ProtoClinical k-beauty COSRX The Niacinamide 15 Serum 20ml single centered serum bottle on a white background with dark gray packaging
ProtoClinical k-beauty COSRX The Niacinamide 15 Serum 20ml single centered serum bottle on a white background with dark gray packaging
COSRX

COSRX The Niacinamide 15 Serum 20ml

$15.72
Delivers concentrated actives deep into the skin Targets specific concerns with a lightweight, fast-absorbing formula Helps improve skin texture and tone with consistent use
Total acne care with 15% niacinamideHighly concentrated serum that combines the maximum concentration of niacinamide with optimal ratios of synergistic ingredients for total acne control. 
For all skin types dealing with acne and breakouts: COSRX's serum with Niacinamide works from within to deliver delivers concentrated actives deep into the skin, not just temporary comfort.
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Korean Beauty Formulation Suitable for Daily Use
tone-up pigments
COSRX The Niacinamide 15 Serum 20ml
COSRX The Niacinamide 15 Serum 20ml Default Title
$15.72
Clinically proven actives Dermatologist tested 100% authentic Korean Cruelty-free
What's inside ·

tone-up pigments, the repair molecule

Niacinamide works at the junction between melanocytes and keratinocytes, intercepting melanin transfer before pigment reaches the visible surface. It simultaneously boosts ceramide synthesis to strengthen the lipid barrier, which is why consistent use addresses both discoloration and dehydration. In this serum, Niacinamide targets acne and breakouts, delivering delivers concentrated actives deep into the skin with consistent use.
Niacinamide 15%
intercepts melanin transfer to fade spots and refine pore texture from within
The texture

Lightweight, absorbing serum

Total acne care with 15% niacinamide


Highly concentrated serum that combines the maximum concentration of niacinamide with optimal ratios of synergistic ingredients for total acne control. 

All Skin Types acne breakouts excess oil clogged pores
Hover the swatch — it ripples like water

How to use

Wear alone or under makeup.
Full transparency

Ingredients

Tone-up pigments in a light cream-lotion base that brightens and smooths the look of skin.

COSRX The Niacinamide 15 Serum 20ml is built around a high-concentration niacinamide serum created for acne-prone and oily skin. Its ingredient story centers on 15% niacinamide and synergistic oil-balancing support ingredients. In cosmetic formulas, these materials are used because they can help regulate excess sebum, reduce the look of active breakouts, and keep pores appearing cleaner and more balanced. That matters for this product format because a serum texture is useful because oil-control care usually works best in a thin layer that can be directed where shine is most noticeable. Rather than promising instant transformation, the formula is designed to improve skin gradually through hydration support, barrier comfort, and steady visible refinement. With consistent use, that kind of approach can help skin look calmer, brighter, smoother, firmer, or more balanced depending on the product goal, while keeping the routine wearable. Texture also shapes performance: essences and serums layer easily, while creams create a more protective finish and targeted spot formulas stay focused where they are needed. In short, the science behind this product is ingredient synergy matched with a texture that helps those ingredients work in a practical daily routine.

The detail

Specs & details

FormatLightweight serum
SizeDefault Title
Skin typesAll Skin Types
Country of originSouth Korea
Pairs beautifully with

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$15.72
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Questions & answers

After cleansing and toning, before moisturizer. Serums deliver actives most effectively on freshly prepped skin.
Yes. Apply from thinnest to thickest consistency and allow each layer to absorb before the next.
Most users notice initial improvement within 2 to 4 weeks. For full benefits like delivers concentrated actives deep into the skin, allow 6 to 8 weeks of consistent use.
Your skin begins adjusting. You may notice improved hydration and comfort before more visible changes like texture refinement become apparent.
Yes, this formula is developed to be compatible with all skin types dealing with acne and breakouts. If you have very reactive skin, patch test on the inner arm before full application.
The formula is designed to be well-tolerated. For pregnancy-specific concerns, consult your healthcare provider. For sensitive skin, patch test before full application.
Niacinamide intercepts melanin transfer to fade spots and refine pore texture from within. Consistent daily use is key to seeing the full benefits.
Check the INCI list for the most accurate information on fragrance components. The formula is developed for minimal irritation potential.
Store in a cool, dry place away from direct sunlight. Use within 12 months of opening for optimal freshness and efficacy.
Serums have a higher concentration of targeted actives than essences and a lighter consistency than most ampoules. They deliver the most potent treatment in your routine.
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About the brand

OriginSeoul, KR
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