
"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.

the science
GHK-Cu helps support thicker, fuller-looking hair, while Acetyl Tetrapeptide-3 helps strengthen and support the hair at the root.

Exclusive welcome kit
A first-order ritual kit designed for visibly fuller-looking hair.
Hair Serum Transformation Pack
Buy 2 Get 1 Hair Serum forFree
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 Copper Peptide Hair Serum is trusted by doctors and trichologists for a clinically-tested formula that delivers GHK-Cu, a Copper Peptide, straight to the root

Naturopath FDNP
“A Copper Peptide that actually reaches the scalp and supports visible density”
Dermatology • Hair Health
Naturopathic Physician
“It targets the root cause of thinning with a Copper Peptide I trust.”
Trichology • Hair Restoration
Naturopathic Physician
“Clinically inspired Copper Peptide ingredients that support stronger, fuller-looking hair.”
Dermatology • Scalp Health
Board-Certified Doctor of Natural Medicine
“A drug-free, science-backed way to support fuller-looking hair, no minoxidil, no hormones.”
Dermatology • Hair Health
Certified Nutritionist & Midlife Hormone Health Advocate
“For women in midlife, giving the follicle back the Copper Peptide it runs low on just makes sense.”
DERMATOLOGY • HAIR HEALTH4.6 from 17,756+ reviews | 300,000+ customers



“Chasing the full potential of biomimetic peptides in hair growth cycles is where our curiosity, rigor, and purpose live.”


“Chasing the full potential of biomimetic peptides in hair growth cycles is where our curiosity, rigor, and purpose live.”

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