Side-by-side comparison

La Roche-Posay Mela B3 Dark Spot Serum vs La Roche-Posay Retinol B3 Serum

Both are serums. They share a 77% active-ingredient overlap, so the real decision is about price, texture and the supporting ingredients. Here's the side-by-side.

77%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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La Roche-Posay
Retinol B3 Serum
SerumPremiumEvening only
Fine LinesRough TexturePhotoaging Prevention

A pure retinol plus retinyl-derivative serum buffered with niacinamide and glycerin for wrinkles and texture. A well-tolerated mid-strength retinol from a clinical brand; ramp up slowly and always follow with SPF.

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The verdict

Which should you choose?

Both sit in the Premium tier, so cost isn't the deciding factor here — choose on texture, finish and the supporting ingredients. On how you'd use them, the La Roche-Posay is flagged Morning or evening while the La Roche-Posay is flagged Evening only. The La Roche-Posay leans toward Dark Spots, Dullness, Post-Acne Marks. The La Roche-Posay leans toward Fine Lines, Photoaging Prevention, Rough Texture.

The overlap

What they share

At 77% active overlap, these are the ingredients doing comparable work in both formulas:

GlycerinNiacinamide
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%

La Roche-Posay — top of the list

  • Aqua~50–80%
  • Glycerin~5–25%
  • Dimethicone~3–10%
  • Niacinamide~2–6%
  • Retinol~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-PosayLa Roche-Posay
CategorySerumSerum
Price tierPremiumPremium
Best forDark Spots, Post-Acne Marks, DullnessFine Lines, Rough Texture, Photoaging Prevention
Usage notesMorning or eveningEvening only
Active overlap77% — Glycerin, Niacinamide
Questions

Common questions

Is the La Roche-Posay Mela B3 Dark Spot Serum or the La Roche-Posay Retinol B3 Serum better?
Neither is clearly better — they overlap 77% on active ingredients and sit in the same price tier. The difference comes down to texture, finish and the supporting ingredients, so the right choice depends on your skin type and preferences.
What's the difference between the La Roche-Posay Mela B3 Dark Spot Serum and the La Roche-Posay Retinol B3 Serum?
Both are serums that share Glycerin, Niacinamide. Where they differ: the La Roche-Posay is Morning or evening; the La Roche-Posay is Evening only; the La Roche-Posay targets Dark Spots, Dullness; the La Roche-Posay targets Fine Lines, Photoaging Prevention.
Are the La Roche-Posay Mela B3 Dark Spot Serum and La Roche-Posay Retinol B3 Serum dupes for each other?
They share 77% active-ingredient overlap based on published INCI lists, so one can stand in for the other on the actives that matter — chiefly Glycerin, 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 La Roche-Posay Retinol B3 Serum 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

Want a deeper, personalised read? Drop both products into the live comparison tool for an ingredient-by-ingredient breakdown tuned to your skin profile.

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