GHK-Cu | Copper Peptide Hair Tonic for Fuller-Looking Hair

GHK-Cu Hair Tonic key benefits: supports scalp health, supports fuller-looking hair, 30+ years of research

PLU Hair Tonic with Blue Liquid Background

Copper Peptide Hair Tonic with GHK-Cu and Acetyl Tetrapeptide-3

Name: GHK-Cu | Copper Peptide Hair Tonic for Fuller-Looking Hair
Rating: 4.48 (23 reviews)

Both Peptides Verified at 1% by a 3rd Party Lab

Third-Party Lab Verified View lab reports

Key Benefits

Supports Scalp Health

Supports Fuller-Looking Hair

30+ Years of Research

Size:

Full Size (30 mL) Discovery Size (10 mL)

Best for: a first trial to see how the tonic fits your routine. We recommend the Full Size for ongoing daily use. Early changes typically start after 6 to 8 weeks and keep building with consistent use.

Variant

Discovery SizeBest for a first trial, to see how the tonic fits your routine. For visible changes, we recommend the Full Size. Early changes typically start to show after 6 to 8 weeks of daily use.

Choose your plan

PLU vs a typical hair serum

PLU Typical hair serum

Ingredients on the label 5 20+

Named peptide actives Varies

Concentrations disclosed Independently verified Rarely

Finished bottle tested by an independent lab Rarely

Public lab report Rarely published

Filler actives None Common

PLU Copper Peptide Hair Tonic, 5 ingredients

Water
Glycerin
Copper Tripeptide-1
Acetyl Tetrapeptide-3
Phenoxyethanol

See a typical hair serum's full ingredient list

Aqua
Butylene glycol
Polyamino sugar condensate
Panthenol
Biota orientalis leaf extract
Glycine soja (Soybean) germ extract
Panax ginseng root extract
Copper tripeptide-1
Biotin
Triticum vulgare (Wheat) germ extract
Serenoa serrulata fruit extract
Scutellaria baicalensis root extract
Myristoyl pentapeptide-4
Polyacrylate crosspolymer-6
1,2-Hexanediol
Hydroxyacetophenone
Sodium hyaluronate
Peg-40 hydrogenated castor oil
Allantoin
Disodium EDTA

5 ingredients

2 peptide actives

4.5/5+ verified review average

30s once-a-day routine

Real customers, real routines

Verified reviews from PLU customers

Five ingredients. Independently verified.

Every batch is third-party tested, and the report is published right on this page.

“Noticeably fuller”

My hair looks noticeably fuller, and my scalp feels healthier overall. It's lightweight, easy to use, and I actually look forward to applying it.

Chris L.

Verified buyer

A customer applying the GHK-Cu Hair Tonic at his hairline

“Doesn't weigh my hair down”

Easy to apply, doesn't weigh down my hair or make it look oily.

Gina R.

Verified buyer

“Healthier and fuller”

I can already feel my hair getting healthier and fuller.

Max O.

Verified buyer

“The science to back it up”

This serum is outstanding, and it has the science to back it up.

Mike S.

Verified buyer

A creator holding the GHK-Cu Hair Tonic with the dropper raised

Treat the scalp, not just the hair

The scalp is skin. Fuller-looking hair starts with the skin it grows from.

Thousands of orders shipped

Made in the USA. 30-day returns, even if you've opened it.

5 stars: 17 (74%)
4 stars: 4 (17%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 2 (9%)

I’ve just started using this product, but from the three weeks of me using this, already I can tell a difference at the crown of my hair. It’s thicker, but not where I’d like it just yet. Granted I’ve only been on three weeks.

Hey There,

Thanks for the update and review 3 weeks in! Keep us posted with an update in the future, excited to see how things progress for you!

Cheers,

The PLU Laboratories Team

Late 20s (M) here. I started using this product a couple of weeks ago, and so far, it has been working well. I’ve noticed that my hairline has held strong, and I haven’t experienced any further hair loss. I think it may even be helping me grow some new hair around my temples.

