Side-by-side comparison

Good Molecules Discoloration Correcting Serum vs La Roche-Posay Mela B3 Dark Spot Serum

Both are serums. They share a 66% active-ingredient overlap, so the real decision is about price, texture and the supporting ingredients. Here's the side-by-side.

66%Active overlap
Good Molecules
Discoloration Correcting Serum
SerumBudgetMorning or evening
Dark SpotsDullness

A budget tranexamic acid serum with niacinamide — effective on post-inflammatory hyperpigmentation, especially the stubborn kind that vitamin C doesn't touch. Results take 8–12 weeks; patience required.

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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 verdict

Which should you choose?

On price, the Good Molecules Discoloration Correcting Serum 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. The La Roche-Posay leans toward Post-Acne Marks.

The overlap

What they share

At 66% active overlap, these are the ingredients doing comparable work in both formulas:

Niacinamide
The formulation

Ingredient stacks, side by side

Good Molecules — top of the list

  • Water~50–80%
  • Propanediol~5–25%
  • Niacinamide~3–10%
  • Glycerin~2–6%
  • Tranexamic Acid~1.5–4%
  • Sodium Acetyla…~1–2%
  • Butylene Glycol~1–2%
  • Sodium Hyaluro…~1–2%

La Roche-Posay — top of the list

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

Good MoleculesLa Roche-Posay
CategorySerumSerum
Price tierBudgetPremium
Best forDark Spots, DullnessDark Spots, Post-Acne Marks, Dullness
Usage notesMorning or eveningMorning or evening
Active overlap66% — Niacinamide
Questions

Common questions

Is the Good Molecules Discoloration Correcting Serum or the La Roche-Posay Mela B3 Dark Spot Serum better?
Neither is universally better — they share 66% active-ingredient overlap, so for the actives that drive results they're close. The Good Molecules Discoloration Correcting Serum 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 Good Molecules Discoloration Correcting Serum and the La Roche-Posay Mela B3 Dark Spot Serum?
Both are serums that share Niacinamide. Where they differ: they sit in different price tiers (Budget vs Premium); the La Roche-Posay targets Post-Acne Marks.
Are the Good Molecules Discoloration Correcting Serum and La Roche-Posay Mela B3 Dark Spot Serum dupes for each other?
They share 66% 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 Good Molecules Discoloration Correcting Serum and La Roche-Posay Mela B3 Dark Spot 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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70% overlap

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