Side-by-side comparison

La Roche-Posay Mela B3 Dark Spot Serum vs The Ordinary Niacinamide 10% + Zinc 1%

Both are serums. They share a 70% active-ingredient overlap, so the real decision is about price, texture and the supporting ingredients. Here's the side-by-side.

70%Active overlap
La Roche-Posay
Mela B3 Dark Spot Serum
SerumPremiumMorning or evening
Dark SpotsPost-Acne MarksDullness

A pigment-targeting serum built on Melasyl plus 10% niacinamide for stubborn dark spots and post-acne marks. A clinical-leaning brightening serum; results on melasma and PIH build slowly over weeks with diligent SPF.

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The Ordinary
Niacinamide 10% + Zinc 1%
SerumBudgetEvening only
OilinessAcneDark SpotsRough Texture

High-dose niacinamide serum targeting sebum regulation, visible pore appearance and post-acne marks. Water-based, fragrance-free, and compatible with almost every other active on the shelf — the default oil-control serum for combination and oily skin.

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The verdict

Which should you choose?

On price, the The Ordinary Niacinamide 10% + Zinc 1% sits in the Budget tier versus Premium for the La Roche-Posay — so it's the more budget-led pick if the overlap is what you're after. On how you'd use them, the La Roche-Posay is flagged Morning or evening while the The Ordinary is flagged Evening only. The La Roche-Posay leans toward Dullness, Post-Acne Marks. The The Ordinary leans toward Acne, Oiliness, Rough Texture.

The overlap

What they share

At 70% active overlap, these are the ingredients doing comparable work in both formulas:

Niacinamide
The formulation

Ingredient stacks, side by side

La Roche-Posay — top of the list

  • Aqua~50–80%
  • Glycerin~5–25%
  • Niacinamide~3–10%
  • Melasyl~2–6%
  • Dimethicone~1.5–4%

The Ordinary — top of the list

  • Aqua (Water)~50–80%
  • Niacinamide10%
  • Pentylene Glycol~3–10%
  • Zinc PCA1%
  • Dimethyl Isoso…~1.5–4%

● marks ingredients that appear near the top of both lists. Percentages are positional estimates from INCI order, not disclosed doses.

At a glance

The specs

La Roche-PosayThe Ordinary
CategorySerumSerum
Price tierPremiumBudget
Best forDark Spots, Post-Acne Marks, DullnessOiliness, Acne, Dark Spots
Usage notesMorning or eveningEvening only
Active overlap70% — Niacinamide
Questions

Common questions

Is the La Roche-Posay Mela B3 Dark Spot Serum or the The Ordinary Niacinamide 10% + Zinc 1% better?
Neither is universally better — they share 70% active-ingredient overlap, so for the actives that drive results they're close. The The Ordinary Niacinamide 10% + Zinc 1% is the more budget-friendly option, while the other may differ on texture, finish and supporting ingredients. Pick based on your skin's priorities rather than a single 'winner'.
What's the difference between the La Roche-Posay Mela B3 Dark Spot Serum and the The Ordinary Niacinamide 10% + Zinc 1%?
Both are serums that share Niacinamide. Where they differ: they sit in different price tiers (Premium vs Budget); the La Roche-Posay is Morning or evening; the The Ordinary is Evening only; the La Roche-Posay targets Dullness, Post-Acne Marks; the The Ordinary targets Acne, Oiliness.
Are the La Roche-Posay Mela B3 Dark Spot Serum and The Ordinary Niacinamide 10% + Zinc 1% dupes for each other?
They share 70% active-ingredient overlap based on published INCI lists, so one can stand in for the other on the actives that matter — chiefly Niacinamide. A dupe matches the hero actives, not the full sensory experience, so expect differences in texture, fragrance and exact concentrations.
Can I use the La Roche-Posay Mela B3 Dark Spot Serum and The Ordinary Niacinamide 10% + Zinc 1% together?
They both fill the serum slot in a routine, so you'd normally pick one rather than layer both. If you want to use both, treat one as your daytime option and the other for evening, and patch-test when introducing anything new.
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66% overlap

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