[Cosrx] The Niacinamide 15 Serum 20ml

1. Product Overview

A concentrated 15% Niacinamide serum designed to help manage excess sebum, refine the appearance of enlarged pores and improve uneven-looking skin texture.

COSRX The Niacinamide 15 Serum combines a high concentration of Niacinamide with Zinc PCA and Acetyl Glucosamine to provide targeted care for oily, blemish-prone skin and visible pores.

The lightweight formula helps reduce the appearance of excess shine while supporting a smoother, clearer and more balanced-looking complexion.

Niacinamide works alongside Zinc PCA to address visible oiliness, while Acetyl Glucosamine complements the formula’s skin-texture and tone-evening benefits.

Trehalose and Allantoin provide additional moisturising and skin-conditioning support.

Designed for use during the serum stage of your routine, this concentrated treatment offers a focused approach to pore appearance, excess sebum and post-blemish marks.

2. Why We Chose It

At Glass Ritual, we distinguish between products that temporarily improve the appearance of pores and those that target concerns contributing to their visibility.

We selected COSRX The Niacinamide 15 Serum for its high-strength Niacinamide formulation, targeted sebum care and relevance to oily, blemish-prone skin.

Excess sebum can contribute to shine, congestion and the appearance of enlarged pores. This serum provides a concentrated approach to managing visible oiliness while supporting a more refined-looking complexion.

Its combination of 15% Niacinamide, Zinc PCA and Acetyl Glucosamine also makes it relevant for customers concerned about uneven skin tone and lingering post-blemish marks.

Unlike exfoliating acids, Niacinamide does not directly dissolve blackheads. Instead, this serum complements a pore-care routine by addressing excess oil and supporting skin appearance.

It earns its place in our Pore Care & Blackheads Collection as a targeted treatment for sebum management and visible pore refinement.

3. Benefits

• Excess-sebum care: Helps reduce the appearance of oily shine.
• Visible pore refinement: Supports a smoother, more refined-looking complexion.
• 15% Niacinamide: Provides concentrated care for oiliness and uneven skin appearance.
• Blemish-prone skin support: Suitable for customers seeking targeted care for oily, congestion-prone skin.
• Uneven skin tone: Helps improve the appearance of post-blemish discolouration.
• Smoother-looking texture: Supports a more even skin surface.
• Skin-conditioning support: Acetyl Glucosamine complements Niacinamide’s benefits.
• Hydration: Trehalose helps maintain skin moisture.
• Comfort: Allantoin contributes skin-conditioning benefits.
• Routine flexibility: Can be used in the morning or evening according to the supplier.

4. Who It’s For

Particularly suited to:

• Oily skin
• Combination skin
• Skin with visibly enlarged pores
• Skin experiencing excess shine
• Blemish-prone skin
• Skin concerned with congestion
• Uneven-looking skin texture
• Post-blemish marks
• Uneven skin tone
• Those seeking a concentrated Niacinamide treatment

For sensitive skin: This formula contains 15% Niacinamide, a relatively high concentration that may cause flushing, stinging or irritation in some individuals.

Those with reactive skin or limited experience using Niacinamide may prefer to introduce it gradually or begin with a lower-strength formula.

5. How to Use

1. Cleanse your face and apply your preferred toner.
2. During the serum stage, dispense a few drops of COSRX The Niacinamide 15 Serum.
3. Apply evenly across the face.
4. Gently massage with your fingertips, working from the centre of the face towards the edges.
5. Allow the serum to absorb.
6. Follow with moisturiser.

Morning: Apply during the serum stage and finish with SPF 30 or higher, as directed by COSRX.

Evening: Apply after cleansing and toning, followed by moisturiser.

Frequency: The supplier confirms that the serum can be used during the day as well as in the evening.

Because the formula contains 15% Niacinamide, begin with less frequent application if you are new to concentrated serums and increase according to skin tolerance.

6. Ritual Position

Step: Treat — Excess Sebum, Visible Pores & Uneven Tone

Apply after cleansing and toning, before moisturiser.

This concentrated serum focuses on visible oiliness, pore appearance and uneven skin tone.

Morning Routine

Cleanser → Toner → COSRX The Niacinamide 15 Serum → Moisturiser → SPF 30+

Evening Routine

Cleanser → Toner → COSRX The Niacinamide 15 Serum → Moisturiser

For customers using exfoliating acids or retinoids, introducing high-strength Niacinamide separately may help identify individual skin tolerance.

7. Glass Ritual Pairing

For cleansing:

Pair with ROUND LAB 1025 Dokdo Cleanser to remove daily impurities before applying targeted treatments.

For toning:

Follow with a gentle hydrating toner to prepare the skin for serum application.

For targeted pore care:

Apply COSRX The Niacinamide 15 Serum to address excess sebum and the appearance of enlarged pores.

For moisturising:

Complete the routine with a lightweight moisturiser suited to your skin type.

Glass Ritual Routine

ROUND LAB 1025 Dokdo Cleanser → Hydrating Toner → COSRX The Niacinamide 15 Serum → Moisturiser

Daytime: Finish with SPF 30 or higher.

For persistent blackheads, a suitable salicylic acid treatment may provide complementary care, introduced separately according to skin tolerance.

8. Key Ingredients

Niacinamide (15%)

A high concentration of Vitamin B3 that helps manage visible excess oil, improve uneven-looking skin tone and reduce the appearance of enlarged pores.

Niacinamide also supports the skin’s moisture-barrier function.

Zinc PCA

A skin-conditioning ingredient commonly used in formulations for oily and blemish-prone skin. It complements Niacinamide in managing the appearance of excess sebum.

Acetyl Glucosamine

A skin-conditioning ingredient that works alongside Niacinamide to support smoother-looking texture and a more even complexion.

Trehalose

A moisture-supporting ingredient that helps maintain hydration and reduce moisture loss.

Allantoin

A skin-conditioning ingredient that helps support skin comfort.

Tocopherol

A form of Vitamin E that provides antioxidant and skin-conditioning benefits.

9. Full Ingredients

Original Hypercape DS Ingredient List

Water, Pentylene Glycol, Niacinamide(15%), Butylene Glycol, Acetyl Glucosamine, 1,2-Hexanediol, Zinc PCA, Trehalose, Xanthan Gum, Pullulan, Allantoin, Ethylhexylglycerin, Sodium Phytate, Citric Acid, Tocopherol

10. Safety & Ingredient Information

• For external use only.
• Avoid direct contact with the eyes.
• Contains 15% Niacinamide, which may not suit all skin types or tolerance levels.
• High-strength Niacinamide may cause temporary flushing, warmth, stinging or irritation in some users.
• Patch test before first use.
• Introduce gradually, particularly if you are new to concentrated skincare treatments.
• Avoid applying to broken or significantly irritated skin.
• Exercise care when introducing alongside exfoliating acids, retinoids or other potentially irritating treatments.
• Discontinue use if persistent irritation develops.
• Follow with moisturiser to support skin hydration.
• When used during the day, apply SPF 30 or higher as directed by the supplier.
• Store according to the instructions on the product packaging.

Ingredient Disclaimer: Ingredients and formulations may be changed by the manufacturer without prior notice. The ingredient list provided is for reference only. Always check the ingredient list on the product packaging before use, particularly if you have allergies or sensitivities.

11. Glass Ritual Note

Excess oil and visible pores often benefit from targeted care rather than stronger cleansing alone.

COSRX The Niacinamide 15 Serum provides concentrated sebum-focused care while supporting smoother texture and a more even-looking complexion. Introduce it gradually, follow with moisturiser and use sunscreen during the day.