No. 90
in skincare
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We earn a commission on Amazon purchases — rankings are based on Reddit consensus, not commission rates.
How it works.
61% would recommend
Why we ranked it No. 90 in skincare
Sample
53 redditors with explicit opinion · 8 positive · 5 negative · 0 neutral
Score0.615 — formula: 0.75 × % positive + 0.25 × pos/neg ratio
Confidence95% CI: 36–82% · the true approval rate falls in this range with 95% statistical confidence
Verdict
Recommended — ≥50% positive. Mixed but more good than bad.
Sources
r/koreanskincare, r/KoreanBeauty, r/AsianBeauty, r/tretinoin
numbuzin · skincare
Recommended
No.5 Vitamin Niacinamide Concentrated Serum
r/koreanskincarer/KoreanBeautyr/AsianBeautyr/tretinoin
TL;DR — Reddit consensus
Brightening serum (TXA 4% + niacinamide 5% + glutathione) with real dark-spot wins on Reddit — and a visible minority reporting purging or no effect.
Amazon vs Reddit
Amazon loves it. Reddit isn't sold.
On Amazon: ★4.5 from 5,173 reviews — that's roughly 88% positive.
On Reddit: 61% of 53 redditors recommend it.
The gap of 26 points is unusual and worth reading the cons before you buy.
What redditors love
+
Dark spots and post-acne marks fade with consistency
“numbuzin no.5 glutathione txa advanced dark spot ampoule concentrate, and their no.5 glutathione vitamin concentrated serum. i'm a toner freak, and i love their no.3, n”
u/Jhero61 · r/koreanskincare →
+
Plays well under sunscreen
“skin the glow! it’s very soothing even when my barrier was broken, this didn't break me out at all. i highly recommend using this with the vt reedle shot. 5. **numbuzin no.5 vitamin concentrated serum** : i got this to brighten my post-acne marks and it didn't break out my sensitive skin at all. i u”
u/Real_City3177 · r/AsianBeauty →
What they don’t
−
A loud minority saw purging or zero change
“ry prone to closed comedones and fungal acne, so i need serums that won’t cause more breakouts. the products i have tried in the past for hyperpigmentation: 1. numbuzin no. 5 toner pads – they brightened my skin a little and slightly helped with dark spots, but they didn’t help with the hyperpigment”
u/Proof-Particular-915 · r/KoreanBeauty →
−
Slow — weeks before visible difference
“ry prone to closed comedones and fungal acne, so i need serums that won’t cause more breakouts. the products i have tried in the past for hyperpigmentation: 1. numbuzin no. 5 toner pads – they brightened my skin a little and slightly helped with dark spots, but they didn’t help with the hyperpigment”
u/Proof-Particular-915 · r/KoreanBeauty →
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Direct quotes
What 8 redditors actually said.
Top 6 by confidence shown — expand below for the rest. Click any to open the original on Reddit.
R
u/Real_City3177
·
r/AsianBeauty
skin the glow! it’s very soothing even when my barrier was broken, this didn't break me out at all. i highly recommend using this with the vt reedle shot. 5. **numbuzin no.5 vitamin concentrated serum** : i got this to brighten my post-acne marks and it didn't break out my sensitive skin at all. i use it 2-3 times a we
Y
u/yabasicjanet
·
es (i'm on box 3). calming and hydrating and while not like a hg acne product, i do feel that my breakouts have been really reduced in amount and severity. the numbuzin no 5 pads are also stealing my heart. there's a jelly side and a textured side, and have a bit of pha and lha along with a bunch of nice brightening in
R
u/randomacquaintance
·
r/KoreanBeauty
i’m surprised you said that about biodance, those masks are my hg to glass skin. i use one every sunday. 💕 eta: the numbuzin no 5 didn’t do a lot for me and i chose not to rebuy. it is definitely very gentle and i wanted to love it but it just didn’t seem to change anything
C
u/Crazy_Sundae_6995
·
r/KoreanBeauty
numbuzin no. 5 gluta vitamin serum is my hg!!!! i’ve repurchased many times and recently bought 3 of their 2-pack to stock up. i’m medium/tan and always get hyperpigmen
J
u/Jhero61
·
r/koreanskincare
numbuzin no.5 glutathione txa advanced dark spot ampoule concentrate, and their no.5 glutathione vitamin concentrated serum. i'm a toner freak, and i love their no.3, n
C
u/cuddleisha
·
r/koreanskincare
wow i love this comprehensive message, i will definitely check out different toners and serum. i recently just bought the numbuzin no.5 vitamin serum which comes in tomorrow, do you think i maybe try this serum out and have a break from anua? thank you again for your well thought out messa
Threads tracked
The conversations we're watching.
●
r/AsianBeauty
r/AsianBeauty
●
Toner Pads
●
r/KoreanBeauty
Please Influence Or Deinfluence Me
●
r/KoreanBeauty
Please Influence Or Deinfluence Me
●
r/koreanskincare
Serum Holy Grails
●
r/koreanskincare
My Skincare Routine Makes My Skin Feel So Sticky
●
r/koreanskincare
What Toner Is The Best
●
r/tretinoin
2 Year Transformation
Read also
Reddit deep-dives that mention this product.
Adjacent
Often mentioned in the same threads.
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★ · on Amazon
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Beauty of Joseon
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Lightweight Korean sunscreen that feels like nothing on skin—no white cast, applies clear in seconds.
★ · 462 Amazon reviews
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