I Was 50 When I Finally Understood the Kerastase Scalp Range

By Milajne, Founder & President, Zennkai  —  Est. 1984, Metro Vancouver

I've carried Kérastase since before some of our current customers were born. I've sold thousands of units across our six Metro Vancouver locations. I've sat through brand training after brand training. And I'm telling you honestly — it wasn't until I was around fifty that I actually understood the difference between every scalp serum in their range.

 

Not because I wasn't paying attention. Because the confusion is real, and nobody explains it plainly.

 

There are six Kérastase scalp serums. They look similar. They're all leave-in. They all sit in the same section of the shelf. And they solve completely different problems — in some cases, problems that people mistake for each other every single day.

 

This is the guide I wish I'd had at thirty-five. It's also the guide I hand to every one of our staff when they join us, because getting this wrong is expensive for the client and frustrating for everyone.

"The most important question in professional scalp care isn't which product to buy. It's what is actually causing the problem."

The Confusion Nobody Talks About

Here's the thing most people — including most beauty advisors — get wrong: hair fall from breakage is not the same as hair loss from the follicle.

 

When your hair breaks during brushing, it falls out. You see it in the brush, on the pillow, in the shower drain. It feels like hair loss. But the follicle is intact — the hair just snapped before it reached the end of its growth cycle. The solution for this is a strand-strengthening product that reduces breakage.

 

When you have actual follicle-level hair loss, the hair completes its cycle and sheds — but it doesn't grow back at the same rate, or at all. You see it as a widening part, a thinning crown, less density overall. The solution for this is a follicle-targeted treatment that works at the scalp level, not the strand level.

 

Kérastase has products for both. They are not interchangeable. And because the packaging looks similar and the shelf placement is similar, people routinely reach for the wrong one. I did too, for longer than I'd like to admit.

"Hair fall from breakage and hair loss from the follicle feel the same. They are not the same. The products that fix them are different."

The Six Serums — What They Actually Do

Here's every Kérastase scalp serum, mapped to the concern it actually addresses, the active that does the work, and who it is — and isn't — for.

Kerastase Genesis Anti Hair-Fall Fortifying Serum - Zennkai

Kerastase Genesis Anti-Breakage Fortifying Serum

Range:  Genesis — for weakened hair prone to falling due to breakage

 

The concern it solves:  Hair fall caused by breakage — hair that snaps during brushing, styling, or handling

 

Active:  Aminexil + Ginger Root + Caffeine

 

What the active does:  Aminexil works at the interface between the hair fiber and the scalp to prevent premature hardening of collagen around the follicle — it anchors the fiber so it doesn't snap. Ginger and caffeine stimulate microcirculation, feeding the root. The result is a strand that is less likely to break before it completes its natural cycle.

 

Format & application:  Lightweight serum. Pipette applicator. Apply 4 doses to dry or towel-dried scalp daily, section by section. Massage in. Leave-in — do not rinse.

 

Frequency:  Daily. Minimum 6 weeks to see full results.

 

NOT for:  Follicle-level thinning or density loss — if you are losing hair because follicles are miniaturizing or not regrowing, Genesis is not the right product. You need Stimuliste or Cure Densifique.

 

Genesis is the one most people reach for first — and often the right call for clients managing breakage from heat styling, chemical services, or mechanical damage. In Vancouver's humidity cycles, hair that swells and dries repeatedly is more prone to mid-shaft breakage. Genesis is a good daily anchor for this.
Kerastase Specifique Daily Scalp Treatment for Thinning Hair - Zennkai

Kerastase Specifique Daily Scalp Treatment for Thinning Hair

Range:  Spécifique — for hair loss and thinning at the follicle level

 

The concern it solves:  Actual hair loss — density loss, thinning crown, widening part, follicle-level shedding

 

Active:  Aminexil 15,000 PPM + Rhamnose + Arginine + Glycolipid GL + Vitamin PP

 

What the active does:  This is the highest-concentration Aminexil product in the Kérastase range — 15,000 PPM — targeting the perifollicular fibrosis mechanism directly. Rhamnose (a vegetable sugar with anti-aging properties) stimulates fibroblast activity in the scalp to improve scalp quality at the tissue level. Arginine supports blood flow and hair fiber substance. Vitamin PP (Niacinamide) activates microcirculation.

