COSRX Niacinamide
Niacinamide is one of COSRX's quiet workhorses. It shows up most directly in The Niacinamide 15 Serum, a concentrated treatment aimed at uneven tone and visible pores, and in the brand's Niacinamide Micellar Cleansing Waters, which fold the ingredient into a low-pH cleanse. Beyond the products that name it on the label, niacinamide turns up across COSRX formulas as a supporting brightening and barrier ingredient, which is why this collection pulls together a wider set of serums, ampoules, and moisturisers worth pairing with it. If you're trying to even out tone, calm redness, or keep oil in check without irritation, niacinamide is a gentle place to start. Explore the range below and slot it into the treatment step of your routine.
Buying guide
Using COSRX niacinamide in your routine
Niacinamide is a form of vitamin B3 that shows up across COSRX's range, both as the headline ingredient in dedicated products and as a supporting act in serums and moisturisers. This guide explains what it does and how to build it into a routine using the COSRX products we stock.
What niacinamide does for skin
Niacinamide is valued for helping even out tone, soften the look of pores, and support a healthy moisture barrier. It tends to be well tolerated, which is part of why it appears so often in Korean formulas. Unlike some active ingredients, it doesn't make skin sun-sensitive, so it fits comfortably into both morning and evening routines.
The Niacinamide 15 Serum
The most direct way into the ingredient is The Niacinamide 15 Serum, a focused 20 ml treatment built around a high niacinamide level. It targets uneven tone and visible pores in the treatment step of a routine. Because it's concentrated, many people introduce it gradually, using it once a day at first and building up as their skin gets used to it.
Niacinamide micellar cleansing water
COSRX also offers Niacinamide Micellar Cleansing Water in a generous 400 ml bottle. It's a mildly acidic, low-pH way to lift makeup and grime while still delivering a touch of niacinamide. It works as a first cleanse or a quick refresh, and suits people who want a low-effort step before their main wash.
Pairing niacinamide with other actives
Niacinamide plays nicely with most ingredients, which makes it easy to layer. You can follow it with the Advanced Snail Radiance Dual Essence for extra hydration, or alternate it on different days with COSRX's Retinol 0.5 Oil or the AHA/BHA Vitamin C Refresh Booster Serum. If you're using several actives, space the stronger ones across morning and night so your skin isn't doing too much at once.
Barrier and soothing support
Because niacinamide supports the barrier, it pairs well with calming moisturisers. The Pure Fit Cica Cream and the A.C. Collection Lightweight Soothing Moisturizer are easy companions, sealing in your serum while keeping things light. This combination suits skin that's reactive or going through a phase of redness, since neither step adds heavy fragrance or strong acids.
How to introduce niacinamide
If niacinamide is new to you, start slow. Use a single product first, such as the serum or the cleansing water, and give your skin a couple of weeks before adding more. Patch testing on a small area helps you spot any sensitivity early. Once your skin is comfortable, you can build up to daily use and combine steps.
Morning or night?
Niacinamide is flexible. It doesn't increase sun sensitivity, so you can use it in the morning under sunscreen or at night as part of your treatment routine, or both. Many people put the serum in the morning to support tone through the day and save heavier or exfoliating steps for the evening.
FAQ
Frequently asked questions
FAQ
Frequently asked questions
What is The Niacinamide 15 Serum used for?
The Niacinamide 15 Serum is COSRX's concentrated niacinamide treatment, aimed at evening out skin tone and softening the look of pores. It's a 20 ml serum that sits in the treatment step of a routine. Because the niacinamide level is high, many people start with once-daily use and build up gradually.
Does COSRX niacinamide make my skin sensitive to the sun?
No. Unlike acids or retinol, niacinamide does not increase sun sensitivity, so you can use it in the morning or at night. That said, daily sunscreen is still worth wearing, especially if you're also using brightening products that target tone.
Can I use COSRX niacinamide with retinol or vitamin C?
Yes. Niacinamide layers well with most ingredients. You can alternate it across different days with the COSRX Retinol 0.5 Oil or the AHA/BHA Vitamin C Refresh Booster Serum, or use niacinamide in the morning and a stronger active at night. Spacing the more intense steps apart helps keep skin comfortable.
Is niacinamide suitable for sensitive skin?
Niacinamide is generally well tolerated, which is part of why it appears so widely in COSRX formulas. If your skin is reactive, start with one product and pair it with a calming moisturiser like the Pure Fit Cica Cream. Patch testing first lets you check how your skin responds before making it a daily habit.
How does the Niacinamide Micellar Cleansing Water fit in?
The Niacinamide Micellar Cleansing Water is a mildly acidic, low-pH cleanse that lifts makeup and grime while adding a little niacinamide. Use it as a first cleanse before your main wash, or as a quick refresh on a low-effort day. It comes in a 400 ml bottle, so it lasts through plenty of uses.