
"My ponytail feels so much thicker now. This actually works."
Sarah M.
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"My ponytail feels so much thicker now. This actually works."
Sarah M.

"Seeing way less hair in the shower drain after some weeks and my hairline is filling in."
- Jessica K.

"I finally have baby hairs growing back along my hairline. Absolutely love this serum!"
- Jennifer R.

"The only product that grew back my thin spots without irritating my sensitive scalp."
- Amanda B.

"Saved my thinning hair after having my baby without making my scalp greasy."
- Lisa T.

Exclusive welcome kit
A first-order ritual kit designed for visibly fuller-looking hair.
Hair Serum Transformation Pack
3-pack Hair Serum
First Purchase Includes:
Chance to win a Dyson Airwrap
You could win a Dyson Airwrap™ valued up to $749 (only valid with The Spa Dr. subscription)
Nutritional Guide for Hair Growth
Step-by-step nutritional plan for stronger, fuller-looking hair.
Scalp Massager
Boosts serum absorption and stimulates blood flow to follicles.
Free Shipping
Our Hair Serum is trusted by doctors and trichologists for its clinically-tested formula that targets thinning hair at the root.

Naturopath FDNP
Peptides that actually reach the scalp and support visible density.
Dermatology • Hair Health
Naturopathic Physician
Targets the root cause of thinning with a formula I trust.
Trichology • Hair Restoration
Naturopathic Physician
Clinically inspired ingredients that support stronger, fuller-looking hair.
Dermatology • Scalp Health
Board-Certified Doctor of Natural Medicine
A smart, science-backed approach to healthier, fuller-looking hair.
Dermatology • Hair Health
Certified Nutritionist & Midlife Hormone Health Advocate
A smart, science-backed approach to healthier, fuller-looking hair.
DERMATOLOGY • HAIR HEALTH40,492 Verified 5-star reviews
Lauren
Hair Serum
“It's the fullest my hair has looked since I had my baby”
Ellie M.
3 Step System
“Research shows that 80% of personal care products contain at least one toxic ingredient”
Mary
Age Defying Lift and Tight Serum
“This is been a total game changer to my skin.”
Jolene
Hair Serum
“My brush used to be full of hair every morning, but now the shedding decreased.”
Stefani
Hair Serum
“I switched to this product and my hair is visibly growing”
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