I was also pleasantly surprised to find that I haven’t experienced any scalp redness or irritation. Other brands have sometimes caused irritation, but I’ve had no issues with this one.

I’m excited to see what results I get as I continue using this GHK-Cu serum over the coming weeks and months. Based on my experience so far, I’m optimistic that it will continue to deliver good results.

It’s also worth mentioning that I haven’t experienced any of the negative side effects I’ve previously associated with hair-loss medications. Overall, I’m very happy with this serum and look forward to seeing how my hair responds with continued use.

Peter,

Thanks for sharing your update - keep us posted on your results!

Cheers,

The PLU Laboratories Team

I’ve been using this copper peptide tonic for almost two months now, and I’m already seeing so many baby hairs! I’m honestly loving it. My hair looks like it’s starting to grow in, and I’m so happy with the results so far. Definitely excited to keep using it and see how much more improvement I notice!

Hi there!

Thanks for sharing your feedback, great to see your progress!

Keep us posted as you continue.

Best,

The PLU Laboratories Team

It’s very good. I’ve seen growth in my hairs on my hair line and shedding has decreased

HI there!

Thanks for sharing your results, glad to hear this has been helpful for you! We're looking forward to hearing how things progress!

Best,

The PLU Laboratories Team

I didn't really see a difference at first, but after using it for some time I see small changes. The hair on the crown of my head seems to be getting fuller and more lengthy. I am sure with continuous use it will prove to be worth it.

I received this product four weeks ago and have been using it once in the morning and once at night. I have started to see some hair growth in certain areas.

Debbie,

Great to hear you're seeing early results! Keep us posted with progress.

Best,

The PLU Laboratories Team

This stuff is incredible. I used on my eyebrows and after two months they are noticably thicker and fuller. Hair tonic works better than anything I’ve tried in the past.

Lourdes, thanks for the kind review! We're glad our product helped you.

Cheers,

The PLU Laboratories Team

Only a couple weeks in, so far so good. Stops that “burning scalp” feeling the second it hits your skin

EDIT:
Compare March 25th to today (May 7th) loooks like some density improvement. We’ll keeping and see how it goes !

Great to hear our product has helped! Keep us posted on your progress.

Cheers,

Rob

Easy to apply, doesn't weigh down my hair or make it look oily. I've only used it a couple weeks, so too early to know if it's helping, but I am shedding less!

Gina, thanks for the review! Keep us posted on your results!

I see visible increase in density of hair on the portion of the top of my head after 1 month application of GHK-Cu. This area was not seeing any effects after months of using Musely and HappyHead solutions though other areas on the periphery of the head were seeing growth.

See the before and after pics.

Fantastic results, Sujoy! Thanks for sharing with us.

1st month in and I look forward to using it everyday.

Hi Tyler, we're delighted to hear you're enjoying the product!

Thank you for sharing your experience - keep us posted on your results.

Best,

The PLU Laboratories Team

TO LITTLE PRODUCT FOR THE PRICE. IT DID NOT LAST A MONTH. I did not have enough product to tell if it really works. MY PRESCRIPTION is cancelled. Give more product for the price. Plus, I only used it in two spots, I did not see a difference.

Hello Yves,

We're sorry to hear you did not see enough value in the discovery size product. We'll reach out directly via email to address your concern!

Best,

The PLU Laboratories Team

I am seeing some results now. Very happy so far

Steve,

Thrilled to hear you're seeing results! Keep us posted on your progress.

Best,

The PLU Laboratories Team

I absolutely love this tonic! I’ve been using it consistently on my scalp, especially through my crown area, and I’m so happy I added it to my routine. It’s incredibly easy to use, lightweight, and doesn’t leave my hair feeling greasy or weighed down. I’m really encouraged by what I’m seeing so far and will definitely continue using it. Five stars from me!

Joy, thanks so much for the review, we're thrilled to hear you're seeing good early results. Please keep us posted on your journey!

Cheers,

The PLU Laboratories Team

Good product .

Thank you, Barry! We're glad you enjoyed our product!

Best,

The PLU Laboratories Team

So far I have no complaints have been using for a few weeks and starting to see some baby hairs.. So all in all its doing something..

