01 · Part and applyApply directly to clean, dry scalp
Part the hair where needed and apply the serum directly along the part or the scalp areas you want to target.
About this serum
AHK-Cu + GHK-Cu Hair Serum Pro is a leave-on scalp formula combining two different copper-binding tripeptides in one bottle.
Each 2 oz (60 mL) bottle is formulated and labeled with 2,400 mg of AHK-Cu + 2,400 mg of GHK-Cu, for 4,800 mg of total copper peptides at 8%. The current label lists three ingredients in this order: Distilled Water, GHK-Cu HCl and AHK-Cu.
AHK-Cu and GHK-Cu have different research histories. AHK-Cu has direct experimental research involving human hair follicles and dermal papilla cells, while GHK-Cu has a broader research history across skin, tissue and extracellular-matrix biology.
There is currently no controlled human trial showing that combining AHK-Cu and GHK-Cu produces better hair-growth outcomes than either peptide alone.
What you can expect What to expect
- Two copper peptides in one formula
- 2,400 mg AHK-Cu + 2,400 mg GHK-Cu
- Lightweight leave-on scalp application
- Three listed ingredients
- Direct use on targeted scalp areas
Full descriptionWhy combine AHK-Cu and GHK-Cu · Why a 1:1 formula · What the evidence does not establish
Why combine AHK-Cu and GHK-Cu?
AHK-Cu and GHK-Cu are related copper-binding tripeptides, but they are different molecules with different research histories.
AHK-Cu has direct experimental research involving isolated human hair follicles and cultured dermal papilla cells.
GHK and GHK-Cu have a broader research history across skin and tissue biology. A small human hair study also evaluated a topical combination containing GHK peptide together with 5-aminolevulinic acid, but that study did not test isolated GHK-Cu or this finished Serum Pro formula.
This product combines both peptides for users who specifically want a dual copper-peptide scalp serum.
That does not mean AHK-Cu and GHK-Cu have been clinically proven to work synergistically or that the combination has been shown to outperform a single-peptide formula.
Why a 1:1 formula?
The product is formulated and labeled with 2,400 mg of AHK-Cu and 2,400 mg of GHK-Cu per 2 oz bottle, giving it an equal 1:1 target composition.
The 1:1 ratio defines how the two peptides are balanced in the formula. There is currently no controlled human study establishing that a 1:1 AHK-Cu-to-GHK-Cu ratio is the clinically optimal ratio for hair growth.
What the evidence does not establish
This is a cosmetic scalp serum, not an FDA-approved treatment for hair loss.
No controlled human trial has tested this exact finished AHK-Cu + GHK-Cu serum for hair regrowth, hair count, hair density or treatment of a diagnosed hair-loss condition.
Ingredient research can help explain why AHK-Cu and GHK-Cu are used in scalp products, but it should not be presented as clinical evidence for this finished formula.
K.W.
Verified customer
Before and after photos
Before-and-after photos shared by verified customers of our copper peptide hair serums. Photos are shown as submitted, with the week they were taken.
Customer photos show individual experiences and are not a controlled clinical study.
K.W.
Individual results vary. These are customer experiences, not clinical evidence.
Copper Tripeptide-1 and -3
The two copper peptides
A short guide to the two actives in the bottle, and why they are paired.
-
01
Both peptides are copper-binding tripeptides: three amino acids holding a copper ion. The copper-peptide complexes are what make the serum blue.
-
02
They are related but different molecules. AHK-Cu has direct experimental research involving human hair follicles and dermal papilla cells; GHK-Cu has a broader research history across skin, tissue and extracellular-matrix biology.
-
03
The Pro pairs them 1:1, 2,400 mg of each, for people who want both in one serum. No controlled human trial has shown that the combination works better than either peptide alone.
What goes into the bottle
A dual copper-peptide formula labeled with 4,800 mg total copper peptides per 2 oz (60 mL) bottle. The label lists three ingredients: Distilled Water, GHK-Cu HCl and AHK-Cu.
COPPER PEPTIDE · 2,400 MG
AHK-Cu
Copper Tripeptide-3
A copper-binding tripeptide with direct experimental research involving human hair follicles and dermal papilla cells.
The complete label listAll ingredients · as printed on the label
- AHK-Cu (Copper Tripeptides
- GHK-Cu (Copper Peptides)
- Distilled Water
As printed on the bottle. The label lists GHK-Cu before AHK-Cu.
