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@madaboutskin reviewing numbuzin Glutathione Vitamin Concentrated Serum at 07:14 in a YouTube Shorts videoNo.5+ Glutathione Vitamin Concentrated Serum"One product that I found... that just works just works is this."$26.00@madaboutskin reviewing numbuzin No.9 NAD+ BIO Lifting-sil Essence at 08:23 in a YouTube Shorts videoNo.9 NAD+ BIO Lifting-sil Essence"It lifts, it firms, it plumps, it does it all."$33.00jameswelsh mentioning numbuzin No.3 Skin Softening Serum at 06:27 in their YouTube videoNo.3 Skin Softening Serum"I ended up using this every single day, twice a day."$28.00@madaboutskin reviewing numbuzin No.1 Pantothenic B5 Active Soothing Serum at 10:23 in a YouTube Shorts videoNo.1 Pantothenic B5 Active Soothing Serum"This is phenomenal if you have what I call winter skin."$28.00madaboutskin mentioning numbuzin Advanced Dark Spot Ampoule at 14:21 in their YouTube videoNo.5 Glutathione TXA Advanced Dark Spot Ampoule Concentrate"The new ampule that does contain the tranexamic acid is phenomenal."-

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No.5+ Glutathione Vitamin Concentrated Serum
4.9No.5+ Glutathione Vitamin Concentrated Serum
  • “One product that I found... that just works just works is this”6:58–7:03
  • “When I see a breakout happening... I start on this straight away. Twice a day, work it into the area. I don't get any hyperpigmentation from that breakout. It heals in the shortest possible time and it just works”7:14–7:22
  • “If you have hyperpigmentation that isn't linked to breakouts, this will still work”7:28–7:32
  • “This is almost like a booster, a way to turbocharge your hyperpigmentation routine”7:42–7:48
  • “This is just a little miracle”
  • “If you're on a hyperpigmentation journey and you want like a flash 2-week treatment that's just going to take your results from here to here, get this. You won't look back. So, so good”7:07–7:11
  • “If you're an acne sufferer like me, that's a little dream”8:44–8:49
  • Source: 5 game changing serums everyone should try - Apr 20, 2026
Mad About SkinMad About Skin718K subscribers
4.5No.5+ Glutathione Vitamin Concentrated Serum
  • “So many of you consider this as a vitamin C serum no it's not this is technically your multivitamin serum”
  • “Majorly contains 5% niacinamide, 4% tranexamic acid, and cowberry extract, to brighten up your skin”
  • “Formulation is very stable, and it's not vitamin C concentrated product, you can easily store it at the room temperature”
  • “This serum has very very pale yellow cushy kind of a texture and when you apply it on your skin it feels very hydrating on the skin”
  • “It's not gonna feel sticky but it will feel very hydrating on the skin”
  • “I feel every skin type can use it”
  • “This numbuzin serum does work in fading your red acne marks and brown acne marks”
  • “You should be able to see a huge difference if you use it daily for one to two months”
  • Source: Reviewing 4 Popular Brightening Korean Serums for Dark Spots - Nov 21, 2025
Shelley NayakShelley Nayak41K subscribers
4.2No.5+ Glutathione Vitamin Concentrated Serum
  • “This one I find is a community favorite”
  • “The texture of this is slightly viscous but it absorbs well and layers beautifully under my moisturizer”5:11–5:20
  • “It's known as a brightening cocktail because it's loaded with ingredients that target both PIE and PIH”5:20–5:33
  • “I find that this serum can give you a glow up over two to three weeks of use, especially improving overall clarity and the tone of your skin”5:47–5:55
  • “This one can cause minor purging if your skin is not used to multiple brighteners, especially if your skin can't handle niacinamide and vitamin C derivatives together”5:55–6:07
  • “I think that this is great for people who have both red and brown marks and want an allrounder serum”6:11–6:19
  • “The only downside that I find with this serum is that it's not ideal if your skin is extremely sensitive or currently breaking out badly”6:19–6:28
  • Source: Best serums for fading acne spots - Nov 5, 2025
Charisse DailyCharisse Daily41K subscribers
No.9 NAD+ BIO Lifting-sil Essence
5No.9 NAD+ BIO Lifting-sil Essence
  • “It lifts, it firms, it plumps, it does it all”8:20–8:25
  • “This has been on rotation for me for many, many, many months”8:23–8:29
  • “I've talked about it very openly on the channel about how it's my favorite product”8:28–8:30
  • “50 different peptides. And really, the brand have thought about choosing each one of those individual peptides to focus down on the firming, the lifting, and the plumping”8:44–8:48
  • “It plumps like no other”9:04–9:07
  • “It firms, it lifts in the long term, but in the short term it just gives you that beautiful finish and a guaranteed good skin day”9:17–9:26
