Mela B3 Dark Spot Serum — Reddit Reviews
Updated October 22, 2026
Niacinamide dark-spot serum with occasional wins; results often stall on stubborn pigmentation.
What the community says
This is a niacinamide-focused serum for post-acne marks, sunspots, and melasma routines. Redditors report visible fading after consistent use, yet others see nothing after months; burning also shows up, making patch-testing sensible for reactive skin.
What this means for you
Backed by 27 threads from r/SkincareAddiction, r/30PlusSkinCare and 3 more.
Read the threads ↓What people love
Watch out for
- Many users see no difference after one bottle or three months
- Burning sensation reported immediately after application
- Stubborn sunspots and specific hyperpigmentation can resist it
Product details
Where to buy
What the science says vs. what Reddit says
Acne
Some evidence
Niacinamide: 6 studies tested it on its own. See all 17 studies
Hyperpigmentation
Some evidence
Niacinamide: 4 studies tested it on its own. See all 17 studies
On Reddit: Nightly use over four months brought one commenter a great reduction in dark spots. 12 mentions
What the studies found
Anti-Aging
Some evidence
Niacinamide: 2 studies tested it on its own. See all 8 studies
Skin Barrier
Not proven yet
Few or mixed studies. This claim isn't established.
Niacinamide: 1 study tested it on its own. See all 17 studies
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 42 mentions across 27 threads
La Roche-Posay Mela B3 Dark Spot Serum on Reddit, in one place — 27 threads from r/SkincareAddiction, r/30PlusSkinCare and 3 more, summarized.
“and la roche posay mela b3 every morning”
Positive
“My skincare routine is basically cleaning my face with micelar water, effaclar by la roche posay and biretix every other day at night, and la roche posay mela b3 every morning.”
Positive
“I wear sunscreen every day.”
Positive
“PM: Cleanser (La Roche-Posay Toleriane) → La Roche-Posay Mela B3 serum → La Roche-Posay Cicaplast Gel B5”
Positive
“Open to hearing if this is doing anything useful for the post-AK redness/damage, or if I should be adding/swapping something.”
Positive
“Anything you'd add to or change about my current routine, or anything you'd specifically make sure to ask my derm about at my next visit?”
Positive
“La Roche Posay Mela B3 serum, then wait at least 3 minutes for it to absorb/dry”
Positive
“My skin has had near-zero post-tret peeling since I've started this regimen”
Positive
“Gentle tips that have helped me while re-implementing tret into my PM regimen”
Positive
“La Roche posay mela B3 serum works wonders for dark spots ..... Good luck babe!”
Positive
“Does anyone know what these brown marks are under my eyes and how I can get rid of them?”
Positive
“Hi! Does anyone know what these brown marks are under my eyes and how I can get rid of them?”
Positive
“[La Roche Posay Mela B3 serum ]”
Mentioned
“Evening:”
Mentioned
“Some examples of products that may help:”
Mentioned
“3. La Roche Posay mela B3 serum (for dark spot correction)”
Positive
“My skincare routine tonight is as follows”
Positive
“Everything but the pair acne cream is apart of my normal routine so I will know if the pair is the thing making the difference.”
Positive
