“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.
Verified buyer
Copper Peptide Hair Tonic with GHK-Cu and Acetyl Tetrapeptide-3
Key Benefits
Supports Hair Density Appearance
Enhances Hair Look
Supports Scalp Health
30-day returns, free return shipping
Free shipping on orders $30+
Third-Party Lab Verified
Made in the USA
Just 5 Ingredients
Never Tested on Animals
Just 5 ingredients.
GHK-Cu. Acetyl Tetrapeptide-3. Water. Glycerin. Phenoxyethanol.
Two clinically studied peptides. Two carriers to deliver them. A gentle preservative. No fragrance, no dyes, no botanical extracts. Both peptides verified at 1% by LC-MS in the finished bottle, at or above label claim, at the University of Illinois at Chicago.
Visible results typically appear within 6-8 weeks of consistent daily use. Individual results may vary.
Ships within the United States. Also available on Amazon.com
GHK-Cu | Copper Peptide Hair Tonic for Fuller-Looking Hair
Sale price$39.99
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GHK-Cu | Copper Peptide Hair Tonic for Fuller-Looking Hair
Sale price$39.99
Independently Tested
Third-Party Lab Verified
Every formula is tested by the Mass Spectrometry Core at the University of Illinois at Chicago. Actives verified by LC-MS in the finished bottle, at or above label claim. Heavy metals screened by ICP-MS. Reports published.
Concentration (LC-MS)
Purity
Heavy Metals (ICP-MS)
See latest test results +
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peptide actives
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verified review average
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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.
“Doesn't weigh my hair down”
Easy to apply, doesn't weigh down my hair or make it look oily.
Verified buyer
“Healthier and fuller”
I can already feel my hair getting healthier and fuller.
Verified buyer
“The science to back it up”
This serum is outstanding, and it has the science to back it up.
Verified buyer
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 and backed by a 30-day money-back guarantee.
The actives
Two peptides. One job.
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%.
The formula
Everything you need. Nothing you don't.
No DHT blockers. No hormonal ingredients. No parabens, sulfates, or fragrance. Both peptides verified at 1% by an independent university lab.
The routine
30 seconds. Once a day.
Part your hair. Apply 2-3 drops directly to the scalp. Leave in and style as usual.
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
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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 CloseIt 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.
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1%Peptide active
Acetyl Tetrapeptide-3
A biomimetic peptide, included for the appearance of hair density. More on this CloseIt sits at the same 1% as the GHK-Cu, so neither active is a dusting on the label.
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Water
The base. Water based, so nothing sits on the scalp. More on this CloseNo oils and no silicones, which is why it absorbs in seconds and leaves nothing to rinse out.
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Glycerin
A humectant. It carries the peptides and helps the scalp hold on to moisture. More on this CloseIt is the reason two or three drops spread across the part without leaving a film on the hair.
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Phenoxyethanol
A gentle preservative, so what is in the bottle stays safe to use. More on this CloseOne 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
Expected Progress
What to Expect From Our Copper Peptide Hair Serum
1-2
Weeks 1-2
Scalp feels healthier with improved comfort
3-4
Weeks 3-4
Hair appears smoother with improved shine and less shedding
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.
Why PLU
Verified, not claimed.
Just 5 ingredients. And a lab report to prove it.
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 reportsMade in the USA, 30-day returns
Formulated and produced domestically, backed by a 30-day money-back guarantee.
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.
Our copper peptide hair serum vs a leading competitor
A Leading Competitor | Copper Peptide Hair Product
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ingredients
PLU Laboratories | GHK-Cu Hair Tonic
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ingredients
That's it.
Key Benefits of Copper Peptides For Hair
Our serum contains GHK-Cu + Acetyl Tetrapeptide-3 at concentrations mirroring published research for visible improvements in hair density appearance and scalp health. Benefits include:
Supports Hair Appearance
GHK-Cu copper peptide supports scalp's natural processes for fuller-looking hair and improved density appearance
Enhances Hair Look
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
GHK-Cu vs AHK-Cu
| GHK-Cu (This Product) | AHK-Cu | |
|---|---|---|
| Full Name | Copper Tripeptide-1 | Copper Tripeptide-3 |
| Amino Acids | Glycine, Histidine, Lysine | Alanine, Histidine, Lysine |
| Occurs Naturally | Yes (human plasma) | No (synthetic variant) |
| Research Focus | Skin + Hair | Primarily Hair |
| PLU Product | GHK-Cu Hair Tonic | AHK-Cu Hair Tonic |
Frequently Asked Questions
What does the research on copper peptides say about hair?
Copper peptides are among the most studied peptides in cosmetic science. Published research on GHK-Cu and Acetyl Tetrapeptide-3 has looked at scalp health and the appearance of hair density. PLU Laboratories makes cosmetic products, not drugs, so we do not make hair-growth claims.
Our Hair Tonic pairs both peptides at the 1% concentrations studied in that literature. Read the research on our blog.
Is copper peptide a DHT blocker?
No. We don’t include any DHT blockers (like Finasteride), either. These types of ingredients can have harmful hormonal effects, and we prefer to support scalp and hair health naturally. Our dual-peptide system may be all you need to unlock your healthiest, happiest hair yet!
Do I apply the serum to my hair or scalp?
Apply it to the scalp directly, not hair strands. The scalp is where the formula needs to reach. Applying the copper peptide hair serum to strands will just leave you looking greasy without any meaningful impact on hair health. For best results, massage it into the scalp for 30-60 seconds. This may boost circulation and absorption. Focus on trouble areas.
Are copper peptides safe to apply on the scalp?
Yes. Our formulation is free of parabens, sulfates, fragrance, and dyes. However, we recommend patch testing on a small area first - as with any new scalp product. You may want to consult with a dermatologist before use if you have specific scalp concerns, too.
What are the side effects of copper peptides?
Fortunately, there aren’t really any known side effects of copper peptides for hair. They’re generally considered safe for most people - just like our dual-peptide face serum (copper peptides for skin).
How long does it take for copper peptides to work on hair?
You’ll likely notice a subtle difference in hair appearance and shine within 3-4 weeks of consistent daily use. More significant changes in hair density appearance typically become visible around 6-8 weeks. We encourage you to apply Hair Tonic daily for at least 8-12 weeks.
How often do I need to apply copper peptides for hair?
Once a day is fine. Copper peptide serum requires consistency, though. Do your best to avoid missing a day, or you’re going to delay progress.
Can all hair types benefit from a copper peptide hair serum?
Yes, it’s designed to work across various hair types and textures. The serum supports scalp health and follicle appearance. Customers with straight, wavy, curly, and coily hair have all reported positive results.
From the PLU blog
Copper Peptides For Rosacea: Does GHK-Cu Help With Rosacea?
Living with rosacea means wondering what’ll cause your next flare-up. So often, the very products you choose to help keep your skin feeling calm can backfire and cause more harm than good. This is...
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Copper Peptides For Scalp: Is a Copper Peptide Scalp Treatment Worth It?
Most people forget that the scalp is skin, which is why using copper peptides for scalp health is so powerful. These little messenger molecules can help encourage healthy hair growth by creating th...
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GHK-Cu for Loose Skin: Does GHK-Cu Help With Loose Skin?
Whether you lost a ton of weight and now have saggy skin or you’ve just noticed that age has cost you the firmness your skin used to have, it can take a toll on your self-confidence. The good news ...
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