The Niacinamide 15 Serum (20ml)

Name: The Niacinamide 15 Serum (20ml)
Brand: COSRX
SKU: IKG-SR-COS-020M-001
Price: 22.00 GBP
Availability: InStock

£22.00

Best for: Stubborn pigmentation, uneven tone, excess oil, and visible pores
Step: Step 6 – Serum / Ampoule
Routine: AM & PM (start once daily if new to high-strength actives)
High-level description: A high-strength 15% niacinamide serum that targets dark spots, breakouts, and enlarged pores for clearer, brighter, and more balanced skin.

Category: Serum & Ampoule

A concentrated brightening serum with pure 15% niacinamide, zinc PCA, and acetyl glucosamine to visibly fade hyperpigmentation, control excess oil, and refine texture.

This potent yet balanced formula smooths and clarifies the skin while reinforcing its natural barrier.

With consistent use, it helps even tone, reduce post-blemish marks, and brighten dull complexions for a healthy, luminous glow.

Delivers visible results on dark spots and post-acne marks.
Regulates sebum and reduces shine for balanced, clarified skin.
Helps refine pores and smooth overall texture.
Strengthens the barrier while providing light hydration.
Curated pick: A top team favourite — this 15% pure niacinamide serum has helped visibly fade pigmentation, refine pores, and control oil production over time, leaving skin brighter, smoother, and more even.

Niacinamide (15%) – High-strength brightener that evens tone, visibly reduces dark spots and redness, and refines pores.
Zinc PCA – Balances oil and supports acne-prone skin while soothing inflammation.
Acetyl Glucosamine – Works synergistically with niacinamide to gently exfoliate and fade discoloration.
Allantoin & Trehalose – Calm sensitivity and deliver lightweight moisture.
Tocopherol (Vitamin E) – Provides antioxidant support for smoother, more resilient skin.

After cleansing and toning, apply 2–3 drops over the entire face or targeted areas.
Gently pat until absorbed.
Follow with moisturiser and, in the morning, suncream.
Introduce gradually (every other day → daily use) to allow skin to adapt.

Step 1: Oil Cleanser → Step 2: Water-Based Cleanser → Step 3: Exfoliator → Step 4: Toner → Step 5: Essence → Step 6: Serum / Ampoule (This Product) → Step 7: Eye Care → Step 8: Mask → Step 9: Moisturiser → Step 10: Suncream

Skin Types: Suitable for most skin types, but those with sensitive skin should introduce slowly or mix with a moisturiser to allow adjustment.

Concerns: Pigmentation, Post-Acne Marks, Uneven Tone, Pores, Excess Oil, Breakouts, Texture

Pairs well with: Hydrating and calming ingredients such as Hyaluronic Acid, Panthenol, and PDRN — these balance the potency of 15% Niacinamide, maintaining comfort while refining pores and improving tone. Centella and Allantoin also complement it by soothing potential dryness.

Compatible with: Barrier-repairing ingredients like Ceramides, Snail Mucin, and Peptides layer well for added hydration and firmness. It can also be used with gentle brighteners such as Tranexamic Acid or Alpha Arbutin for enhanced clarity and radiance.

Avoid using with: Strong exfoliating acids (AHA/BHA/PHA) or highly concentrated Vitamin C (L-Ascorbic Acid) in the same routine, as low-pH actives may reduce Niacinamide stability and increase irritation. Alternate use, or apply these at opposite times of day, to maintain balance.

Layering tip: Apply after toner and before thicker serums or creams. If combining with multiple actives, allow this serum to absorb fully for about a minute before layering others to reduce potential tingling.

Pro Tip: Though suitable for most skin types, 15% Niacinamide is a high concentration — introduce gradually (every other night at first). Pairing with barrier-supportive layers rich in PDRN, Panthenol, or Snail Mucin helps skin adapt smoothly and retain a healthy, refined glow.

Hyaluronic Acid
Niacinamide

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.