Three listed ingredients
Distilled Water, GHK-Cu HCl and AHK-Cu. The full label takes seconds to check.
Why the serum is blue
Both peptides contain copper. The color comes from the copper-peptide complexes themselves; nothing is added simply to make the serum blue.
What to expect with consistent use
No controlled human trial establishes a results timeline for this AHK-Cu + GHK-Cu combination, so your own photos are the best guide. Here is how the first weeks usually go, with a few words from customers.
-
Day 1
Take a starting photo
Photograph your part or crown in daylight before the first application, and repeat the same photo every four weeks under similar lighting and styling. Gradual changes are hard to judge in a mirror.
“Love the product easy to use” Michael C.
-
Weeks 1 to 4
First applications
The lightweight feel, the blue color, the drying time and how the serum fits into your scalp routine are among the first things you can assess.
Tip: keep the bottle next to your toothbrush, so morning and evening use becomes a habit.
“Giving it time as most products take several months to see any results.” Mike T.
-
Weeks 5 to 8
With consistent use
Keep to the morning-and-evening directions and compare each month’s photo with Day 1 rather than judging in the mirror. Experiences vary from person to person.
“So far so good, hair is feeling thicker. Sticking with the more natural method. It dries quickly and doesn’t smell.” Jose P.
-
Weeks 9 to 12
One bottle, and your photos
Take a week-12 photo and compare it with Day 1 to judge how the serum suits you.
How long one bottle lasts depends on the amount used at each application. Subscribe and Save delivers a bottle every month at 20% off and can be paused at any time.
“With more conservative sprays you can easily get more than a month even using it twice a day, and using it once a day extends that even further.” Tyler M.
Quotes come from verified customer reviews and describe individual experiences, not a clinical study. Results vary. This is a cosmetic product, not a hair-loss treatment.
A simple daily scalp routine
Leave-on use on a clean, dry scalp, morning and evening.
01 · Part and apply
02 · 30 to 60 secondsMassage it in
Gently massage for 30 to 60 seconds with clean fingertips to distribute the serum across the application area.
03 · Leave onDo not rinse
Let the serum stay on the scalp and dry before layering other products. Repeat in the evening, and let it dry before bed.
Let it dry before fabric
The serum is deeply colored. Let it dry before contact with light-colored bedding, hats or clothing. On white, silver or bleached hair, keep it at the scalp; shampoo washes it out.
Test on a small area first
Test the serum on a small scalp area first if you are sensitive or are introducing several new scalp products at the same time. Stop if irritation persists, and keep it away from the eyes and broken skin.
What you can layer it with
Let the serum dry before adding other products. There is no clinically established universal AHK-Cu + GHK-Cu schedule for combining the serum with minoxidil, microneedling or other active scalp treatments, so ask your clinician or follow your device instructions on timing.
What the lab reports show, and what research can tell us
Lab reports and published ingredient research answer different questions. A lab report documents measurements on a specific sample or production lot. Published research investigates AHK-Cu or GHK/GHK-Cu more broadly and does not test this finished dual-peptide serum. We keep the two separate.
Two kinds of evidence
Lab reportMeasures one sample or lot of this finished serum.
Published researchStudies each peptide more broadly, not this serum.
Ex vivoHuman hair follicles
AHK-Cu in ex vivo research
AHK-Cu was tested in isolated human hair follicles and stimulated follicle elongation under laboratory conditions. The study did not test this finished dual-peptide serum on people's scalps.
Read the full AHK-Cu hair research review
Ingredient research · Pyo et al., 2007 · not this finished product45 menHuman hair study
GHK peptide in a combination formula
A small human study in 45 men with pattern hair loss evaluated a topical formula containing 5-aminolevulinic acid together with GHK peptide. Hair counts increased in the active groups, but the study did not test isolated GHK-Cu and did not evaluate this Serum Pro formula.
Combination-formula research · Lee et al., 2016 · not this finished productNot yetDual-peptide evidence
What has not been clinically established
No controlled human trial has established that combining AHK-Cu and GHK-Cu in a 1:1 topical serum produces better hair-growth outcomes than either peptide alone. The two peptides have different research histories, but ingredient research is not proof of synergy in this finished formula.
