Side-by-side comparison

La Roche-Posay Hyalu B5 Hyaluronic Acid Serum vs Vichy Minéral 89 Hyaluronic Acid Booster

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
Hyalu B5 Hyaluronic Acid Serum
SerumMid-rangeMorning or evening
DrynessDamaged Barrier

Two molecular weights of hyaluronic acid with panthenol and madecassoside. Designed for visible fine-line plumping on dehydrated skin — works best on damp skin sealed with moisturiser. Fragrance-free.

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Vichy
Minéral 89 Hyaluronic Acid Booster
SerumMid-rangeMorning or evening
DrynessDamaged BarrierDullnessSensitive skin

89% Vichy mineralizing thermal water with hyaluronic acid in a light gel-serum. Not a heavy-hitting active product — it's a first-step hydrator. Comfortable under actives, useful for anyone finding fuller HA serums too tacky.

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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 Vichy leans toward Dullness.

The overlap

What they share

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

Hyaluronic Acid
The formulation

Ingredient stacks, side by side

La Roche-Posay — top of the list

  • Aqua / Water~50–80%
  • Glycerin~5–25%
  • Propanediol~3–10%
  • Sodium Hyaluro…~2–6%
  • Hyaluronic Acid~1.5–4%
  • Panthenol~1–2%
  • Madecassoside~1–2%
  • Tromethamine~1–2%
  • Propylene Glycol~1–2%

Vichy — top of the list

  • Vichy Minerali…~50–80%
  • Glycerin~5–25%
  • Propanediol~3–10%
  • PEG-6 Caprylic…~2–6%
  • Sodium Hyaluro…~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-PosayVichy
CategorySerumSerum
Price tierMid-rangeMid-range
Best forDryness, Damaged BarrierDryness, Damaged Barrier, Dullness
Usage notesMorning or eveningMorning or evening
Active overlap70% — Hyaluronic Acid
Questions

Common questions

Is the La Roche-Posay Hyalu B5 Hyaluronic Acid Serum or the Vichy Minéral 89 Hyaluronic Acid Booster 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 La Roche-Posay Hyalu B5 Hyaluronic Acid Serum and the Vichy Minéral 89 Hyaluronic Acid Booster?
Both are serums that share Hyaluronic Acid. Where they differ: the Vichy targets Dullness.
Are the La Roche-Posay Hyalu B5 Hyaluronic Acid Serum and Vichy Minéral 89 Hyaluronic Acid Booster 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 Hyaluronic Acid. 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 Hyalu B5 Hyaluronic Acid Serum and Vichy Minéral 89 Hyaluronic Acid Booster 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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77% overlap

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