The Niacinamide 15 Serum
1% Retinol Booster

COSRX

The Niacinamide 15 Serum

Paula's Choice

1% Retinol Booster

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

A serum built around Retinoid and Ceramide, for barrier repair and hydration.

Serum
Serum
15 ingredients
27 ingredients

Brand price

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

Brand price

USD 55.00 · checked 8 Oct 2026 · brand's site

No retailer listed yet
No retailer listed yet
Brand from South Korea
Brand country not recorded

At a Glance

They come out differently on Pore-clogger-free, Oil-free and Vegan; those rows are shaded. Tap any answer to see why.

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

  • Colloidal oatmeal1

    Finely milled oat — an FDA-recognised skin protectant.

    Avena Sativa Kernel Extract

  • Polysorbates (Tween emulsifiers)1

    Polysorbate (Tween) emulsifiers.

    Polysorbate 20

  • Retinoid1

    Vitamin A derivatives that speed cell turnover.

    Retinol

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

    Skin Conditioning

    0-1 / —

  • Niacinamide

    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

    Skin Conditioning

  • Zinc PCA

    Humectant

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

  • Trehalose

    Humectant

    0-1 / —

    • Hydrating

  • Xanthan Gum (in both products)

    Cleansing

    0-1 / —

  • Pullulan

    Film Forming

    0-1 / —

  • Water (in both products)

    Skin Conditioning

  • Glycerin

    Humectant

    0 / 0

    • Possibly animal-derived
    • Hydrating

  • Carthamus Tinctorius Seed Oil

    Skin Conditioning

    0 / 0

    • Plant oils and butters (coconut, olive, shea)
    • Plant or mineral oil
    • Barrier Repair
    • May Worsen Oily Skin
    • May Worsen Seborrheic Dermatitis

  • Polyglyceryl-10 Caprylate/Caprate

    Cleansing

  • Butylene Glycol (in both products)

    Humectant

    1 / 0

    • Hydrating

  • Pyrus Malus Fruit Extract

    Skin Conditioning

  • Polysorbate 20

    Cleansing

    0 / 0

    • Fatty esters (glyceryl stearate, PEG-100 stearate)
    • Polysorbates (Tween emulsifiers)
    • May Worsen Seborrheic Dermatitis

  • Retinol

    Skin Conditioning

    • Retinoid
    • Acne Fighting
    • Anti-Aging
    • Dark Spots
    • Firming
    • Oil Control
    • Pore Refining
    • Smoothing

  • Glycyrrhiza Glabra

  • Ceramide NP

    Skin Conditioning

    • Ceramide
    • Fatty esters (glyceryl stearate, PEG-100 stearate)
    • Barrier Repair
    • Hydrating
    • May Worsen Seborrheic Dermatitis

Ingredients Explained

These ingredients are found in both products.

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

  • Water

    Antiplaque, Skin Conditioning, Solvent

    Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water

    Learn more about Water →

  • Butylene Glycol

    Fragrance, Humectant, Skin Conditioning, Solvent, Viscosity Controlling

    Butane-1,3-diol (CAS No. 107-88-0/ EC No. 203-529-7) (R)-(-)-butane-1,3-diol” (CAS No. 6290-03-5/ EC No. 228-532-0)

    Learn more about Butylene Glycol →

  • Xanthan Gum

    Binding, Emulsion Stabilising, Gel Forming, Skin Conditioning, Cleansing, Emulsifying, Viscosity Controlling

    Xanthan gum

    Learn more about Xanthan Gum →

  • Allantoin

    Skin Conditioning, Skin Protecting, Soothing

    Urea, (2,5-dioxo-4-imidazolidinyl)-

    Learn more about Allantoin →

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