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Best Seller

4.9 (1,364 Verified Reviews)

The Hair Multiplier

Lightweight Growth Serum

Our 15× best-seller, powered by Swiss 7-Stem Concentrate®, a blend of 7 rare alpine botanicals that mirror your scalp's natural biology.

Thickens hair by up to 94%*

Up to 3" of growth in 90 days*

No hormone disruptors

Absorbs instantly,

no residue

The Hair Multiplier® is intentionally produced in small, seasonal batches. Your order reserves the next batch.

March Delivery

SOLD OUT

April Delivery

SOLD OUT

May Delivery - Spring Bloom

70% SOLD

1 Month Supply

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"Our research shows best results come from uninterrupted daily application for 3 months. Hair follicles operate on natural 3 month growth cycles and require consistent support throughout the full cycle to produce thicker, fuller strands."

Sophie L. — Director of Research

Clinical Formulations & Hair Biology Division

120 Day Money

Back Guarantee

Made

in Switzerland

Dedicated Hair

Concierge Support

The Hair Multiplier® was designed for women aiming to grow longer, thicker, fuller hair without the weight of heavy oils.

Its ingredient composition is most effective for those with:

  1. Fine or thinning hair that lacks volume or density.

  2. Hair growth that has slowed or plateaued.

  3. Hair that has breakage before reaching its desired length.

For best results, we recommend storing The Hair Multiplier® in the refrigerator between uses. Cooler temperatures help preserve the integrity of the formulation and extend freshness while delivering a cooling sensation that soothes the scalp.

We call this the Cold Application Method. It is completely optional, yet deeply loved by our community.

Application:

  1. Begin on a dry or slightly damp scalp.

  2. Press the pump until the dropper is fully filled with serum. Use no more than two full droppers (2mL) per application.

  3. Apply directly to the scalp, focusing on areas of concern.

  4. Gently massage with fingertips to improve absorption.

  5. Leave in and allow to dry naturally before styling as usual. Do not rinse.

  6. Keep serum refrigerated between uses to help preserve potency.

For best results, we suggest applying fresh after a warm shower, when the hair cuticle is open. This is when the scalp is the most receptive to nourishment.

Results continue to develop over time. That's why all purchases are covered by our 120-day money-back guarantee. If you don’t love your results, we’ll gladly provide a full refund.

The Hair Multiplier

2 Months + Get 1 FREE

add to BAG

$188

TESTIMONIALS

What Happens When

You Stay Consistent?

These women saw thicker, healthier growth from daily use. Proof of what’s possible when consistency meets the right routine.

Before

Month 0

After

Month 3

5.0 / 5.0

"I've been a fine hair girl my whole life, this added real thickness"

"Heard someone on a podcast talk about this so I figured I'd try and see if this is the real deal. The first pic is from January 10th, and the second is April 28th. Ladies... this thing is liquid gold. I've been fine haired my whole life and this added real thickness to my hair. The progress has been unbelievable. Ordered two more for my mom and my sister."

"Heard someone on a podcast talk about this so I figured I'd try and see if this is the real deal. The first pic is from January 10th, and the second is April 28th. Ladies ... this thing is liquid gold. I've been fine haired my whole life and this added real thickness to my hair. The progress has been unbelievable. Ordered two more for my mom and my sister."

Results: Fuller middle part, thicker hair

— Ashley T. | 🇺🇸 Verified Customer | 3 Pack

Before

Month 0

After

Month 2.5

5.0 / 5.0

"I'm so happy I didn't quit...my hair is noticeably thicker"

"It actually works!!! This is the first time in my life I am writing a review about something because THIS WORKS. Not sponsored and not a paid review. These are around 75 days apart. My sides have nearly filled in plus my hair is noticeably thicker when I tie it up or run my fingers through it. Consistency is KEY, about 80% of the new hairs you're seeing didn't even appear until early month 3. Soo happy I didn't quit."