  • “If there was one product from this whole like 10 favorites list that you should get, I would probably recommend that”9:31–9:39
  • Source: Korean skincare awards 2025 - best k-skincare of the year - Nov 28, 2025
Mad About SkinMad About Skin718K subscribers
4.9No.9 NAD+ BIO Lifting-sil Essence
Tina Tanaka HarrisTina Tanaka Harris274K subscribers
4.9No.9 NAD+ BIO Lifting-sil Essence
Tina Tanaka HarrisTina Tanaka Harris274K subscribers
4.2No.9 NAD+ BIO Lifting-sil Essence
  • “This has probably one of the longest ingredient lists I've ever seen in my life”21:35–21:39
  • “I do think in general this ingredient list is extraordinary and it has so many good things”
  • “They have done a lot of extensive clinical tests which prove that it helps your skin, obviously your any wrinkles, it helps keep your clear skin, it's anti-aging, all of that stuff which actually they seem very confident in it”22:42–22:48
  • “I do think for the price this is really good”22:57–23:01
  • Source: Korean skincare viral products deep dive - May 14, 2026
Lisa EldridgeLisa Eldridge2.1M subscribers
No.3 Skin Softening Serum
4.9No.3 Skin Softening Serum
  • “I ended up using this every single day, twice a day”6:18–6:23
  • “It's like a very ferment serum with galactomyces and bifida ferment lysate. So very essency actually”6:21–6:32
  • “Focusing on barrier support, brightening, elasticity of the skin, you know, it's a typical well-aging essence formulation”6:32–6:38
  • “This one is a very slow burn, I would say. But after a few weeks, your skin just looks better, smoother, more even. Feels more resilient as well”6:56–7:00
  • “Slightly thick, but very lightweight, but sinks in so nice to the skin”7:04–7:10
  • “Does give you that nice well hydrated glow, but very natural”7:08–7:15
  • “Number three is essentially about textured skin and elasticity. And this is the kind of serum that makes your whole routine kind of like work better”7:19–7:23
  • “I have noticed I'm kind of building texture back up in my skin on purpose for something else. And it's very easy to do that when I'm not using this serum”7:32–7:40
  • Source: Holy grail Korean skincare that transformed my skin - May 1, 2026
James WelshJames Welsh1.6M subscribers
4.5No.3 Skin Softening Serum
  • “This one also has a light watery gel texture”6:43–6:50
  • “It's a lightweight watery gel that sinks into your skin almost instantly”6:56–7:02
  • “It doesn't leave any stickiness or oiliness behind”7:02–7:10
  • “It just gives you that smooth hydrated finish”7:07–7:13
  • “This one is also oil free and non-comedogenic making it a great match for oily, acne prone and combination skin”7:21–7:32
  • “It's not completely fragrance-free”7:32–7:36
  • “The key actives in here are niacinamide, fermented filtrate complex including galactomyces and bifida and adenosine”
  • “These ingredients work together to smooth rough texture, minimize the look of pores and even out your skin tone over time”7:51–7:57
  • Source: Top Korean serums for oily skin - Nov 8, 2025
Charisse DailyCharisse Daily41K subscribers
4.5No.3 Skin Softening Serum
Charisse DailyCharisse Daily41K subscribers
No.1 Pantothenic B5 Active Soothing Serum
4.5No.1 Pantothenic B5 Active Soothing Serum
  • “This is phenomenal if you have what I call winter skin”10:22–10:26
  • “If you are going through some dryness, some sensitivity, some irritation, and you want a simple but hyper effective serum to deal with it, this is great”10:23–10:36
  • “You can mix this in with your moisturizer to just add some extra soothing and calming to your routine”10:34–10:38
  • “It's super lightweight, so you can put multiple layers of it on top of itself if you want to get that really deep soothing and calming action”10:57–11:01
  • “You could, if your skin is really going through it in winter, just cleanse with a gentle cleanser. Put this on, put your sunscreen on, get out the door. Your skin will heal itself within a couple of days”11:11–11:14
  • “I mix this in with my moisturizer. I use it on the hands. Makes for a terrific hand cream”11:28–11:33
  • Source: Korean skincare awards 2025 - best k-skincare of the year - Nov 28, 2025
Mad About SkinMad About Skin718K subscribers
No.5 Glutathione TXA Advanced Dark Spot Ampoule Concentrate
Brand note

Numbuzin is a Korean skincare brand that leans into functional, ingredient-dense serums and sunscreens, often with a brightening or anti-aging focus. The No.5+ Glutathione Vitamin Concentrated Serum is a standout — a lightweight, hydrating brightening cocktail that can fade red and brown marks over a few weeks, though it may cause purging for sensitive skin and isn't effective on melasma or old dark spots. Overall, the brand suits people who want targeted treatments with visible results, but some products can be hit-or-miss depending on your skin's tolerance.

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