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Dark spots, uneven tone, rough texture — this serum targets all three with a concentration of niacinamide high enough to make a real difference. Lightweight enough for daily use, potent enough to see results within a fortnight.
Niacinamide at 15% concentration is the workhorse — here's exactly what it's doing on your skin.
Most niacinamide serums sit at 5–10%. This one goes to 15% — a meaningful step up that you'll actually feel in your results.
Based on user testing of the medicube Niacinamide 15 Serum formula.
After cleansing and toning, press two to three drops into your skin before moisturiser — both morning and evening for best results. Follow with SPF during the day to protect the brighter skin you're working so hard for.
Building confidence with clear answers to your concerns.
Twice daily — morning and evening — gives the best results. If your skin is new to high-concentration niacinamide, start with once a day for the first week and build up from there as your skin adjusts.
Yes, the formula is fragrance-free and designed to be well-tolerated, even on more reactive skin types. That said, we always recommend doing a patch test on your inner arm for 24 hours before incorporating any new active into your full routine.
It has a lightweight, slightly gel-like texture that absorbs quickly without leaving a greasy or sticky residue. Your skin should feel smooth and comfortable immediately after application — not weighed down.
Niacinamide layers well with most actives. It pairs particularly nicely with hyaluronic acid and peptides. If you're using vitamin C or retinol, apply those on alternate days or different parts of your routine to keep irritation to a minimum.
Many users notice a smoother, more hydrated feel from the first use. For visible brightening and a reduction in dark spots, give it a consistent fortnight of twice-daily use — that's typically when the tone-evening effects become clear.
The higher concentration means more niacinamide available to inhibit melanin transfer and support the skin barrier — which translates to faster, more noticeable results. At 15%, you're working with one of the highest over-the-counter concentrations available in a daily serum.
It's particularly effective on uneven skin tone, hyperpigmentation, post-acne dark spots, enlarged-looking pores, and dull, dehydrated skin. If you're dealing with any combination of those, this serum covers a lot of ground in one step.
Yes — think of the serum as your treatment step and moisturiser as the seal that locks everything in. Applying a moisturiser on top also helps buffer the higher niacinamide concentration for those with drier or more sensitive skin types.
Real feedback from real customers.
I've tried so many niacinamide serums and none of them touched my dark spots the way this one has. By the end of the second week my skin looked noticeably more even — my colleagues actually asked what I'd changed. 🌟
The texture is what got me first — it sinks in so fast that I can go straight to moisturiser without waiting around. My post-acne marks have faded significantly and my skin just looks cleaner overall.
Genuinely impressed by how quickly the redness and blotchiness on my cheeks settled down. I did tingle a little the first few days, which is why I'm giving it four stars, but that settled completely after a week.
This is the first skincare product I've repurchased without even finishing the bottle — I didn't want to run out. My skin tone is so much more consistent now, and the hydration lasts all day without me needing to reapply anything.
I was sceptical about 15% because I've had reactions to strong actives before, but this is genuinely gentle. No irritation, no peeling, just progressively brighter skin over a few weeks of consistent use.
Good serum with real results on my hyperpigmentation — I can see the difference in photos I took a month apart. I'd love a slightly larger bottle for the price, but the formula itself is excellent.
My skin barrier feels so much stronger since I started using this. The dryness and flaking I used to get around my nose and chin has almost completely disappeared, and my foundation sits so much better now.
I'm a guy and I hate complicated skincare, so this single serum doing brightening, pore-minimising, and hydration all at once is exactly what I needed. My skin looks healthier and less tired since I started using it.
The brightening effect is real and my dark spots are visibly lighter. I'm giving four stars because I wish the dropper were a little more precise, but the product inside is doing everything it promises.
I've been recommending this to everyone I know with uneven skin tone. After years of trying to fade my melasma patches, this is the first thing that's made a consistent dent — and I notice it every time I catch myself in natural light.
The finish after it absorbs is almost velvety — my skin literally feels smoother to the touch within minutes. Combined with the long-term brightening, this has become the non-negotiable step in my evening routine.
I started using this to deal with the marks left from a breakout and I'm genuinely happy with how much they've faded. Takes about two weeks to really see it, but once you do it's obvious something is working.
Fragrance-free is a dealbreaker for me and this ticks that box completely — no scent, no irritation, no drama. Just calm, brighter skin that looks like I've been sleeping properly even when I haven't.
I've been layering this under my SPF every morning and the combination has completely transformed my morning routine. My skin looks glowy rather than dull when I head out, which is something I'd genuinely given up on.
Really solid serum that works well for my oily skin — it doesn't make me look greasy or shiny, which is rare for a hydrating product. My pores look smaller and my skin tone is more consistent than it's been in years.
As someone who was hesitant to get into K-beauty, this serum converted me completely. No fuss, no complicated instructions — just apply it and watch your skin gradually become the version of itself you forgot was possible.
The absorption speed is unreal for how hydrating it is. I apply it straight after toning and within thirty seconds it's completely gone into my skin — no white cast, no tackiness, just that smooth, plumped feeling I love.
