing, checked 19 Oct 2026, in INCI order. Brands reformulate, so check the pack if you react to an ingredient. Highlighted ingredients link to our guide. Informational only — not medical advice.

Common questions

Is COSRX Advanced The Vitamin C 23 Serum fragrance-free?

Yes. No fragrance, essential oils or fragrance allergens are listed in its ingredients.

Does COSRX Advanced The Vitamin C 23 Serum contain alcohol?

No drying alcohol (alcohol denat. or ethanol) is listed.

Is COSRX Advanced The Vitamin C 23 Serum safe for fungal acne?

It contains 4 ingredients that fungal-acne (Malassezia) guides usually avoid: plant oils & butters (elaeis guineensis (palm) oil, helianthus annuus (sunflower) seed oil, carthamus tinctorius (safflower) seed oil, camellia japonica seed oil). How much they matter depends on the amount and the rest of the formula. The evidence comes mainly from lab studies of yeast growth, and fungal acne needs a diagnosis from a GP or dermatologist.

Is COSRX Advanced The Vitamin C 23 Serum suitable for sensitive skin?

Its ingredient list avoids the most common irritants: no fragrance, essential oils, drying alcohol or strong exfoliating acids are listed. Reactions are individual, so patch-test anything new.