Side-by-side comparison

COSRX Centella Blemish Cream vs La Roche-Posay Effaclar Duo+

Both are treatments. 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
COSRX
Centella Blemish Cream
TreatmentMid-rangeMorning or evening
RednessAcnesensitive

A lightweight cream with centella, niacinamide and zinc oxide for redness and post-blemish healing. Mildly mattifying — works as a thin all-over layer on congested skin or as a spot treatment on active breakouts.

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La Roche-Posay
Effaclar Duo+
TreatmentMid-rangeMorning or evening
AcneOilinessRough TextureSensitive skin

A targeted anti-blemish moisturiser with niacinamide, salicylic acid, piroctone olamine and LHA (a gentler BHA derivative). Effective as a spot treatment or thin all-over layer for acne-prone skin.

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The verdict

Which should you choose?

Both sit in the Mid-range tier, so cost isn't the deciding factor here — choose on texture, finish and the supporting ingredients. The COSRX leans toward Redness, sensitive. The La Roche-Posay leans toward 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

COSRX — top of the list

  • Water~50–80%
  • Zinc Oxide~5–25%
  • Centella Asiat…~3–10%
  • Niacinamide~2–6%
  • Caprylic/Capri…~1.5–4%
  • Butylene Glycol~1–2%
  • Glycerin~1–2%
  • Propanediol~1–2%
  • Centella Asiat…~1–2%

La Roche-Posay — top of the list

  • Aqua / Water~50–80%
  • Glycerin~5–25%
  • Isononyl Isono…~3–10%
  • Zinc PCA~2–6%
  • Niacinamide~1.5–4%
  • Capryloyl Sali…~1–2%
  • Propylene Glycol~1–2%

● 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

COSRXLa Roche-Posay
CategoryTreatmentTreatment
Price tierMid-rangeMid-range
Best forRedness, Acne, sensitiveAcne, Oiliness, Rough Texture
Usage notesMorning or eveningMorning or evening
Active overlap70% — Niacinamide
Questions

Common questions

Is the COSRX Centella Blemish Cream or the La Roche-Posay Effaclar Duo+ better?
Neither is clearly better — they overlap 70% 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 COSRX Centella Blemish Cream and the La Roche-Posay Effaclar Duo+?
Both are treatments that share Niacinamide. Where they differ: the COSRX targets Redness, sensitive; the La Roche-Posay targets Oiliness, Rough Texture.
Are the COSRX Centella Blemish Cream and La Roche-Posay Effaclar Duo+ 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 COSRX Centella Blemish Cream and La Roche-Posay Effaclar Duo+ together?
They both fill the treatment 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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85% overlap

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