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Home → Haircare

→ The Spa Dr.® Hair Serum

The Spa Dr. hair thickening serum bottle and glass dropper displaying key benefits for fuller-looking hair and scalp hydration.
The Spa Dr. hair thickening serum bottle and glass dropper displaying key benefits for fuller-looking hair and scalp hydration.

The Spa Dr.® Hair Serum

Select quantity:

Includes 4 free bonuses

Free
Shipping

FREE $4.95

Scalp
Massager

FREE $39.99

Hair Growth
Guide

FREE $29.99

Dyson
Airwrap™

CHANCE TO WIN

Monthly VIP Benefits

  • Unlock 53% OFF Forever
  • Refill ships in 90 days at $27.99 each

A peptide-powered, water-based serum that penetrates the scalp to support visibly thicker, fuller- looking hair — without harsh chemicals, silicones, or oils.

Clinically Tested • Doctor Formulated • Non-Toxic Ingredients

30 day money back guarantee

Money-back guarantee:

See less shedding in 30 days or it's free.

300,000+ people have fuller hair thanks to The Spa Dr.

– Lea before and after

"The first thing I noticed was way less shedding. That alone made me want to keep using it."

– Lea

– Linda before and after

"My hairstylist couldn't believe the difference."

– Linda

– Jessica before and after

"I finally stopped dreading the shower."

– Jessica

– Karen before and after

"I finally feel comfortable wearing my hair back again."

– Karen

– Amy before and after

"Not gonna lie, I almost stopped using it. But a few months later... my hair looks so much better. Totally worth the wait."

– Amy

Applying the serum

Third-party Tested

Clinically proven to increase hair thickness

88%

Saw hair volume increase after just 56 days*

94%

Noticed less hair loss within 56 days*

88%

Improved hair thickness over time.*

*Based on a clinical study with 33 participants over 90 days.

How it works

Rebuild the root. Stop the thinning.

Our peptide serum strengthens the anchoring structure so hair stays, grows, and thrives.

Shedding starts at the root

Shedding starts at the root

When the follicle becomes stressed, hair loses its strong foundation and is more likely to shed before completing its growth cycle.

Benefits of our peptide powered Hair serum

Bring Back Thicker, Fuller-Looking Hair

The Spa Dr. Hair Serum bottle
Promotes visibly fuller-looking hairSupports a healthy, balanced scalpStrengthens against breakageLess visible thinning and shedding

Benefits of our peptide powered Hair serum

Bring Back Thicker, Fuller-Looking Hair

Strengthens against breakagePromotes visibly fuller-looking hairSupports a healthy, balanced scalpLess visible thinning and shedding

Discover the Hair Care science behind this product

Peptides (Acetyl Tetrapeptide-3)

Reinforces the protein anchoring structure that holds each strand in place — so hair stays rooted longer and sheds less.*

We're Serious About Quality

Cruelty freeSoy freeOrganic ingredientsGluten free

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