Robert,

Great to hear! Let's see those baby hairs grow!

Keep us posted on your progress.

Best,

The PLU Laboratories Team

Waiste of money

Nathan,

We're sorry to hear you didn't feel our product was a good value. We've reached out via email to see if there's anything we can do to help!

Cheers,

The PLU Laboratories Team

This serum is outstanding, and it has the science to back it up. I highly recommend it to someone with thinning hair.

Mike, thanks for your review! Glad to hear you love the product.

Been working great, slow and steady growth!

Thanks, Jeremy! We're glad to hear you've seen steady results

This hair tonic doesn’t leave any residue or mess like minoxidil does. Even though I’ve only used it for about a month, I can already feel my hair getting healthier and fuller.

Great to hear, Max! Thanks for being a customer.

I've always had trouble growing facial hair and decided to try this product on my mustache for Movember. By the end of the month I had a full looking mustache that received many compliments. I give it 5 stars, my girlfriend gives it 6.

We're glad we could help you get the mustache you always dreamed of, Robert!

I’ve been using this for a few weeks and I’m honestly impressed. My hair looks noticeably fuller, and my scalp feels healthier overall. It’s lightweight, easy to use, and I actually look forward to applying it. Really happy with the results so far.

I purchased the tonic to improve hair growth and to counteract thinning near the top of my head. Since then, I have visibly improved coverage, materially less shedding, and an excess of confidence. My old lady even noticed and questioned if my stylist had tried something new!! I am obligated to recommend this to those seeking a solution.

What you're putting on your scalp

Five ingredients, each with a job.

Two peptide actives at 1% each, and three ingredients to carry them and keep them stable.

5

The two that do the work

1%Peptide active
GHK-Cu Copper Tripeptide-1
The copper peptide studied in skincare for decades, here for the look of your scalp and hair. More on this Close
It is the same peptide people buy for their face. We put it where the hair starts instead, at a full 1%, and the concentration is confirmed by an outside lab.
1%Peptide active
Acetyl Tetrapeptide-3
A biomimetic peptide, included for the appearance of hair density. More on this Close
It sits at the same 1% as the GHK-Cu, so neither active is a dusting on the label.

Plus three that carry them

Water
The base. Water based, so nothing sits on the scalp. More on this Close
No oils and no silicones, which is why it absorbs in seconds and leaves nothing to rinse out.
Glycerin
A humectant. It carries the peptides and helps the scalp hold on to moisture. More on this Close
It is the reason two or three drops spread across the part without leaving a film on the hair.
Phenoxyethanol
A gentle preservative, so what is in the bottle stays safe to use. More on this Close
One preservative at a low level, the standard choice for water based cosmetics.

Ingredients (INCI)

Water, Glycerin, Copper Tripeptide-1, Acetyl Tetrapeptide-3, Phenoxyethanol

Independently verified. See the test results.

What is not in it

No fragrance
No dyes
No hormones
No DHT-blocker gimmicks
No botanical extracts

1-2

Weeks 1-2

Scalp feels healthier with improved comfort

3-4

Weeks 3-4

Hair appears smoother with improved shine

6-8

Weeks 6-8

Visible improvements in hair density and scalp health

8-12

Weeks 8-12

Hair appears noticeably thicker and fuller

12+

Weeks 12+

Ongoing support for fuller, denser hair with daily use

Individual results may vary. Research on copper peptides, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, and Acetyl Tetrapeptide-3 noted visible improvements within study timeframes with consistent use of peptide complexes.

Six ingredients or fewer

Two peptides, two carriers, one preservative. Every one earns its place.

Tested in the finished bottle

1% GHK-Cu and 1% Acetyl Tetrapeptide-3 verified by LC-MS at the University of Illinois at Chicago, at or above label claim. Heavy metals screened by ICP-MS.

Read the lab reports

Made in the USA, 30-day returns

Formulated and produced domestically, with 30-day returns.

How to Use PLU Hair Tonic

Effective peptides in 30 seconds.
No complicated steps, no guesswork.

