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Peptide-Powered Hair Serum To Support Visibly Thicker, Fuller-Looking Hair.
Doctor-formulated serum that strengthens the follicle’s anchoring structure to the root, so hair stops shedding and holds stronger.
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$60.00
$34.99
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$180.00
$69.98
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money-back guarantee
See less shedding in 30 days or it's free.
See less shedding in 30 days or it's free.
Clinically
Tested
Tested
Doctor
Formulated
Formulated
Non-Toxic
Ingredients
Ingredients
Benefits
Visibly reduces shedding and breakage — hair stays anchored longer*
Supports a healthier scalp environment for stronger, denser-looking hair over time*
Promotes thicker, fuller-looking strands*
Water-based formula — absorbs into the scalp, never coats or clogs*
Doctor-formulated with clean, non-toxic ingredients — safe for everyday long-term use
How It Works
Most hair serums are oil-based — they coat the scalp and add to the buildup that's already suffocating your follicles. This one is different.
Step 1 — It penetrates, not coats: The water-based formula passes through product buildup and absorbs directly into the scalp. No oils. No silicones. No residue.
Step 2 — It strengthens the follicle from the root: Acetyl Tetrapeptide-3 reinforces the protein anchoring structure that holds each strand in place — so hair stops releasing prematurely.
Step 3 — It supports a healthier scalp environment: Botanical extracts calm irritation, restore moisture balance, and support healthy circulation, creating the conditions for fuller-looking hair to thrive.
Step 1 — It penetrates, not coats: The water-based formula passes through product buildup and absorbs directly into the scalp. No oils. No silicones. No residue.
Step 2 — It strengthens the follicle from the root: Acetyl Tetrapeptide-3 reinforces the protein anchoring structure that holds each strand in place — so hair stops releasing prematurely.
Step 3 — It supports a healthier scalp environment: Botanical extracts calm irritation, restore moisture balance, and support healthy circulation, creating the conditions for fuller-looking hair to thrive.
How To Use
Apply serum directly to your scalp using the dropper tip. Section wet or dry hair as you go — focus on areas of concern. Massage gently with fingertips for absorption. Leave in. Once daily. That's it.
What's NOT In This Formula
No parabens. No phthalates. No gluten. No silicones. No sulfates. No synthetic fragrance. No drugs. Safe for color-treated hair. Extension-friendly.
Peptide-Powered Hair Serum To Support Visibly Thicker, Fuller-Looking Hair.
Doctor-formulated serum that strengthens the follicle’s anchoring structure to the root, so hair stops shedding and holds stronger.
Select quantity:
Spring Sale: FREE gifts with your order
SHOP NOW
$60.00
$34.99
Monthly VIP Benefits
FREE U.S. Shipping
Unlock 30% OFF Forever
Refil ships in 30 days at $41.99
Pause, Skip or Cancel Anytime
Spring Sale: FREE gifts with your order
SHOP NOW
$180.00
$69.98
Monthly VIP Benefits
FREE U.S. Shipping
Unlock 53% OFF Forever
Refill ships in 90 days at $27.99
Pause, Skip or Cancel Anytime
money-back guarantee
See less shedding in 30 days or it's free.
See less shedding in 30 days or it's free.
Clinically
Tested
Tested
Doctor
Formulated
Formulated
Non-Toxic
Ingredients
Ingredients
Benefits
Visibly reduces shedding and breakage — hair stays anchored longer*
Supports a healthier scalp environment for stronger, denser-looking hair over time*
Promotes thicker, fuller-looking strands*
Water-based formula — absorbs into the scalp, never coats or clogs*
Doctor-formulated with clean, non-toxic ingredients — safe for everyday long-term use
How It Works
Most hair serums are oil-based — they coat the scalp and add to the buildup that's already suffocating your follicles. This one is different.
Step 1 — It penetrates, not coats: The water-based formula passes through product buildup and absorbs directly into the scalp. No oils. No silicones. No residue.
Step 2 — It strengthens the follicle from the root: Acetyl Tetrapeptide-3 reinforces the protein anchoring structure that holds each strand in place — so hair stops releasing prematurely.
Step 3 — It supports a healthier scalp environment: Botanical extracts calm irritation, restore moisture balance, and support healthy circulation, creating the conditions for fuller-looking hair to thrive.
Step 1 — It penetrates, not coats: The water-based formula passes through product buildup and absorbs directly into the scalp. No oils. No silicones. No residue.
Step 2 — It strengthens the follicle from the root: Acetyl Tetrapeptide-3 reinforces the protein anchoring structure that holds each strand in place — so hair stops releasing prematurely.
Step 3 — It supports a healthier scalp environment: Botanical extracts calm irritation, restore moisture balance, and support healthy circulation, creating the conditions for fuller-looking hair to thrive.
How To Use
Apply serum directly to your scalp using the dropper tip. Section wet or dry hair as you go — focus on areas of concern. Massage gently with fingertips for absorption. Leave in. Once daily. That's it.
What's NOT In This Formula
No parabens. No phthalates. No gluten. No silicones. No sulfates. No synthetic fragrance. No drugs. Safe for color-treated hair. Extension-friendly.
AS SEEN ON:
300,000+ people have fuller hair thanks to The Spa Dr.
Linda
"My hairstylist couldn't believe the difference."
Using The Spa Dr.® Hair Serum
Jessica
"I finally stopped dreading the shower."
