
Mela B3 Dark Spot Serum — Reddit Reviews
Updated October 3, 2026
Niacinamide-based dark spot serum for hyperpigmentation; mixed results, burning reports.
What the community says
A niacinamide-heavy dark spot serum people mostly reach for on melasma, post-acne marks, and stubborn sun spots. Redditors split hard: some see fading, others get burning or nothing after months, so YMMV if your skin is reactive or impatient.
What this means for you
Backed by 27 threads from r/SkincareAddiction, r/30PlusSkinCare and 3 more.
Read the threads ↓What people love
- Niacinamide-heavy dark spot focus
- Can visibly fade stubborn pigmentation
- Often layers fine in AM or PM routines
Watch out for
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: 5 studies tested it on its own. See all 20 studies
On Reddit: After four months of nightly use, one commenter reports a great reduction in pigmentation. 11 mentions
What the studies found
- All 5 studies that tested it on its own found it helped fade dark spots
- On its own, it reduced facial darkening and made skin look lighter than a placebo
- It also improved dark spots linked with sun damage in one clinical trial
- Used with other ingredients, it faded patches more than niacinamide alone or the other ingredient alone
- The side effects were similar and mild in the study that reported them
Anti-Aging
Some evidence
Niacinamide: 3 studies tested it on its own. See all 9 studies
What the studies found
- All 3 studies that tested it on its own found it helped with signs of aging
- Studies found it improved the look of wrinkles and made skin seem firmer
- Studies also found it helped dark spots and reduced redness and yellowing
- One study found it helped skin hold more water and lowered water loss through the skin
- Used with another ingredient, it improved dark spots, fine lines, wrinkles, and firmness more than niacinamide alone
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 — 38 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