Application Steps

1 Part +

Works on dry or damp hair. Create sections to expose scalp.

2 Apply +

Dispense directly onto scalp. Use fingertips to massage into areas of concern.

3 Leave In +

Do not rinse. Style hair as usual. Use morning and/or night.

After applying the product to your scalp, massage it in with your fingertips. A 1-2 minute scalp massage helps work the serum in.

Give the serum about 60 seconds to absorb before following up with any other products in your haircare routine. Or, before lying down in bed and letting your head hit the pillow. You don’t want the serum to rub off before it has a chance to work.

Consistency is everything with our GHK-Cu hair tonic. It takes weeks of daily application before the early signs of progress appear, so stick with it, and don’t skip any days.

What Can Our GHK-Cu Hair Serum Do?

GHK-Cu supports the scalp's natural processes for fuller-looking hair. Acetyl Tetrapeptide-3 supports follicles and how hair appears with consistent use. Both verified at 1%, so you’re getting real support rather than a watered-down formula that overpromises and underdelivers.

Supports Hair Appearance

GHK-Cu copper peptide supports scalp's natural processes for fuller-looking hair and improved density appearance

Fuller-Looking Hair

Acetyl Tetrapeptide-3 helps improve how hair appears with consistent use and follicle support

Scalp Health Support

Designed to help maintain healthy-looking scalp conditions and follicle appearance

Concentrations That Matter

Peptide concentrations formulated to match published research on hair appearance

Overview of GHK-Cu

This copper peptide (glycine, histidine and lysine holding a copper ion) occurs naturally in the human body. It’s been studied for over 50 years, and we know more about its potential than any other copper peptide. It’s the same peptide in our GHK-Cu face serum, and it has been studied for hair, too.

Research shows the amount of GHK-Cu in blood plasma falls as we get older.

What Does the Research Say About GHK-Cu For Hair?

Uno & Kurata (1993): Journal of Investigative Dermatology. A copper-binding peptide produced similar follicular enlargement to topical minoxidil.
Pickart, Vasquez-Soltero & Margolina (2015): BioMed Research International. GHK appeared to modulate as many as 4,000 human genes, including pathways linked to tissue remodeling, stem cell activity, and follicle-related signaling.
Pickart & Margolina (2018): International Journal of Molecular Sciences. Reviewed GHK-Cu's regenerative properties and noted how plasma GHK-Cu concentration declines by over 60% between young adulthood and age 60, which correlates with visible changes in hair and skin appearance over time.

Who Is This For?

This is for you if...

You've noticed thinning, a widening part, or a hairline starting to recede, and you want to act on it early.
You want a simple five-ingredient formula with no DHT blockers, hormones, or fragrance.
You can commit to once-a-day use and give it a few months. Early changes typically start around 6 to 8 weeks and build from there.

This isn't for you if...

You're expecting visible change in under 6 weeks. Peptides work gradually.
You're looking for a one-bottle fix. Results come from consistent daily use over months, not a single bottle.
You want a DHT blocker or a minoxidil alternative. This is neither. It's a scalp-support formula. Ask your dermatologist about using it alongside a treatment.

Frequently Asked Questions

Does GHK-Cu work for hair growth? +

It’s one of the most studied copper peptides. Research published in the International Journal of Molecular Sciences shows it can support the hair follicle environment, which may improve the appearance of hair density.

Can GHK-Cu make my hair look thicker? +

Yes. Consistently using GHK-Cu can lead to the appearance of thicker, fuller-looking hair. Our co-founder applied GHK-Cu every day for four years and was blown away by the changes that took place. This is why we created PLU Laboratories. Countless customers have experienced their own success stories, as you can see from the reviews on this page. The research backs it up, too.

How long does it take for GHK-Cu to help hair? +

At least 3-4 weeks of daily use, but more realistically, 6-8 weeks of daily use. Hair changes slowly, so don’t expect overnight results. Staying consistent, massaging the serum into your scalp, and dialing in the rest of your hair care regimen all help.

How do I use GHK-Cu hair serum? +

Apply 2-3 drops directly to your scalp and then massage the serum in using your fingertips. The massage aspect is very critical, as it helps improve absorption. Don’t rinse it out. Do this every day.