 

Format & application:  Lightweight spray. Apply approximately 10 pumps to dry or towel-dried roots. Distribute evenly. Leave-in.

 

Frequency:  Daily. This is a clinical-grade treatment — consistency is what delivers results.

 

NOT for:  Breakage-related fall without follicle involvement — Stimuliste is specifically for follicle-level thinning. For pure breakage, Genesis is more targeted. For GLP-1 or hormonal shedding, use alongside Genesis.

 

Stimuliste is what I should have been reaching for first on clients describing a widening part or a thinning crown — not Genesis. The Aminexil concentration is significantly higher, and the Rhamnose component addresses scalp tissue quality in a way that Genesis doesn't. If a client is on GLP-1 medication or navigating perimenopause and describing acute density loss, Stimuliste is the entry point.
Kerastase Specifique Potentialiste Universal Defense Serum - Zennkai

Kerastase Specifique Potentialiste Universal Defense Serum

Range:  Spécifique — for unbalanced scalps across all scalp types (dry, oily, sensitive, normal)

 

The concern it solves:  Scalp imbalance caused by environmental and lifestyle aggressors — heating tools, hard water, stress, pollution, and exercise disrupt the scalp's microbiome and break down its protective barrier. The result is a scalp that feels uncomfortable, reactive, dry, or sensitized, which over time compromises the health of the hair at the root.

 

Active:  Bifidus Prebiotic Fractions + Vitamin C Derivative (Ascorbyl Glucoside)

 

What the active does:  The Bifidus Prebiotic Fractions work at the level of the scalp microbiome — nourishing the good bacteria that maintain the scalp's protective barrier and helping it recover faster after disruption. The Vitamin C derivative (a stabilized, oxidation-resistant form) neutralizes the daily oxidative damage from pollution and environmental stressors that degrade scalp health at the root. Together, they restore balance rather than targeting one specific scalp condition — which is what makes this product genuinely universal.

 

Format & application:  Fast-absorbing gel-serum. Pipette applicator. Apply 3 doses to dry or towel-dried scalp, section by section. Massage in. Leave-in — do not rinse. Note: the serum may turn yellow over time due to the Vitamin C — this is normal and does not affect performance. Can be refrigerated.

 

Frequency:  Daily for the first 3 weeks, then transition to 3 times per week for maintenance.

 

NOT for:  Clients with a specific, diagnosable scalp condition — if the issue is significant dandruff, seborrheic dermatitis, or active folliculitis, Potentialiste is not a treatment. It is a defense and rebalancing serum, not a corrective one. Clients with hair fall due to breakage should be directed to Genesis; those with follicle-level thinning or density loss need Stimuliste or Cure Densifique.

 

The ultimate scalp serum to improve the overall health.
Kerastase Densifique Cure Densite Densifying Treatment - Zennkai
Kerastase Densifique Cure Densite Densifying Treatment - Zennkai
Kerastase Densifique Cure Densite Densifying Treatment - Zennkai
Kerastase Densifique Cure Densite Densifying Treatment - Zennkai

Kerastase Densifique Cure Densite Densifying Treatment

Range:  Densifique — intensive density treatment for visibly thinning hair

 

The concern it solves:  Visibly thinning hair requiring an intensive, time-bound clinical intervention — more than daily maintenance, less than medical treatment

 

Active:  Stemoxydine® + Complex Glycan + Vitamins B3, B5 & B6 + Texturizing Polymer

 

What the active does:  Same Stemoxydine base as Serum Jeunesse, but in a higher-concentration ampoule format with a 3-month daily protocol. Clinical data: 1,000+ new hairs revealed after 3 months (clinical test, 101 subjects vs. placebo, daily application). Complex Glycan restores thickness appearance. Vitamins B3, B5, B6 boost follicular activity directly.

 

Format & application:  One ampoule per day for 90 days. Snap top, clip on comb applicator, apply to scalp at roots — morning or evening, dry or towel-dried hair. Leave-in. Fast-drying.

 

Frequency:  Daily for exactly 3 months. Can be followed with Serum Jeunesse as ongoing maintenance.

