Copper Peptide Hair Tonic with GHK-Cu and Acetyl Tetrapeptide-3
Key Benefits
Just 5 ingredients.
1% GHK-Cu (Copper Tripeptide-1). 1% Acetyl Tetrapeptide-3.
Water. Glycerin. Phenoxyethanol.
Two clinically studied peptides. Two carriers to deliver them. A gentle preservative.
No fillers, no botanicals, nothing added for marketing appeal.
PLU Laboratories GHK-Cu Copper Peptide Hair Tonic is designed to support the appearance of hair fullness with consistent application.
Visible results typically appear within 6-8 weeks of consistent daily use. Individual results may vary.
Ships directly to the USA. Also available on amazon.com domestically and in select international markets.
Shipping/returns
Shipping Information
Free Standard Shipping on orders of $35 or more; orders under $35 ship for a $5.95 flat rate. Orders typically ship within 1-2 business days.
Delivery Time: 3-7 business days for standard shipping
Processing Time: 1-2 business days (Monday-Friday, excluding holidays)
International: We ship within the United States only. International customers can order through our Amazon.com listings.
Order Tracking: You'll receive a tracking number via email once your order ships.
Returns & Exchanges
30-Day Return Policy: You have 30 days after receiving your item to request a return.
Return Eligibility: Unopened, unused items in their original packaging can be returned within 30 days. See our return policy for full details. Opened products are handled on a case-by-case basis - reach out and we will do our best to help.
How to Return:
- Contact us at productteam@plulaboratories.com to initiate return
- We'll provide a prepaid return shipping label
- Follow the return instructions we send you
Refund Processing: Refunds processed within 7-10 business days after we receive your return.
Questions? Contact our team at productteam@plulaboratories.com for any shipping or return questions.
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Independently Tested
Third-Party Lab Verified
All products and active ingredients are tested by an independent research lab at University of Illinois at Chicago. Complete verification, from raw actives to finished product.
See latest test results +
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%.
Everything you need. Nothing you don't.
No DHT blockers. No hormonal ingredients. No parabens, sulfates, or synthetic fillers. Nothing added for marketing appeal.
30 seconds. Once a day.
Part your hair. Apply 2-3 drops directly to the scalp. Leave in and style as usual.
- Water Carrier
- Glycerin Carrier
- GHK-Cu 1% Copper Tripeptide-1, for scalp and hair appearance
- Acetyl Tetrapeptide-3 1% Biomimetic peptide, for hair density appearance
- Phenoxyethanol Preservative
That's it.
Full ingredients (INCI): Water, Glycerin, Copper Tripeptide-1, Acetyl Tetrapeptide-3, Phenoxyethanol
What to Expect From Our Copper Peptide Hair Serum
Weeks 1-2
Scalp feels healthier with improved comfort
Weeks 3-4
Hair appears smoother with improved shine and less shedding
Weeks 6-8
Visible improvements in hair density and scalp health
Weeks 8-12
Hair appears noticeably thicker and fuller
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.
Verified, not implied.
Every active we claim a percentage of is independently verified for concentration at the University of Illinois at Chicago. What is on the label is what is in the bottle.
Independent lab verification
Active concentrations verified at the University of Illinois at Chicago. Identity and concentration, not trace amounts.
Certificates of analysis
Batch-level lab reports for every active we claim.
View lab reportsPeptide research, explained
Articles from the PLU blog on GHK-Cu, AHK-Cu, and the peptides in every formula, with links to the published studies.
Read on the PLU blogHow 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
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 hair growth actually takes place. 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 harsh chemicals, parabens, sulfates, or synthetic fillers. 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
Is GHK-Cu Safe? What Dermatologists Say About the GHK-Cu Safety Profile and Risks
It’s no longer a secret. Copper peptides like GHK-Cu can work wonders for your skin and hair. But is GHK-Cu safe? We get asked this all the time as the most trusted source on copper peptides for sk...
Read more
Can You Use Copper Peptides With Tretinoin?
Tretinoin is one of the most powerful retinoids for treating acne, sun damage, or fine lines - among many other skin concerns. But you’ve probably heard all the buzz about copper peptides, and now ...
Read more
Most of the information you see regarding AHK-Cu dosage is actually borrowed from GHK-Cu research. AHK-Cu is a much newer peptide, but we already know that it has a ton of potential for hair. We d...
Read more