"It actually works!!! This is the first time in my life I am writing a review about something because THIS WORKS. Not sponsored and not a paid review. These are around 75 days apart. My sides have nearly filled in plus my hair is noticeably thicker when I tie it up or run my fingers through it. Consistency is KEY, about 80% of the new hairs you're seeing didn't even appear until early month 3. So happy I didn't quit."

Results: Thicker hair, improved hair density

— Elena M. | 🇨🇭 Verified Customer | 3 Pack

Before

Month 0

After

Month 3

5.0 / 5.0

"I could honestly cry... my confidence has skyrocketed"

"I was shedding around the middle area of my head for unknown reasons. Stress? bad eating habits? Not sure what it was. I work as a nurse so i'm always on night shift. After seeing months of Le Jardin ads on Instagram, I thought what the hell, i'll try it. Pics are EXACTLY 3 months apart. I could honestly cry, my confidence has skyrocketed and I can finally take these extensions out. 10/10 worth the investment."

"I was shedding around the middle area of my head for unknown reasons. Stress? bad eating habits? Not sure what it was. I work as a nurse so i'm always on night shift. After seeing months of Le Jardin ads on Instagram, I thought what the hell, i'll try it. Pics are EXACTLY 3 months apart. I could honestly cry, my confidence has skyrocketed and I can finally take these extensions out. 10/10 worth the investment."

Results: Stopped shedding, healthier hair growth

— Leah H. | 🇸🇪 Verified Customer | 3 Pack

BACKED BY SCIENCE

Following 3 Months of

Consistent Use

+94%

Reported visibly

thicker, fuller hair by week 6*

+90%

Saw a noticeable increase in length and hair softness by month three.*

Noticeable improvements reported in the first

10 weeks

*Based on a self-reported 12-week consumer-use survey of 80 participants using The Hair Multiplier twice daily.

Swiss 7-Stem Concentrate®

The result of years of research into alpine botany and the biology of human hair, our proprietary complex blends seven rare alpine botanicals, scientifically proven to support hair health and encourage natural growth.

Origin

The principal botanical, the Matterhorn Edelweiss Flower, blooms on the rocky slopes of the Matterhorn mountain. For centuries, the peak stood untouched, a fatal pursuit for mountaineers. Where human endurance falters, the Edelweiss Flower endures. To survive, it developed exceptional self-repair and protection systems, producing high concentrations of antioxidants and phytonutrients.

Function

Edelweiss Flower is scientifically proven to sustain the hair’s natural growth cycle by energizing follicle cells and preserving collagen integrity. Naturally abundant in antioxidants and vitamins A, C, and E, it protects the scalp from UV and environmental stress while reinforcing follicle structure to reduce breakage and support lasting growth.

Effect

The hair’s natural growth cycle is restored and new growth is shielded from external stressors, revealing stronger, healthier, and visibly longer hair.

Amaranth Seed Extract

One of the world’s oldest cultivated grains, Amaranth Seed Extract combines ancient botanical wisdom with modern bioactive science to support strand integrity and improve hair health for continuous growth.

Origin

Known as the Velvet Flower, Amaranth Seed Extract was rediscovered in the 1880s after five centuries of obscurity. Amaranth was once a sacred staple of Aztec and Incan civilizations before its cultivation spread across Asia, Africa, and Europe. Today, it is valued worldwide for its rich bioactive profile and deeply restorative properties.

Function

Amaranth Seed’s lightweight molecular structure penetrates deeply without irritation, replenishing the hair’s natural protein and repairing weakened strands. Rich in squalene and essential fatty acids, it locks in moisture, strengthening scalp elasticity and enhancing nutrient absorption to reduce dryness and breakage.

Effect

Hair appears visibly healthier and fuller with the strength and vitality to support new, continuous natural growth.

Bio-Fermented Hyaluronic

Acid

Capable of holding 1,000 times it's own weight in water, hyaluronic acid binds moisture to the skin and hair, improving elasticity and scalp health while making hair visibly thicker and fuller.