 

NOT for:  Clients who won't commit to 90 consecutive days — this is a program, not a product. The clinical data is built on 3 months of daily use. Skipping is fine occasionally, but inconsistency significantly undermines results. Set the expectation before recommending.

 

Cure Densifique is the most clinical thing in this entire range. The ampoule format, the 90-day protocol, the clinical trial data — this is the product to reach for when a client is genuinely distressed about visible thinning and needs a structured approach. I always tell clients: commit to 90 days, track your density with photos, then reassess. The results are real when the protocol is followed.
Kerastase Initialiste Advanced Scalp & Hair Concentrate - Zennkai

Kerastase Initialiste Advanced Scalp & Hair Concentrate

Range:  Densifique / universal — advanced fiber-strengthening serum

 

The concern it solves:  Weak, fragile hair prone to breakage — hair that lacks strength, shine, and uniformity regardless of the cause

 

Active:  Gluco Peptide + Wheat Protein + Native Plant Cells

 

What the active does:  Initialiste works primarily on the hair fiber rather than the scalp. Gluco Peptide strengthens the fiber from the inside, restoring uniformity and elasticity. Wheat Protein adds coating strength and shine. Native Plant Cells support scalp cell quality. It's a generalist strengthening serum — the one that works for almost any concern as a foundational product.

 

Format & application:  Pipette applicator. Apply directly to scalp on cleansed, towel-dried hair. 2 pipettes for fine hair, 4 for thick. Work from front to back of head, massage in. Leave-in.

 

Frequency:  Minimum 3 times per week. Can be used daily.

 

NOT for:  Clients with a specific, targeted concern (active thinning, follicle-level loss, age-related density decline) — Initialiste is a generalist. It works beautifully alongside Genesis, Stimuliste, or Serum Jeunesse, but it doesn't replace any of them for targeted clinical concerns.

 

Initialiste is the serum I recommend when I genuinely am not sure yet what's driving a client's concern — or when they want one great foundational product while we figure out the rest. It's also the best entry point for younger clients without a specific concern who simply want stronger, shinier hair. It's not a compromise; it's a different use case.
Kerastase Symbiose Serum Night Nuit - Zennkai

Kerastase Symbiose Serum Night Nuit

Range:  Symbiose — for dandruff and scalp sensitivity

 

The concern it solves:  Dandruff symptoms — flaking, itching, irritation, scalp discomfort — including persistent dandruff that doesn't respond to regular anti-dandruff shampoos

 

Active:  Salicylic Acid + Pyrithione Zinc

 

What the active does:  Salicylic Acid is a keratolytic — it gently breaks down and removes the scale and buildup on the scalp surface that dandruff produces. Pyrithione Zinc is an anti-fungal and anti-bacterial active that addresses the Malassezia yeast overgrowth that causes most persistent dandruff. The night application is deliberate: scalp renewal rate is faster during sleep, so the serum works with the scalp's natural repair cycle.

 

Format & application:  Apply to affected areas nightly or as directed. Leave-in overnight. Use alongside Symbiose Bain Crème Antipelliculaire shampoo for full clinical efficacy — the clinical data (90% reduction in dandruff symptoms, 78% reduction in visible flakes after 24 days) is based on the system, not the serum alone.

 

Frequency:  Nightly until symptoms resolve, then as needed for maintenance.

 

NOT for:  General scalp health without dandruff — Salicylic Acid and Pyrithione Zinc are active pharmaceutical ingredients. Don't use this serum on a non-dandruff scalp as a preventive. It's clinical — use it when the problem is present.

 

Symbiose is the one that sits separately from the rest of this range in my mind — it's solving a fundamentally different problem. Dandruff is a microbiome issue, and the Symbiose Night Serum is a targeted pharmaceutical response. The reason I include it here is that clients frequently mistake scalp flaking from dryness for dandruff — and they'll reach for a dandruff serum when what they actually need is a hydrating scalp treatment. If the flakes are dry and powdery, that's likely dryness. If they're oily, larger, and coming with redness or itching, that's dandruff.

One important note: these serums are not mutually exclusive. Genesis and Stimuliste are often used together for clients managing both breakage and follicle-level loss simultaneously. Serum Jeunesse and Genesis pair well for the perimenopause client who has both age-related thinning and mechanical fragility. The starting point is the most acute concern — you can layer from there.

