The Vitamin C 13 Serum
No.5+ Glutathione Vitamin Concentrated Serum

COSRX

The Vitamin C 13 Serum

Numbuzin

No.5+ Glutathione Vitamin Concentrated Serum

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

A serum built around Niacinamide and Panthenol, for hydration and barrier repair.

Serum
Serum
25 ingredients
47 ingredients

Brand price

USD 21.00 · checked 25 Sept 2026 · brand's site

Brand price

USD 26.00 · checked 26 Sept 2026 · brand's site

No retailer listed yet
No retailer listed yet
Brand from South Korea
Brand from South Korea

At a Glance

Every check both products could be assessed on comes out the same. Tap any answer to see why.

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

Benefits

Concerns

Ingredients Side-by-side

Show highlights for:

  • Water (in both products)

    Skin Conditioning

  • Ascorbic Acid (in both products)

    Antioxidant

    • Vitamin C
    • Vitamin C (L-ascorbic acid)
    • Anti-Aging
    • Anti-Pollution
    • Antioxidant
    • Brightening
    • Dark Spots
    • Even Tone

  • Butylene Glycol (in both products)

    Humectant

    1 / 0

    • Hydrating

  • Dipropylene Glycol

    Perfuming

    0-1 / —

  • Tromethamine (in both products)

    Buffering

    0 / —

  • 3-O-Ethyl Ascorbic Acid (in both products)

    Skin Conditioning

    • Vitamin C
    • Vitamin C derivative (stable)
    • Antioxidant
    • Brightening
    • Dark Spots

  • Panthenol (in both products)

    Skin Conditioning

    0 / 0

    • Panthenol (provitamin B5)
    • Barrier Repair
    • Hydrating
    • Reduces Irritation

  • Acetyl Glucosamine

    Skin Conditioning

    • Fatty alcohols (Malassezia)
    • Dark Spots
    • Hydrating
    • May Worsen Seborrheic Dermatitis

  • Caffeine

    Skin Conditioning

    • Under-Eye Care

  • Sodium Hyaluronate (in both products)

    Humectant

    0 / 0

    • Hyaluronic acid
    • Hydrating

Ingredients Explained

These ingredients are found in both products.

Ingredients higher up in an ingredient list are typically present in a larger amount.

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