DENSITY HAIR SERUM
4.8 · 400 reviewsFormulated to perform
AHK-Cu Copper Peptide
AHK-Cu is a copper tripeptide studied for its interaction with the cells at the base of the hair follicle. In laboratory research on human dermal papilla cells, it was observed to support cell activity in a controlled setting. It's the single active in DENSITY, chosen for its follicle-specific profile and used here as a cosmetic ingredient to support the look of fuller, healthier hair.
Built for the scalp, not just the hair
DENSITY is a clean, single-peptide formula. No fillers, no fragrance, no 30-item ingredient list. Just AHK-Cu in a lightweight, fast-absorbing base that supports a conditioned scalp environment as the foundation for hair that looks fuller over time.
What AHK-Cu supports
Follicle-Targeted Support — AHK-Cu supports a healthy-looking scalp environment, the foundation for hair that looks fuller and more resilient. Less Shedding, More Staying — a comfortable, well-conditioned scalp supports fuller-looking hair, and many people notice fewer hairs in the drain over time. Calmer, Healthier Scalp — helps create a more balanced, comfortable scalp with less flaking and tightness. Layers With Your Routine — the lightweight serum absorbs fast and layers under or over your existing products with no greasy residue. One Clean Active — AHK-Cu in a simple base, no sulfates, parabens, fragrance, or fillers.
Your 12-Week Scalp Reset
DENSITY delivers 1% AHK-Cu in a simple twice-daily serum. Consistency is the mechanism. Here's how the weeks tend to unfold.
Month 1 — Absorbing In
AHK-Cu is absorbing into the scalp, supporting a calmer, more balanced environment. Dryness and tightness may begin to ease. No visible changes yet, and that's normal. Keep showing up twice a day.
Month 2 — Conditioning
The scalp environment is becoming more comfortable and conditioned. Existing hair may start to feel stronger. Some people notice less hair on the pillow, and fine hairs may appear in thinning areas.
Month 3+ — Fuller-Looking
With consistent use, the scalp stays well-conditioned and hair has had time to look fuller. Fuller-looking coverage in areas that were thinning, and hair that feels stronger overall.
How DENSITY compares
| DENSITY | Typical Serums | |
|---|---|---|
| Active | Single studied peptide (AHK-Cu) | Undisclosed blends |
| Formula | No fillers, fragrance, or sulfates | Often fragranced, multi-ingredient |
| Texture | Lightweight, non-greasy, fast-dry | Can leave residue |
| Daily use | Twice daily, layers easily | Varies |
How to use DENSITY
Morning. Night. That's the routine.
Apply to a clean scalp
Start with a clean, towel-dried or fully dry scalp. Part your hair and apply directly to thinning areas, or across the scalp for broader coverage.
Massage in for 30 to 60 seconds
Use your fingertips to work the serum into the scalp. This helps with absorption.
Let it dry, then layer
The formula dries in a couple of minutes. Once dry, apply your other products as usual. Use once in the morning and once at night.
Why AHK-Cu
In a 2007 laboratory study on human dermal papilla cells, AHK-Cu was observed to support cell activity in a controlled setting. These are early, lab-based findings. In DENSITY, AHK-Cu is used as a cosmetic ingredient to support the look of fuller, healthier hair, not as a treatment for hair loss.
Is DENSITY right for you?
This is for you if: you're noticing thinning around the crown or hairline and want to act early; your scalp feels dry or tight and you suspect it's affecting your hair; you want a clean, peptide-based addition to your routine; you prefer a no-filler formula built around a single studied active.
AHK-Cu is a synthetic copper peptide used primarily in hair and scalp formulations. It's designed to interact locally at the follicle level and has been studied for its role in dermal papilla cell activity.
Results vary. Most people begin evaluating changes within 4 to 8 weeks, with more noticeable differences often after 2 to 3 months of consistent twice-daily use.
No known side effects when used as directed. Avoid overuse or applying to broken skin. A patch test is recommended for sensitive skin.
Yes. Separate application by AM/PM or alternating nights rather than layering directly, to reduce irritation risk.
DENSITY focuses on scalp health and follicle support rather than forcing rapid growth, so it layers well with existing routines instead of replacing them.
"I'm 52 and my part had been widening for years. Three months in, the thinning at my crown looks noticeably fuller. My husband was the first to notice."
Diane K. · 52
Verified buyer
"Tried a drugstore hair serum for a year and felt nothing. This is completely different. Around week six I stopped seeing hair all over my pillow."
Rachel M. · 47
Verified buyer
"My hair looks thicker, my scalp doesn't feel tight anymore, and my hairline looks better than it has in a decade. 'Fuller' sounds like marketing until it happens to you."
Lisa T. · 49
Verified buyer
"By week four the shedding in the shower drain had dropped way off. Such a relief to not dread washing my hair."
Karen B. · 55
Verified buyer
"Menopause thinned my hair out fast and it wrecked my confidence. This brought fullness back to my crown. I feel like myself again."
Patricia H. · 51
Verified buyer
"My stylist asked what I'd changed because my hair looked so much denser at the roots. The only thing different was this."
Sandra L. · 48
Verified buyer
"Took about three weeks before I saw baby hairs along my hairline, so be patient. But once it kicked in, the regrowth was undeniable."
Michelle R. · 44
Verified buyer
"It absorbs fast, no greasy film, doesn't mess with my color. At 53 I didn't expect to get thickness back this easily."
Donna M. · 53
Verified buyer
"I apply it every morning and forget it's part of my routine until I notice how much fuller my hair looks in the mirror. Effortless."
Carol S. · 50
Verified buyer
- Pyo HK, et al. The effect of tripeptide-copper complex on human hair growth in vitro. Archives of Pharmacal Research. 2007.
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. For external use only. Not for use by persons under 18. Referenced research describes AHK-Cu generally and does not represent studies conducted on this specific product.
We're confident in the formula. If you're not seeing the results you hoped for, let us know and we'll make it right. No returns, no questions.