Origin

Naturally bio-fermented in Switzerland using plant-based substrates before being purified at low temperatures to preserve molecular integrity. This process allows for precise control of molecular weight, creating a lower-weight HA that penetrates deeper to enhance hydration and improve absorption.

Function

Long, chain-like molecules bind water and bioactive nutrients to hyaluronic acid, allowing deep absorption into the scalp’s protective barrier. This ensures every element of the formula is activated while hydrating the scalp to sooth irritation, prevent follicle damage, and plump strands.

Effect

Restores the scalp’s natural growth environment by maintaining a healthy barrier and strengthens existing strands so hair appears thicker and fuller.

Alpine-Purified Caffeine

A natural growth stimulant, caffeine extract energizes follicles and extends the hair’s natural growth phase.

Origin

Harvested from organic green coffee plants grown in high-altitude microclimates. These alpine environments slow the ripening process and enhance drainage, producing higher-quality beans with greater concentrations of bioactive compounds.

Function

Caffeine promotes hair growth by improving scalp health and stimulating follicle activity. It boosts blood circulation to deliver oxygen and nutrients essential for growth, while antioxidant properties protect against environmental damage. By blocking DHT, the hormone responsible for follicle shrinkage, and supporting ATP production and IGF-1 expression, it ensures hair remains in its active growth phase longer.

Effect

Caffeine extract helps stimulate natural growth, resulting in visibly longer, stronger hair that’s protected from and more resilient to damage.

INGREDIENTS

The World's Purest

Natural Ecosystem

Born in the world’s most remote alpine environments, these rare botanicals endure where few species can.

Key Function

Reduces shedding and promotes visibly thicker hair

Key Function

Visible length retention and volume over time

Key Function

Improves scalp hydration, supports healthy growth cycles

Key Function

Extends hair growth phase and inhibits DHT in scalp

Aqua (Water), Glycerin, Caffeine, Erythritol, Niacinamide (Vitamin B3), Potassium Sorbate, Lactic Acid, Sodium Benzoate (Gentle Preservative), Amaranthus Caudatus Seed Extract, Acetyl Tyrosine, Sodium Hyaluronate (Hyaluronic Acid), Zea Mays Starch, Chlorella Vulgaris/Lupinus Albus Protein Ferment, Leontopodium Alpinum Extract (Swiss Edelweiss), Gluconolactone, Glycine, Larix Europaea Wood Extract, Sodium Metabisulfite, Phenethyl Alcohol (Plant-Derived Preservative), Benzyl Alcohol (Non-Drying Natural Preservative), Phenoxyethanol, Caprylyl Glycol, Citric Acid (pH Adjuster), Camellia Sinensis (Green Tea) Leaf Extract, Zinc Chloride, Calcium Gluconate, Tocopherol (Vitamin E)

No Sulfates (SLS/SLES)

No Parabens

No Phthalates

No Synthetic Fragrances

No Dyes

No Harsh Preservatives

No Animal Testing

INGREDIENTS

Made to Mirror Your

Natural Biology

Ingredients your body recognizes—not resists.

No hormone disruptors or harsh additives

Balanced pH

levels mirror scalp's natural environment

Top 1% EWG

clean ingredients score.*

*Based on data obtained from the environmental working group Skin Deep® ingredients scoring tool, Jan 2025.

TRANSFORMATION TIMELINE

Your 3 Month

Hair Transformation

One minute. Twice a day.

Visible renewal in as little as three months

Month 1

Reset & Rebalance

From the very first application, The Hair Multiplier® sinks deep into the scalp to restore the environment your follicles depend on to grow. Powered by Swiss 7-Stem Concentrate®, the scalp is gently rebalanced and cleared of buildup that weakens developing strands. The scalp feels calmer, cleaner, and more receptive to growth. This is the foundation phase, the quiet work that makes everything else possible. We recommend taking a photo now, so you can easily compare the growth.

