— · Serum
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4.8
280 reviews
Rating breakdown
Most-mentioned keywords
Why consumers buy
COSRX brand trust
Many buyers say they already love other COSRX products (Vitamin C serum, retinol cream, pads) and added this serum because the brand 'never disappoints.'
High-concentration niacinamide ingredient reputation
Reviewers specifically sought out the 15% niacinamide formulation for oil control, brightening, and pore care, often citing it as a known effective ingredient.
Repeat/repurchase loyalty
A large share of reviews mention this being their 2nd, 3rd, 4th, or even 5th bottle, indicating strong retention once tried.
Word-of-mouth and influencer recommendations
Several buyers cite recommendations from friends, family, or YouTubers/social media as the reason for trying the product.
Value compared to competitors
Multiple reviewers directly compare it favorably to The Ordinary's niacinamide, calling COSRX's version more effective or better quality for a similar or better price.
How they use it
Layered with Vitamin C (time-split routine)
Many users apply Vitamin C serum in the morning and this niacinamide serum at night (or vice versa) to avoid combining the two actives.
Skin concerns raised — and how the product addressed them
✓Reviewers report noticeably less shine and reduced oil production, especially in the T-zone, with regular use.
✓Many acne-prone users note fewer new breakouts and faster healing of existing blemishes over weeks of use.
✓Consistent use is frequently linked to visibly smaller-looking pores and smoother texture, particularly after a month or more.
Sentiment breakdown
Share of analyzed reviews by overall sentiment.
Paired with retinol
Several reviewers apply the niacinamide before or alongside COSRX retinol cream, reporting improved tolerance and results from the combination.
Targeted application to oily zones
Some users apply it specifically to the T-zone or nose where sebum and pores are most problematic rather than the whole face.
Frequency adjusted for sensitivity
Sensitive-skin users often reduce use to every other day, a few times a week, or only when needed, gradually increasing to daily as skin adapts.
Used as a buffer before actives/acids
A number of reviewers use it as a gentle base layer before stronger acids or retinol to reduce irritation.
✓Users report fading of dark spots and post-acne marks along with a brighter, more even overall skin tone.
✓Most sensitive-skin users tolerate it well long-term, though some experience initial stinging that subsides with reduced frequency or smaller amounts.
Concerns and outcomes summarized from reviews; percentages are approximate.
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