Vichy Mineral 89 Probiotic Serum: 30-Day Honest Test

30-Day Test
I skipped moisturizer for a month and only used this probiotic serum — here’s what happened week by week.
Expert Analysis · Honest Reviews · Real Results
1.🧪I ditched my moisturizer

For 30 days I slapped on nothing but Vichy‘s probiotic serum and walked out the door. No cream. No oil. Just this clear gel.

My skin usually drinks moisturizer like a dehydrated houseplant — by week three it stopped asking.

2.🔬What’s actually in the bottle

It’s $42 for 30ml. The claim that hooked me: “strengthens skin barrier in 30 days.” I’m a sucker for a challenge.

1

Probiotic fractions

Dead bacteria bits that supposedly talk to your skin’s microbiome — sounds gross, works weirdly well.

2

5% Vichy mineralizing water

Volcanic water with 15 minerals. Basically fancy tap water but it’s been cult-favorite for decades.

3

Glycerin + hyaluronic acid

The hydration duo. Nothing revolutionary, but they’re high enough on the ingredient list to actually matter.

3.📸Ingredients that pull weight

Three things do the heavy lifting here. The probiotic fractions are the star — they’re prebiotic food for your skin bacteria. The volcanic water is the supporting act. Glycerin is the workhorse nobody thanks.

  • Probiotic fractions: Feeds good bacteria, starves bad ones
  • Volcanic mineral water: 15 minerals that calm irritation fast
  • Glycerin: Holds water in your skin for 12+ hours
  • Hyaluronic acid: Sits on surface, plumps temporarily
4.📉Texture freaked me out

It’s a clear gel that turns into water the second it hits skin. Absorbs in 10 seconds flat. No stickiness — I checked by pressing my face to a pillow like a weirdo.

Week 2 my forehead got shiny in a way I hated. Week 3 that shine settled into actual glow. The unexpected part: my T-zone stopped overproducing oil by week 4. Less oily than when I used moisturizer. Weird.

💡

One Thing: Put it on damp skin — literally splash water, don’t dry, apply serum. Absorbs better and you use half the product.
5.💧What actually changed

Fine lines around my eyes looked the same — no miracle there. But my cheeks stopped flushing red after washing my face. Skin felt bouncier by week 3. The biggest change: no more tightness after cleansing. That alone is worth something.

Buy if
Your skin hates heavy creams but still feels tight — combo or oily types especially
⏭️

Skip if
You’re bone-dry and need rich moisturizer — this won’t cut it alone in winter
💰

Worth it?
Yes if you layer it under SPF. No if you expect anti-aging magic.
6.My honest take

It’s a solid daily hydration step for normal-to-oily skin that hates feeling heavy. Just don’t expect a facelift in a bottle.

7.8/10
Great base, not a miracle
🛍️

Where to Buy: Ulta or Vichy’s site — grab the travel size first if you’re skeptical like I was.