Month 2

New Density Begins

With the scalp now balanced, follicles begin functioning at a higher capacity. Swiss 7-Stem Concentrate® helps strengthen the follicle structure itself, improving how keratin is formed and how strands anchor into the scalp. Fine, fragile hairs begin to thicken, baby growth becomes more noticeable, and your hair starts to feel fuller, stronger, and more resilient to daily stress. This is the phase where density quietly returns.

Month 3

Extended Growth & Length

By the third month, your follicles are no longer just growing. They are staying in their active growth phase longer. Consistent nourishment from Swiss 7-Stem Concentrate® helps prolong the anagen growth cycle. New growth fills in sparse areas, and length becomes visibly more noticeable, leaving hair fuller at the roots, longer through the ends, and stronger from scalp to tip. This is when your transformation becomes unmistakable, not by forcing growth, but by restoring the conditions your hair was always designed to thrive in.

TRY THE HAIR MULTIPLIER

120 Day Money-Back Guarantee

Commonly Asked

Questions

Yes. Apply the serum directly to your scalp twice daily, focusing on areas where you’d like to encourage new growth.

Extensions can sometimes place extra tension on fragile strands, so we recommend opting for gentle, non-damaging methods while your hair strengthens. Remember, new hair is at its most delicate stage while it’s growing, treat it with care.

No. The Hair Multiplier® formulation was specifically refined to a lightweight molecular consistency that absorbs effortlessly into the scalp, ensuring you receive the full benefits of the formula while leaving hair completely grease-free.

Yes. The Hair Multiplier® is ideal for those with compromised hair. Formulated with pure alpine botanicals, selected for their strengthening and restorative properties, its bioactive ingredients repair weakened strands, revitalize dormant follicles, and restore a healthy growth environment, leading to reduced breakage and revealing visibly healthier hair.

The Hair Multiplier® is fragrance-free and contains no synthetic perfumes to prevent scalp irritation.

Some users may notice a very light increase in shedding when first introducing The Hair Multiplier®. This typically involves a small portion of resting hairs, usually around 5% or less, completing their natural renewal cycle so new, stronger strands can begin forming.

At the same time, the remaining 95%+ of your hair continues to strengthen, thicken, and remain in its active growth phase. Think of this as a gentle reset of the growth cycle. The hairs that release are naturally replaced with healthier, more resilient strands over time.

The Hair Multiplier® is a topical, leave-in scalp serum formulated with our Swiss 7-Stem Concentrate® and 95% naturally derived ingredients, designed to work in harmony with the scalp’s natural rhythm.

It does not contain retinoids, prostaglandin analogues, prescription actives, minoxidil, synthetic fragrance, essential oils, or hormone-disrupting ingredients.

Pregnancy and breastfeeding naturally heighten skin sensitivity and can change how the body absorbs topical products. Because we have not conducted pregnancy-specific clinical trials, we recommend speaking with your doctor before use to determine what feels right for you.

Some expecting and nursing customers choose to pause during pregnancy, while others continue their routine without issue.

Your comfort and confidence always come first.

120 Day

Money-Back Guarantee

Results continue to develop over time. That's why all purchases are covered by our 120-day money-back guarantee. If you don’t love your results, we’ll gladly provide a full refund.

How to Apply

The Hair Multiplier

Apply directly to dry or damp scalp, focusing on problem areas.

Gently massage into the scalp. Leave in and allow to dry naturally and style as usual.

4.9
Rated 4.9 out of 5 stars
Based on 1,364 reviews
Total 5 star reviews: 1.2k Total 4 star reviews: 141 Total 3 star reviews: 6 Total 2 star reviews: 4 Total 1 star reviews: 7
Write a Review (Opens in a new window)
1,364 reviews
  • Hannah
    Verified Buyer
    Reviewing
    The Hair Multiplier
    I recommend this product
    Age 25-34
    What is your hair length? Short
    What is your hair type? Straight
    What are your hair concerns? Want longer hair
    How long have you been using it for? 1 month
    Rated 4 out of 5 stars
    1 week ago
    Love the Experience—Still Testing the Results

    I’ve been using the Hair Multiplier serum for about a month now, and overall I’ve had a really positive experience so far.

