Niacinamide Serum — Reddit Reviews
Updated November 10, 2026
Studies support niacinamide for acne; Redditors report smoother pores, less oil, occasional irritation.
What the community says
A simple niacinamide serum for oily skin, visible pores, and uneven tone. Redditors report smoother cheeks and less shine, while studies found topical niacinamide improved acne in some trials; sensitive or over-treated skin can develop redness and dryness.
What this means for you
Backed by 27 threads from r/koreanskincare, r/SkincareAddiction and 5 more.
Read the threads ↓What people love
- Clinical acne evidence, not just skincare lore
- Smoother pores and less daytime oil
Watch out for
- Too much, too often triggers red dryness and flare-ups
- Breakouts are a real possibility for some users
Product details
Concerns
Use caution
Skin Type
Product Traits
Key Ingredients
Where to buy
What the science says
Niacinamide has some evidence for fading dark spots, as all four studies that tested it directly found it helped patches look lighter 1. Its acne research has some evidence, with most studies finding it helped and a few showing no clear difference 2. Anti-aging research also has some evidence, pointing to firmer skin and fewer wrinkles 3. The skin barrier finding is not proven yet, resting on a single study 4.
- Niacinamide for hyperpigmentation Some evidence · 17 studies
- Niacinamide for acne Some evidence · 17 studies
- Niacinamide for anti-aging Some evidence · 8 studies
- Niacinamide for skin barrier Not proven yet · 17 studies
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
How we grade researchFull ingredient list · 9
Good Molecules Niacinamide Serum ingredients
Water, Niacinamide, Dipropylene Glycol, 1,2-Hexanediol, Glycerin, Betaine, Ammonium Acryloyldimethyltaurate/VP Copolymer, Xanthan Gum, Ethylhexylglycerin
Listed in label order, highest concentration first. Linked ingredients have their own page.
Real Reddit threads — 41 mentions across 27 threads
Good Molecules Niacinamide Serum on Reddit, in one place — 27 threads from r/koreanskincare, r/SkincareAddiction and 5 more, summarized.
“Good Molecules”
Positive
“Niacinamide Serum and Gentle Retinol Cream - only using them at nightime.”
Positive
“Perfect combo for me.”
Positive
“AM: Cerave foaming cleanser, niacinamide serum (Good Molecules), azelaic acid, Cetaphil 35spf moisturizer”
Cautionary
“As a side note, niacinamide twice a day isn't a good idea, especially when you're using something drying like tret.”
Cautionary
“Niacinamide breaks me out horribly”
Cautionary
“I pair that with my Good Molecules Niacinamide face serum”
Positive
“and The Ordinary Azelaic Acid Suspension 10% with some korean moisturizer.”
Positive
“It's been a game changer.”
Positive
“Vitamin C powder by Good Molecules mixed in with their Niacinamide serum got rid of some dark sun spots on my forehead.”
Positive
“I started using Good Molecules 10% niacinamide serum a couple weeks ago”
Positive
“I'm pleasantly surprised with the improvements I'm seeing already with reduction in pore size across my cheeks and nose”
Positive
“I started off just using it in the morning but am now using it every morning and evening”
Positive
“the one i currently like is the good molecules niacinamide serum”
Positive
“it react really well! i have both sensitive and oily skin”
Positive
“niacinamide helps oiliness too”
Positive
