No.5 Vitamin Concentrated Serum — Reddit Reviews
by numbuzin
Updated August 19, 2026
Niacinamide and tranexamic acid serum praised for fading dark spots; may irritate.
What the community says
This serum targets hyperpigmentation with 5% niacinamide and 4% tranexamic acid, favored by those fighting uneven skin tone or dullness. It suits combination skin but can cause irritation or breakouts, especially on sensitive or acne-prone skin. Consistent use and sunscreen are essential to see fading effects over weeks.
What this means for you
What people love
- High 5% niacinamide and 4% tranexamic acid boost brightening
- Gentle with slight moisturizing effect, good layering under makeup
- Effective for hyperpigmentation when used consistently with sunscreen
Watch out for
Product details
Use caution
Skin Type
Product Traits
Key Ingredients
Where to buy
Real Reddit threads — 93 mentions across 26 threads
numbuzin No.5 Vitamin Concentrated Serum on Reddit, in one place — 26 threads from r/koreanskincare, r/AsianBeauty and 1 more, summarized.
“The Numbuzin No5 serum is incredible! Great haul!”
Mentioned
“Love the haul 😍”
Mentioned
“Yes I totally love Skin1004 and their store in Seoul is so pretty.”
Mentioned
“Numbuzin No.5+ Glutathione Vitamin Concentrated Serum”
Mentioned
“Serums/Creams:”
Mentioned
“Here is the list of items. I've arranged them into categories.”
Mentioned
“I have faint acne hyperpigmentation left which is fading by numbuzin no 5 serum and toner pad.”
Mentioned
“numbuzin no 5 serum”
Mentioned
“numbuzin 5+ serum”
Positive
“Holy grails: acwell licorice toner, haru haru black rice toner, numbuzin 5+ serum”
Positive
“numbuzin 5+ serum and the numbuzin nad+ 9 serum”
Positive
“Numbuzin no5 serum”
Positive
“and Numbuzin no 5 vit c serum ofcourse I'm on my 6th bottle right now”
Positive
“Numbuzin No 5 serum”
Positive
“Added later on: Numbuzin no5 brightening serum (replaced axis-y and vit c)”
Positive
“Numbuzin no5 brightening serum (replaced axis-y and vit c)”
Positive
“I did get these result with this routine.”
Positive
Dupes & Alternatives
Anua
Azelaic Acid Hyaluron Redness Soothing Serum
Better for Hyperpigmentation
8 shared traits
549 mentions
Skin1004
Madagascar Centella Asiatica Ampoule
Better for Redness / Irritation
6 shared traits
428 mentions