Evidence limitation · combination not clinically establishedCertificate of analysis
References · Ingredient research, not studies of this finished serum 3
- Pyo HK, Yoo HG, Won CH, et al. The effect of tripeptide-copper complex on human hair growth in vitro. Arch Pharm Res. 2007;30(7):834-839. doi:10.1007/BF02978833. View study ↗
- Lee WJ, Sim HB, Jang YH, Lee SJ, Kim DW, Yim SH. Efficacy of a Complex of 5-Aminolevulinic Acid and Glycyl-Histidyl-Lysine Peptide on Hair Growth. Annals of Dermatology. 2016;28(4):438-443. doi:10.5021/ad.2016.28.4.438. View study ↗
- Fan C, Chen Y, Huang Q, et al. Overview of Short Peptides for Hair Loss. Biomedicines. 2026;14(4):864. View review ↗
Which copper peptide serum is right for you?
They differ in which copper peptide they carry, how often you use them and how long a bottle lasts. No study has compared them, so pick the one that suits your routine.
This page
AHK-Cu + GHK-Cu Hair Serum Pro
$185 a bottle
$6.17 a day · lasts about 30 days
- AHK-Cu per bottle
- 2,400 mg target
- GHK-Cu per bottle
- 2,400 mg target
- Formula
- Dual copper peptide
- Format
- Leave-on scalp serum
- Daily routine
- Morning and night
Suits you if you specifically want AHK-Cu and GHK-Cu together in one leave-on scalp formula.
A subscription, delivered every month. Pause or cancel any time.
AHK-Cu Copper Peptide Hair Serum 4800mg
$229 a bottle
$7.63 a day · lasts about 30 days
- AHK-Cu per bottle
- 4,800 mg
- GHK-Cu per bottle
- None
- Formula
- Pure AHK-Cu
- Format
- Leave-on scalp serum
- Daily routine
- Morning and night
Suits you if you want Neurogan Health's highest-concentration pure AHK-Cu scalp serum.
GHK-Cu Hair & Scalp Serum
$55 a bottle
$0.92 a day · lasts about 60 days
- AHK-Cu per bottle
- None
- GHK-Cu per bottle
- 2,400 mg
- Formula
- Pure GHK-Cu
- Format
- Leave-on scalp serum
- Daily routine
- Once a day
Suits you if you want a GHK-Cu-only leave-on scalp formula.
30-day money-back guarantee
Bottle life assumes the suggested use and depends on how much you spray.
What customers say
Reviews marked Verified Buyer are from confirmed purchases. Customer reviews describe individual experiences with this product and should not be interpreted as clinical evidence. Every review is shown.
Individual results vary. Customer experiences, not a clinical study.
Questions we hear most often
AHK-Cu and GHK-Cu are different copper-binding tripeptides with different research histories. This formula includes both for users who specifically want a dual-peptide scalp serum. No human trial has established that the combination is clinically superior to either peptide alone.
The product is formulated and labeled with 2,400 mg of AHK-Cu and 2,400 mg of GHK-Cu per 2 oz bottle, for 4,800 mg total copper peptides.
That has not been established clinically. Choose Serum Pro if you specifically want both peptides; choose AHK-Cu 4800mg if you want a pure AHK-Cu formula.
This finished serum has not been shown in a controlled human clinical trial to regrow hair. AHK-Cu has experimental hair-follicle research, while GHK has a separate research history.
Apply it to clean, dry scalp, massage gently for 30 to 60 seconds and leave it on. The current product directions call for morning and evening use.
There is no clinically established results timeline for this finished AHK-Cu + GHK-Cu serum.
The characteristic blue color comes from the copper-peptide complexes themselves.
The product is deeply colored. Allow it to dry before contact with light-colored fabrics. Individual application amounts and fabrics vary.
There is no clinically established universal dual-peptide + minoxidil protocol. If you use a drug treatment for hair loss, ask a healthcare professional or pharmacist if you're unsure how another scalp product fits into your routine.
There is no controlled human study establishing the safety or benefit of applying this dual-peptide serum to freshly microneedled scalp.
Any topical product can cause irritation or sensitivity in some users. There is no comprehensive human safety profile for this exact dual-peptide serum.
No. This is a topical cosmetic hair and scalp serum.
Available reports are linked in the Lab Results section and through Neurogan Health's Lab Results page.
Still have a question?
Talk to us
Start with one bottle or subscribe and save 20%
2,400 mg of AHK-Cu and 2,400 mg of GHK-Cu in distilled water, in a 2 oz (60 mL) bottle.
Choose your delivery frequency, then change, skip or cancel according to your subscription terms.
Adds a subscription, delivered every month, about one bottle per delivery.
30-day money-back guarantee