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Hair Serum For Thicker Fuller-Looking Hair

A doctor-formulated serum made to address the signs of aging hair — like thinning, shedding, and scalp imbalance — without toxic ingredients.
Thicker, fuller-looking hair
Reduce thinning and shedding
Stronger, healthier hair
Reduces breakage
$49.00
$24.50
50% OFF | save $24.50
Order today for guaranteed Free Gifts!
Scalp Massager
FREE
$39.99
Save 50% on 1-month trial. After that, receive a 3-month supply every 3 months for $120
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END OF SEASON SALE
⚡︎ SELLING FAST

Hair Serum For Thicker Fuller-Looking Hair

A doctor-formulated serum made to address the signs of aging hair — like thinning, shedding, and scalp imbalance — without toxic ingredients.
Over 2,000 purchases last month
-50%
$23.99
($0.79 / Milliliter)
Original Price: $48.00
Thicker, fuller-looking hair
Reduce thinning and shedding
Stronger, healthier hair
Reduces breakage
$49.00
$24.50
50% OFF | save $24.50
Order today for guaranteed Free Gift!
Scalp Massager
FREE
$39.99
Save 50% on 1-month trial. After that, receive a 3-month supply every 3 months for $120.
SHOP NOW
Over 214,000 bottles sold
30-day Guarantee
Free
Shipping
Cancel
Anytime
Free
Return

Real Customer Results

Linda
Fuller hair in 2 months? My photo says it all
"This serum is amazing. In two months my hair is fuller, it doesn't feel weighed down, and I can finally style it how I want again. The photo says it all!"
Jessica
A lifesaver for postpartum shedding
"The postpartum hair loss hit me hard and was honestly freaking me out. I'm so relieved this started working in about 6 weeks. Seeing less hair fall out feels like I'm finally myself again."
Lea
Those sparse areas look so much fuller
"The hair on the sides of my head was so thin and fragile... After 3 months, you can see the difference, those sparse areas look so much fuller!"

Stop Hiding Thinning Hair: Start Loving How You Look Again!

No woman should feel embarrassed by shedding, thinning, or a visible scalp. You deserve to feel confident — with every strand.

That’s why we created one of the most advanced, doctor-formulated serums to reduce shedding, boost fullness, and restore your hair’s natural beauty from the root up.
Visibly fuller and thicker-looking hair
Imagine running your fingers through your hair, feeling confident and beautiful
Reduce the look of visible scalp
Start showing off your hair with pride and live freely
Enjoy a healthier-looking scalp
This feels amazing on your scalp, providing a fresh, revitalized sensation
For every hair type
Visible results regardless of your hair’sthickness, color, and overall look

Clinically-Backed Results

Saw hair volume after just 56 days.*
Noticed less hair loss within 56 days.*
Reported hair thickness over time.*
*Based on a Clinical Study with 33 participants over 56 days.
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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

Why Thousands of Women Have Switched to This

Hair thinning and visible scalp happen due to hormonal changes, stress, and environmental pollutants that leaves our follicles without the protective properties of estrogen.

Unfortunately, research shows that over 80% of personal care products contain one toxic ingredient. Most hair care products contain harsh chemicals that damage your scalp and hair even more.

This is why we analyzed and banned over 1,527 ingredients to create truly clean, safe formulas that work.
‍
This Hair Serum targets the appearance of thinning hair and reduces the look of a visible scalp by combining the power of clean, non-toxic ingredients and the latest in hair care science for a more confident you.
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What's disrupting your skin microbiome? Shockingly, research shows that up to 80% of personal care products include at least one toxic ingredient.²

These Endocrine-Disrupting Chemicals (EDCs) found in common skincare products disrupt hormonal balance and damage your skin's natural defenses.

This is why we analyzed and banned over 1,527 ingredients while only 11 are banned in the U.S. to create a skincare formula unlike anything you’ve tried before.
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Powerful Ingredients for visible results

Doctor-Formulated powerful blend of clean, non-toxic and effective ingredients, each chosen for their ability to promote healthier and thicker-looking hair.

Peptides

Support the appearance of fuller and healthier-looking hair

Red Clover Flower Extract

Rich in bioactive compounds, Promote a  thickness and fuller hair appearance

Pea Sprout Extract

Rich in phytonutrients, promotes fuller and thicker-looking hair

Centella Asiatica (Gotu Kola)

A soothing herb that supports healthier-looking hair
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
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Full Ingredients' list

Water,  Aloe Leaf Juice Powder*, Pineapple Fruit Extract*, Acerola Cherry Fruit  Extract*, Green Algae Extract*, Pichia/Resveratrol Ferment Extract,  Sodium Hyaluronate, Olive Leaf Extract*, Rosemary Leaf Extract*,  Bergamot Fruit Oil*, Ylang Ylang Flower Oil*, Mandarin Peel Oil*, May  Chang Fruit Oil*, Amethyst Powder, Pullulan, Lysolecithin, Sclerorium  Gum, Xanthan Gum, Phytic Acid, Citric Acid, Gluconolactone, Sodium  Benzoate, Calcium Gluconate, Citral, Limonene, Linalool.

