The Niacinamide 15 Serum
Dual Effect Ampoule

COSRX

The Niacinamide 15 Serum

Rejuran

Dual Effect Ampoule

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

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

Serum
Serum
15 ingredients
40 ingredients

Brand price

USD 25.00 · checked 25 Sept 2026 · brand's site

Brand price

USD 55.00 · checked 28 Sept 2026 · brand's site

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

At a Glance

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Key Ingredients

  • Vitamin E1

    Tocopherols — fat-soluble antioxidants.

    Tocopherol

  • Zinc salt (sebum/soothing)1

    Zinc salts, used for sebum control and soothing.

    Zinc PCA

  • AHA1

    Alpha hydroxy acids — water-soluble chemical exfoliants.

    Citric Acid

  • Niacinamide1

    Vitamin B3 — supports the barrier and evens tone.

    Niacinamide

  • Ceramide1

    Skin-identical lipids that hold the barrier together.

    Ceramide NP

  • Face oil1

    An oil formulated to be used on the face.

    Squalane

  • Vitamin E1

    Tocopherols — fat-soluble antioxidants.

    Tocopheryl Acetate

  • Alpha arbutin1

    A gentler glycosylated relative of hydroquinone.

    Arbutin

Benefits

Concerns

  • May Trigger Acne1

    Can clog pores or trigger breakouts.

    Tocopherol

  • May Worsen Seborrheic Dermatitis1

    May feed the yeast involved in seborrheic dermatitis.

    Acetyl Glucosamine

  • May Worsen Keratosis Pilaris1

    May clog follicles or strip skin prone to keratosis pilaris.

    Tocopherol

  • May Worsen Irritation1

    May cause stinging, redness or sensitivity.

    Tocopherol

Ingredients Side-by-side

Show highlights for:

  • Water (in both products)

    Skin Conditioning

  • Pentylene Glycol (in both products)

    Skin Conditioning

    0-1 / —

  • Niacinamide (in both products)

    Smoothing

    0 / —

    • Niacinamide
    • Acne Fighting
    • Barrier Repair
    • Brightening
    • Dark Spots
    • Even Tone
    • Oil Control
    • Pore Refining
    • Redness Reducing

  • Butylene Glycol (in both products)

    Humectant

    1 / 0

    • Hydrating

  • Acetyl Glucosamine

    Skin Conditioning

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

  • 1,2-Hexanediol (in both products)

    Skin Conditioning

  • Zinc PCA

    Humectant

    • Zinc salt (sebum/soothing)
    • Acne Fighting
    • Oil Control
    • Reduces Irritation

  • Trehalose (in both products)

    Humectant

    0-1 / —

    • Hydrating

  • Xanthan Gum (in both products)

    Cleansing

    0-1 / —

  • Pullulan (in both products)

    Film Forming

    0-1 / —

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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