No.5 Vitamin Concentrated Serum — Reddit Reviews
by numbuzin
18recommendationsacross 7 Reddit threads
Updated July 3, 2026
What the community says
Vitamin C + niacinamide serum with melanin inhibitors that many use to fade hyperpigmentation and brighten combination to oily skin, but it can irritate sensitive or acne-prone skin and feels heavy in summer.
What people love
- Contains melanin inhibitors to help fade acne scars and hyperpigmentation
- Niacinamide and vitamin C combo adds brightening and slight hydration
- Despite a heavier texture, it layers decently under makeup and sunscreen
Watch out for
- Often irritating for sensitive and reactive skin, causing redness and breakouts
- Can trigger cystic acne in acne-prone users, especially if skin barrier is compromised
- Texture can feel too heavy or sticky, particularly in hot or humid weather
Product details
Use caution
Skin Type
Product Traits
Key Ingredients
Skin type data limited
Where to buy
Real Reddit threads
7 threads from r/koreanskincare, r/tretinoin +1 more