Using The Spa Dr.® Hair Serum and Welcome kit
Susana
"The sparse spots are actually filling in."
Using The Spa Dr.® Hair Serum and Welcome kit
Linda
"My hairstylist couldn't believe the difference."
Using The Spa Dr.® Hair Serum
Jessica
"I finally stopped dreading the shower."
Using The Spa Dr.® Hair Serum and Welcome kit
Susana
"The sparse spots are actually filling in."
Using The Spa Dr.® Hair Serum and Welcome kit
Rebuilt the root.
Stop the thinning.
Our peptide serum strengthens the anchoring structure so hair stays, grows, and thrives.
Fuller, Stronger Hair: Reinforcing the hair anchoring structure.
This water-based hair serum penetrates product buildup to deliver peptides directly to the follicle.
Clinically proven to increase hair thickness
Discover the Hair Care science behind this product
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Reinforces the protein anchoring structure that holds each strand in place — so hair stays rooted longer and sheds less.*
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Supports the visible growth phase of the hair cycle — giving strands more time to reach fullness before shedding.*
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Helps counter the follicle-weakening process that accelerates with hormonal change — supporting thicker, denser-looking strands over time.*
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Calms scalp irritation and restores moisture balance — creating a healthier foundation where stronger hair can thrive.*
Full Ingredient list
Water, Pentylene Glycol, Propanediol, Gluconodeltalactone, Niacinamide, Sodium Citrate, Acetyl Tetrapeptide-3, Trifolium Pratense (Clover) Flower Extract, Pisum Sativum (Pea) Sprout Extract, Cucurbita Pepo (Pumpkin) Seed Extract, Centella Asiatica (Gotu Kola) Extract, Panax Ginseng Root Extract, Macrocystis Pyrifera (Kelp) Extract, Glycerin, Butylene Glycol, Dextran, Sodium Benzoate, Citric Acid.
We’re Serious About Quality
Us vs. Them
The Real Difference
Recommended by Doctors and Experts
"I recommend this clean, science-backed formula designed to nourish the scalp and support fuller-looking hair from within."
–Dr. Francesca Le Blanc Naturopathic Physician
"The formula is healthy, safe, and gives my hair the nourishment it needs without any harmful ingredients."
–Dr. Terra Winston Naturopathic Physician
"As a Naturopath in perimenopause, I need clean products that won't disrupt hormones. This hair serum works. My hair feels healthier, more hydrated, and stronger."
– Jill Zavada, Naturopath FDNP
Easy to Use In 2 Simple Steps
Drop, massage, and glow
Simply apply 2-3 drops directly to your scalp, then massage gently. It’s a targeted, no-mess ritual for fuller-looking hair.
Ready to go with just 2-3 drops
Raving Reviews
4.6/5 17,756+ Reviews
Try it risk-free for 30 days.
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Frequently Asked Questions
How should I use this Hair Serum?
For optimal results, apply the Hair Serum daily. Doctors recommend using it once in the morning and once in the evening. Simply part your hair into sections, apply a few drops directly onto the scalp, and gently massage with your fingertips to support better absorption. It takes just a couple of minutes to complete.
Is this Hair Serum fragrance-free?
Yes, our Hair Serum is completely fragrance-free. We've carefully crafted this formula to focus on supporting the appearance of your hair and scalp without the potential irritation that fragrances can cause. Enjoy a clean, natural experience that prioritizes your hair and scalp’s comfort.
Can I use this Hair Serum if I have sensitive skin?
Absolutely. Doctors have designed this Hair Serum to be gentle yet effective for all scalp types, including sensitive skin. However, if you’re concerned, we recommend performing a patch test on the inside of your elbow to ensure compatibility with your skin.
How long will it take to see results?
Results may vary depending on the individual, but many of our users notice a reduction in the appearance of hair shedding and a healthier-looking scalp within the first few weeks. For best results, consistent use over 4-8 weeks is recommended.
What ingredients are in this hair serum?
Water, Pentylene Glycol, Propanediol, Gluconodelta-lactone, Niacinamide, Sodium Citrate, Acetyl Tetrapeptide-3, Trifolium Pratense (Clover) Flower Extract, Pisum Sativum (Pea) Sprout Extract, Cucurbita Pepo (Pumpkin) Seed Extract, Centella Asiatica (Gotu Kola) Extract, Panax Ginseng Root Extract, Macrocystis Pyrifera (Kelp) Extract, Glycerin, Butylene Glycol, Dextran, Sodium Benzoate, Citric Acid.
Is this product safe for color-treated hair?
Yes, our Hair Serum is safe for color-treated hair. Its gentle formula is designed to nourish and support your hair's appearance without stripping or fading color.
Is the Hair Serum gluten and soy-free?
Yes, our Hair Serum is both gluten-free and soy-free, making it suitable for those with sensitivities to these ingredients.
What is the shelf life of the Hair Serum?
Our Hair Serum has a shelf life of 2 years when unopened. Once opened, it should be used within 12 months to ensure maximum efficacy and freshness.
Do you offer refunds?
Yes, we stand by the quality of our products. If you're not completely satisfied with your purchase, you can request a refund within 30 days of the ship date. Please contact our customer service team for assistance.
Will the Hair Serum leave my hair greasy?
No, our Hair Serum is formulated to be lightweight and non-greasy, ensuring your hair feels natural and clean after application.
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