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Formulated by the renowned Dr. Cates

"We developed perfectly balanced formulas containing my favorite clean, safe, organic & effective ingredients. It is the only product I know that uses them in the right dosage and without being combined with potentially harmful chemicals.”

Real Women. Real Results.

4.6/5
17,756+ Reviews
Written Reviews
Video Reviews
Elara Winslow
Verified Customer
July 7, 2025
Hair Loss? Gone!
Hair loss? Gone!!

I'm a big fan of Dr. Trevor Cates and have followed her for years. I tried this serum for postpartum hair loss and my dry, itchy scalp. I use it daily with a dropper and massage it in. When my scalp feels good, I take a break, but I always come back to it when the itchiness returns.

I'm a big fan of Dr. Trevor Cates and have followed her for years. I tried this serum for postpartum hair loss and my dry, itchy scalp. I use it daily with a dropper and massage it in. When my scalp feels good, I take a break, but I always come back to it when the itchiness returns.

Daphne Sinclair
Verified Customer
July 4, 2025
My hair is thicker!
My hair is thicker!

I've used this for 3 months, and the tingling is great. My scalp doesn't itch anymore, and my hair looks thicker. Definitely recommend it!

I've used this for 3 months, and the tingling is great. My scalp doesn't itch anymore, and my hair looks thicker. Definitely recommend it!

Sarah Redmond
Verified Customer
June 11, 2025
Forget the expensive serums...This one works!
Forget the expensive serums...This one works!

I’ve tried so many expensive products, but this serum outperforms them all. It’s affordable, high-quality, and has given me the fuller, thicker hair I’ve always wanted. My scalp also looks so much better now. I highly recommend it!

I’ve tried so many expensive products, but this serum outperforms them all. It’s affordable, high-quality, and has given me the fuller, thicker hair I’ve always wanted. My scalp also looks so much better now. I highly recommend it!

Isabella White
Verified Customer
May 8, 2025
My hair struggled to Grow...Not Anymore!
My hair struggled to Grow...Not Anymore!

This hair serum is amazing! After hearing so many recommendations, I tried it and noticed a big ifference. My hair, which struggled to grow due to heat and products, is now thickerand longer. I use it every other day. Highly recommend giving it a try!

This hair serum is amazing! After hearing so many recommendations, I tried it and noticed a big ifference. My hair, which struggled to grow due to heat and products, is now thickerand longer. I use it every other day. Highly recommend giving it a try!

Zoe Gresham
Verified Customer
April 7, 2025
I can’t believe the difference in my hair!
I can’t believe the difference in my hair!

My scalp feels so much healthier, and my hair looks noticeably thicker. It’s lightweight, non-greasy, and works wonders on my fine hair. I can’t believe the difference it’s made!

My scalp feels so much healthier, and my hair looks noticeably thicker. It’s lightweight, non-greasy, and works wonders on my fine hair. I can’t believe the difference it’s made!

Tamsin Lovell
Verified Customer
March 5, 2025
So far, so good!
So far, so good!

I have thinning hair, so I decided to try this. It’s too soon to tell if it’s helping with growth, but it smellsnice and gives my scalp a pleasant tingle. I’m going to keep using it.

I have thinning hair, so I decided to try this. It’s too soon to tell if it’s helping with growth, but it smellsnice and gives my scalp a pleasant tingle. I’m going to keep using it.

Emma Brooks
Verified Customer
February 3, 2025
I'm seeing way less hair in my brush!
I'm seeing way less hair in my brush!

This serum has done wonders for my scalp's health! It has significantly reduced signs of shedding and fallout. The refreshing scent is a nice touch

This serum has done wonders for my scalp's health! It has significantly reduced signs of shedding and fallout. The refreshing scent is a nice touch

Grace Delaney
Verified Customer
January 2, 2025
My scalp isn’t visible anymore!
My scalp isn’t visible anymore!

I’ve been using this hair serum for about 3 weeks, and the results are amazing. My hair looks visibly fuller and thicker. I’ve even noticed that my scalp isn’t as visible anymore. This serum has become a staple in my routine!

I’ve been using this hair serum for about 3 weeks, and the results are amazing. My hair looks visibly fuller and thicker. I’ve even noticed that my scalp isn’t as visible anymore. This serum has become a staple in my routine!

Lauren Bennett
Verified Customer
January 1, 2025
This stopped my Postpartum Hair Loss!
This stopped my Postpartum Hair Loss!

Hoping this helps with postpartum hair loss. It's easy to apply, but it can leave my hair a bit oily, so I usually use it when I'm staying at home.

Hoping this helps with postpartum hair loss. It's easy to apply, but it can leave my hair a bit oily, so I usually use it when I'm staying at home.

Vicki M.
October 23, 2024
Jill S.
November 7, 2024
Angela B.
December 1, 2024
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Frequently Asked Questions

How should I use this Hair Serum?

For optimal results, apply the Hair Serum daily. Dr. Cates recommends 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 you 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. Dr. Cates has 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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**These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Use only as directed. The information provided herein is intended for your general knowledge only and is not intended to be, nor is it, medical advice or a substitute for medical advice. If you have or suspect you have a specific medical condition or disease, please consult your healthcare provider.While many individuals have experienced positive outcomes by using this product, it's important to realize that individual results may vary from person to person due to various factors.

© 2025, The Spa Dr.