"When in doubt, come talk to us. This is a 10-minute conversation in any of our six locations — and getting it right on the first try saves time and money."

A Note on Where You Buy

Kérastase is a salon-exclusive brand. At Zennkai, we are an authorized Canadian retailer — which means our stock comes directly from Kérastase's Canadian distributor, and the formulations are identical to what your salon carries.

 

Products sold through third-party marketplaces cannot be verified for formulation integrity. Kérastase's clinical actives — particularly Aminexil and Stemoxydine — are concentration-sensitive. A product that has been improperly stored, reformulated for mass retail, or sourced outside authorized channels may not perform as the clinical data suggests.

 

All Kérastase purchases at Zennkai earn Beauty with Benefits loyalty points. We ship across Canada from our Metro Vancouver locations, and our staff across all six stores are trained on the full Kérastase range — including, yes, exactly the decision tree above.

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Frequently Asked Questions

What is the difference between Kérastase Genesis and Stimuliste?

Genesis Serum Fortifiant targets hair fall caused by breakage — it strengthens the hair fiber so it doesn't snap before the end of its growth cycle. Stimuliste targets actual follicle-level hair loss — it contains Aminexil at 15,000 PPM to prevent perifollicular fibrosis and Rhamnose to improve scalp tissue quality. If you see hair in your brush but your density looks normal, Genesis is likely your product. If you see thinning, a widening part, or reduced density, Stimuliste is the right choice.

Which Kérastase serum is best for hair loss?

It depends on the cause. For hair loss due to breakage: Genesis Serum Fortifiant. For follicle-level thinning: Spray Stimuliste. For age-related density decline (hair that has become finer and less voluminous over time): Serum Jeunesse or Cure Densifique for a 3-month intensive. For GLP-1 or hormonal shedding: Stimuliste as the primary treatment, Genesis alongside. At Zennkai, our staff can help you identify which category applies — come into any of our six Metro Vancouver locations for a complimentary consultation.

What does Aminexil do in Kérastase serums?

Aminexil is a molecule developed to prevent perifollicular fibrosis — the premature hardening of collagen around the hair follicle that can shorten the hair's life cycle and accelerate shedding. It works by keeping the collagen structure around the follicle flexible, which allows the hair to remain anchored longer. Both Genesis and Stimuliste contain Aminexil. Stimuliste contains it at 15,000 PPM — the higher clinical concentration, designed specifically for follicle-level hair loss.

What does Stemoxydine do and which Kérastase products contain it?

Stemoxydine mimics the optimal cellular environment inside the hair follicle, stimulating the interaction between stem cells and revitalizing dormant follicles. It is specifically designed for age-related density decline — the type of thinning that occurs gradually as follicles miniaturize over time, rather than acute shedding events. Stemoxydine is the primary active in Kérastase Densifique Serum Jeunesse and Cure Densifique. Both are available at Zennkai.

Can I use Kérastase Genesis and Stimuliste at the same time?

Yes — they address different aspects of the same concern and work well together. Genesis reduces the breakage rate of the existing hair strand. Stimuliste works at the follicle level to reduce actual hair loss and support regrowth. For clients managing GLP-1 hair loss, perimenopause-related shedding, or combined breakage and thinning, using both is a common professional approach. Apply Stimuliste first on dry scalp, follow with Genesis.

What is the Kérastase Symbiose Night Serum for?

The Symbiose Serum Nuit Antipelliculaire is a clinical anti-dandruff treatment. It contains Salicylic Acid (to break down scalp scale and buildup) and Pyrithione Zinc (to address the Malassezia yeast overgrowth that causes persistent dandruff). It is applied nightly and left in while you sleep. It is designed for actual dandruff — oily flakes, scalp redness, itching — not dry scalp flaking, which is a different concern requiring different treatment.

Where can I buy Kérastase scalp serums in Vancouver?

All six Kérastase scalp serums are available at Zennkai's six Metro Vancouver locations: South Granville, Metrotown (Burnaby), Willowbrook (Langley), Coquitlam Centre, Guildford Town Centre (Surrey), and Meadowtown Centre (Pitt Meadows). The full range is also available online at zennkai.com with Canada-wide shipping. Zennkai is an authorized Kérastase retailer — all purchases earn Beauty with Benefits loyalty points.