Is it better to apply GHK-Cu hair serum in the morning or before bed? +

We prefer to use GHK-Cu for hair before bed, but you can do it in the morning, too. Consistency is the only non-negotiable. When you use it matters less than the simple fact that you DO use it.

Does my scalp need to be dry or wet for GHK-Cu application? +

Slightly damp is ideal, but dry is perfectly fine too. Just don’t apply it soaking wet. Excess water will only dilute the formula before it has time to absorb.

Should I rinse/wash my hair or leave GHK-Cu overnight? +

Don’t rinse it out after applying. It absorbs whenever you apply it, so there’s no need to leave it on overnight. If you apply at night, wash your hair as usual the next day.

Am I supposed to use GHK-Cu serum every single day? +

Yes. Consistency is the biggest variable impacting your results, and skipping days is the most common reason people don’t see the progress they had hoped for. Once a day is fine, but really make an effort to apply our GHK-Cu hair serum daily.

Are there any side effects or downsides to using GHK-Cu for hair? +

Topical copper peptides are generally well tolerated, and our formula is free of parabens, sulfates, fragrance, and dyes. As with any new scalp product, patch test a small area first and stop use if irritation occurs.

Who shouldn’t use GHK-Cu hair serum? +

Skip it if you have a known copper allergy, and check with your doctor first if you’re pregnant or nursing or have a scalp condition.

What should you not mix GHK-Cu with? +

Don’t use GHK-Cu at the same time as direct acids (AHAs/BHAs) or high concentrations of vitamin C serums (L-ascorbic acid). These can mess with the pH environment and thus, break down the peptide’s stability. You can still use these products, but they should be separated from GHK-Cu.

Is GHK-Cu or AHK-Cu better for my hair? +

They’re different. We have a really great AHK-Cu serum as well. We generally advocate using GHK-Cu hair serum first as it has much more evidence. If you don’t see progress after 3-4 months, then it may be worth trying AHK-Cu.

What color is the serum, and does it cause staining? +

We don’t use any dyes at all, so you have nothing to worry about as far as staining goes. This is part of what separates our serum from the alternatives. A lot of the most popular GHK-Cu hair serums on the market have dye in them.

What testing standards does PLU Laboratories use? +

Both active peptides in our formulas are independently verified at the concentrations stated on the label, via LC-MS analysis at the University of Illinois at Chicago’s Mass Spectrometry Core. Heavy metal screening is performed using ICP-MS.

Is there any satisfaction guarantee for GHK-Cu hair serum? +

We offer free returns within 30 days.

Commit to Our GHK-Cu Hair Serum Today

Your journey to thicker-looking hair starts today. Give the PLU Laboratories GHK-Cu Hair Tonic 6-8 weeks of daily use. Place your order today, backed by 30-day returns, and see for yourself what keeps customers coming back for more!

From the PLU blog

Copper Peptides For Hair: Why Everyone is So Excited About GHK-Cu and AHK-Cu

It’s become impossible to ignore the hype around copper peptides for hair. But is it just that - hype? Or is there science behind copper peptides and hair? You’ve come to the right place. The short...

Copper Peptide Hair Tonic with GHK-Cu and Acetyl Tetrapeptide-3

Key Benefits

PLU vs a typical hair serum

Third-Party Lab Verified

Real customers, real routines

Five ingredients, each with a job.

GHK-Cu Copper Tripeptide-1

Acetyl Tetrapeptide-3

Water

Glycerin

Phenoxyethanol

What to Expect From Our Copper Peptide Hair Serum

Verified, not claimed.

How to Use PLU Hair Tonic

Application Steps

What Can Our GHK-Cu Hair Serum Do?

Supports Hair Appearance

Fuller-Looking Hair

Scalp Health Support

Concentrations That Matter

What Does the Research Say About GHK-Cu For Hair?

Who Is This For?

This is for you if...

This isn't for you if...

Frequently Asked Questions

Commit to Our GHK-Cu Hair Serum Today

From the PLU blog