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Hair Serum

Enjoy a fuller and thicker-looking hair by promoting a balanced scalp appearance without harsh chemicals
Promotes a fuller-looking hair
Visibly thickens hair
Reduces the appearance of shedding and fallout
$24.50
$49
Save 50% first order*
Order today for a guaranteed Free Gift!
Youthful Eye
Cream
Full-Size
FREE
$38.00
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Refill ships in 30 days
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FREE shipping, gifts and savings

Hair Serum

Enjoy a fuller and thicker-looking hair by promoting a balanced scalp appearance without harsh chemicals
Promotes a fuller-looking hair
Visibly thickens hair
Reduces the appearance of shedding and fallout
$24.50
$49
Save 50% first order*
Order today for a guaranteed Free Gift!
Youthful Eye
Cream
Full-Size
FREE
$38.00
👉 Subscribe and Save 50% on first order
Shop Now
Refill ships in 30 days
Adjust shipments or cancel anytime*
FREE shipping, gifts and savings
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The must-have for fuller, thicker-looking hair

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.
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.

The unique triple-action formula

Combining the power of science and nature to deliver both quick and visible results with a tested formula, perfect for every hair type:
Promotes a fuller-looking hair
Reduces the look of shedding and fallout

Provides a thickening-like effect

Why women are obsessed about it

Visibly fuller and thicker-looking hair
‍Imagine running your fingers through your hair, feeling confident and beautiful, at home or in social gatherings.
Reduce the look of visible scalp
Hormone imbalances and harsh chemicals made it tough, but today, you can 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. After continuous use, you may start noticing a difference in the look of your hair.
Affordable and High-Quality
No need to constantly search for new solutions or expensive treatments.
Good for every hair type
Our formula combines a broad spectrum of time-tested and game-changing ingredients that deliver visible results regardless of your hair’s thickness, color, and overall look.
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How to use it

Use 1 to 2 dropperfuls and apply directly to your scalp, sectioning your hair with the dropper tip. Use enough serum to lightly cover the areas of concern. Massage with your fingertips
Apply daily
Track your progress with photos

The Key Ingredients

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 Ingredients' 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

Raving Reviews

4.6/5
2,378+ Reviews
Elara Winslow
Verified Customer
August 20, 2024
A Go-To for Postpartum Hair and Itchy Scalp Relief
A Go-To for Postpartum Hair and Itchy Scalp Relief

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
August 15, 2024
Noticeable Results!
Noticeable Results!

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
August 11, 2024
Affordable Quality, Incredible Results
Affordable Quality, Incredible Results

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
August 8, 2024
Thicker, Longer Hair After Just a Few Uses
Thicker, Longer Hair After Just a Few Uses

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

Zoe Gresham
Verified Customer
August 7, 2024
Healthier Scalp, Fuller Hair
Healthier Scalp, Fuller Hair

y 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
August 5, 2024
Too Early to Tell, But Loving the way it feels
Too Early to Tell, But Loving the way it feels

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

Emma Brooks
Verified Customer
August 3, 2024
Healthier Scalp and Less Shedding with This Serum
Healthier Scalp and Less Shedding with This Serum

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
August 2, 2024
Thicker Hair in Just a Few Weeks
Thicker Hair in Just a Few Weeks

I’ve been using this hair serum for about three 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 three 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
August 12, 2024
Effective for Postpartum Hair Loss
Effective for 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.

Formulated by the renowned Dr. Cates

Formulated by the renowned Dr. Cates

Her groundbreaking discoveries in the clean beauty industry led her to be invited to the acclaimed The Doctors show, write 2 bestsellers, being featured in over 250 podcasts and host her own TV Show.
“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.”

Try today risk-FREE

If you are not 100% amazed, or if your family and friends aren’t telling you how amazing your hair looks… Then you will get a full refund within the first 30 days after ordering The Spa Dr. Hair Serum. We make it easy for you.

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.

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.

© 2024, The Spa Dr.