Advanced The Vitamin C 23 Serum

Image: cosrx.com

COSRX

Advanced The Vitamin C 23 Serum

A serum built around Vitamin C and Vitamin C, for barrier repair and hydration.

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Brand price

USD 25.00 · 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

  • Dark spots & pigmentation
  • Fine lines & wrinkles
  • Dullness

How to use

After cleansing and toning, apply 2–3 drops to the entire face. Pat gently for better absorption. Follow with moisturizer and SPF during the day.

Caution

As this product contains a high concentration of Vitamin C, we recommend avoiding use alongside Copper Peptide products, including our Blue Peptide Serum & Cream, as well as other high-concentration actives such as retinol. For best results, use them at different times of day (morning/evening) to optimize absorption and maximize the benefits of each product.

What's inside

Ingredients List

8 trigger at least one check · 22 trigger none

clear
AquaSolvent
0 / —
clear
Ascorbic AcidAntioxidant
—
  • Vitamin C
  • Vitamin C (L-ascorbic acid)
  • Anti-Aging
  • Anti-Pollution
  • Antioxidant
  • Brightening
  • Dark Spots
  • Even Tone
clear
1 / 0
  • Hydrating
flagged
DimethiconeEmollient
1 / 0
  • Silicones
  • Barrier Repair
  • Hydrating
  • Smoothing
clear
PanthenolSkin Conditioning
0 / 0
  • Panthenol (provitamin B5)
  • Barrier Repair
  • Hydrating
  • Reduces Irritation
clear
3-O-Ethyl Ascorbic AcidSkin Conditioning
—
  • Vitamin C
  • Vitamin C derivative (stable)
  • Antioxidant
  • Brightening
  • Dark Spots
clear
SqualaneEmollient
1 / 0
  • Face oil
  • Barrier Repair
  • Hydrating
  • May Worsen Oily Skin
clear
0 / —
clear
CaffeineSkin Conditioning
—
  • Under-Eye Care
clear
0 / 0
  • Hyaluronic acid
  • Hydrating

Key Ingredients

  • Face oil1

    An oil formulated to be used on the face.

    Squalane

  • Vitamin E1

    Tocopherols — fat-soluble antioxidants.

    Tocopherol

  • Vitamin C (L-ascorbic acid)1

    L-ascorbic acid, the unesterified form of vitamin C.

    Ascorbic Acid

  • Vitamin C derivative (stable)1

    Stable derivatives of ascorbic acid.

    3-O-Ethyl Ascorbic Acid

  • Panthenol (provitamin B5)1

    Provitamin B5 — a humectant and soother.

    Panthenol

  • Hyaluronic acid1

    Hyaluronic acid and its salts; a humectant that binds water to the skin.

    Sodium Hyaluronate

  • Niacinamide1

    Vitamin B3 — supports the barrier and evens tone.

    Niacinamide

  • Vitamin C2

    Vitamin C in any form: an antioxidant and brightener.

    3-O-Ethyl Ascorbic Acid, Ascorbic Acid

Benefits

Concerns

Ingredients Explained

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Dupes

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