    I ordered in January, and it took a little over a month to ship (it went out mid-February). While the delay wasn’t ideal, customer service was great—they stayed in touch the whole time and even offered discounts for future purchases, which I really appreciated.

    As for the serum itself, I really like it. The texture is lightweight and non-greasy, so I can use it anytime—not just on wash days—which is a big plus. The packaging is also beautiful and feels very high-end. The pump is easy to use, although it is hard to get the last bit of product out of the bottle, and it can be a little drippy if you’re not careful with how you apply it.

    I’m still figuring out how much to use, since I went through my first bottle faster than expected (which surprised me because I usually make products last).

    In terms of results, it’s still early, but I have noticed some small “baby hairs” around my hairline that I don’t think were there before, which feels promising.

    Overall, based on my experience so far—the product itself and the customer service—I would recommend it. I’m just still waiting to see the longer-term results.

    Was this helpful?
  • Traci G.
    Verified Buyer
    Reviewing
    The Hair Multiplier
    I recommend this product
    Age 35-44
    What is your hair length? Long
    What is your hair type? Straight
    What are your hair concerns? Hair loss or shedding
    How long have you been using it for? 1 month
    What improvements have you noticed? Less shedding, Hair is thicker / fuller
    Rated 5 out of 5 stars
    1 week ago
    This really works!

    Baby hairs galore! Seriously, this stuff works within just a few days/weeks. I'm only one month into use and the baby hairs are going wild. My only complaint is that I am going through the product quite quickly since I'm using twice a day. I also have some issues with how delayed the shipping has been. It took over a month for my first order to ship and now I have my first subscription ordered and it still hasn't gone out after almost a week. So that seems to be an ongoing issue that might drive me crazy. I hope I don't run out before getting my next order!

    Was this helpful?
  • Birdie
    Verified Buyer
    Reviewing
    The Hair Multiplier
    I recommend this product
    Age 35-44
    What is your hair length? Medium
    What is your hair type? Straight
    What are your hair concerns? Hair loss or shedding, Hair damage or breakage
    How long have you been using it for? 1 month
    What improvements have you noticed? Less shedding, Hair feels softer , Ends look healthier
    Rated 5 out of 5 stars
    2 weeks ago
    This stuff works!

    I’ve been using the serum for one month and I can already see results! My hair is softer, seems to be growing and definitely less shedding. Worth giving it a try.

    Was this helpful?
  • Meryl
    Verified Buyer
    Reviewing
    The Hair Multiplier
    I recommend this product
    Age 55+
    What is your hair length? Short
    What is your hair type? Straight
    What are your hair concerns? Hair too thin
    How long have you been using it for? 1 month
    What improvements have you noticed? Hair is thicker / fuller
    Rated 5 out of 5 stars
    2 weeks ago
    Love It

    Picture number one is my start of applying Le Jardin

    Picture number two is my one month application of Le Jardin. You can see that my hair line is becoming more solid and my hair is looking fuller.

    Can't wait to see the results that month number two bring.

    Was this helpful?
  • LGonzalez
    Verified Buyer
    Reviewing
    The Hair Multiplier
    I recommend this product
    Age 45-54
    What is your hair length? Long
    What is your hair type? Curly
    What are your hair concerns? Want longer hair, Hair too thin , Hair loss or shedding
    How long have you been using it for? More than 3 months
    What improvements have you noticed? Hair is longer, Hair is thicker / fuller, Ends look healthier
    Rated 5 out of 5 stars
    2 weeks ago
    My new favorite hair growth serum

    I’ve been using this now for about 6-8 months and even though I don’t use it daily, it’s still been working. I feel like the baby hairs that other serums brought about never grew, but with this I finally am seeing those hairs grow out and the hairline around my face finally fill in!! Will definitely keep using this!

    Was this helpful?
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