Side-by-side comparison

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

Both serums contain Niacinamide, but each adds something the other doesn't. Here's where they overlap and where they split.

1Shared hero active
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?

Both contain Niacinamide. Good Molecules Discoloration Correcting Serum adds Tranexamic Acid. La Roche-Posay Mela B3 Dark Spot Serum adds Melasyl. Pick the one whose extra matches what you're treating. La Roche-Posay Mela B3 Dark Spot Serum is the better fit for post-acne marks. On price, Good Molecules Discoloration Correcting Serum is the less expensive option (Budget versus Premium).

The overlap

What they share

This hero active appears in both formulas:

Niacinamide
The formulation

Ingredient stacks, side by side

Good Molecules Discoloration Correcting Serum — 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 Mela B3 Dark Spot Serum — 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 Molecules Discoloration Correcting SerumLa Roche-Posay Mela B3 Dark Spot Serum
CategorySerumSerum
Price tierBudgetPremium
Best forDark Spots, DullnessDark Spots, Post-Acne Marks, Dullness
Usage notesMorning or eveningMorning or evening
Shared hero activesNiacinamide
Questions

Common questions

Is the Good Molecules Discoloration Correcting Serum or the La Roche-Posay Mela B3 Dark Spot Serum better?
It depends on what you're treating. Both contain Niacinamide; Good Molecules Discoloration Correcting Serum adds Tranexamic Acid; La Roche-Posay Mela B3 Dark Spot Serum adds Melasyl.
What's the difference between the Good Molecules Discoloration Correcting Serum and the La Roche-Posay Mela B3 Dark Spot Serum?
Good Molecules Discoloration Correcting Serum's hero actives are Tranexamic Acid and Niacinamide. La Roche-Posay Mela B3 Dark Spot Serum's are Niacinamide, Melasyl and Glycerin. They also sit in different price tiers (Budget versus Premium).
Are the Good Molecules Discoloration Correcting Serum and La Roche-Posay Mela B3 Dark Spot Serum dupes for each other?
Partly. They share Niacinamide, but Good Molecules Discoloration Correcting Serum's Tranexamic Acid and La Roche-Posay Mela B3 Dark Spot Serum's Melasyl aren't in the other, so they aren't full substitutes.
Can I use the Good Molecules Discoloration Correcting Serum and La Roche-Posay Mela B3 Dark Spot Serum together?
Usually, yes. Apply the thinner texture first, then the thicker one, and patch-test when introducing anything new.
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1 shared hero active

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