Men's Hair Tonic
Two copper peptide formulations. Same dual-peptide approach. No alcohol, no botanicals, no DHT blockers.
Topical peptides backed by published research.
Pick your copper peptide. Apply 2-3 drops to scalp once daily. That is it.
Choose Your Copper Peptide
Both formulations pair a copper peptide with Acetyl Tetrapeptide-3. Pick the copper peptide variant that fits.
GHK-Cu Hair Tonic
The naturally occurring copper peptide. Decades of research.
- 1% GHK-Cu (Copper Tripeptide-1)
- 1% Acetyl Tetrapeptide-3
- Naturally occurring in human plasma
- No DHT blockers or hormones
- 30-second daily routine
AHK-Cu Hair Tonic
The synthetic variant. Hair-follicle research focus.
- 1% AHK-Cu (Copper Tripeptide-3)
- 1% Acetyl Tetrapeptide-3
- Synthetic variant of GHK-Cu
- Research focused on hair follicles
- 30-second daily routine
Not sure which? Many customers start with GHK-Cu for the deeper research history, then try AHK-Cu later. The dual-peptide system and the carrier base are identical otherwise.
The Peptides Behind Both Hair Tonics
The two hair tonics differ only in their copper peptide variant. The second peptide (Acetyl Tetrapeptide-3) and the carrier base are identical. Choose the copper peptide that fits your preference, the rest of the formulation is the same.
Research published in the International Journal of Molecular Sciences describes copper peptides and their role in tissue processes and follicle-level cellular signaling examined in clinical literature.
GHK-Cu (Copper Tripeptide-1)
The naturally occurring copper peptide, found in human plasma at birth and declining with age. Studied as both a signal peptide and a carrier peptide for tissue remodeling and collagen production pathways. Decades of skin and hair research backing.
AHK-Cu (Copper Tripeptide-3)
The synthetic variant. Alanine swaps for glycine in the amino acid chain, with research focused specifically on hair follicle applications. Same copper peptide family as GHK-Cu, with research that targets follicle-level mechanisms more directly.
Acetyl Tetrapeptide-3
The biomimetic peptide paired with both copper peptides at 1%. Examined in research for cellular signaling at the dermal papilla, the foundation of hair follicles. This is the second peptide in our dual-peptide system, identical across both Hair Tonic formulations.
HOW TO USE YOUR COPPER PEPTIDE HAIR TONIC
30 seconds, once a day. Same method for either product.
Both GHK-Cu and AHK-Cu Hair Tonic apply the same way. Clean, dry scalp, 2-3 drops massaged into areas of concern, no rinsing.
Work on dry or damp hair. Create sections to expose the scalp.
Dispense directly onto scalp. Massage with fingertips into areas of concern.
Do not rinse. Style as usual. Use morning and/or night.
Verified Customers
Real Results from Real Customers
"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!!"
"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."
"I've been using this for a few weeks and I'm honestly impressed. My hair looks noticeably fuller, and I can feel new growth coming in. Plus, it doesn't leave any greasy residue."
"This serum is outstanding, and it has the science to back it up. I highly recommend it to someone with thinning hair that is looking for a product that works."
What to Expect
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.
Hair Tonic FAQs
What is the difference between GHK-Cu and AHK-Cu Hair Tonic?
Both are copper peptides with the same histidine-lysine-copper structure. GHK-Cu (Copper Tripeptide-1) is naturally occurring in human plasma and has decades of skin and hair research backing. AHK-Cu (Copper Tripeptide-3) is a synthetic variant where alanine swaps for glycine in the amino acid chain, with research focused specifically on hair follicle applications. The rest of each formulation is identical: 1% copper peptide plus 1% Acetyl Tetrapeptide-3 in the same clean five-ingredient base.
Which one should I use?
If you want the more widely studied option with the longest research history across both skin and hair, start with GHK-Cu Hair Tonic. If you specifically want the variant with research focused directly on hair follicle applications, choose AHK-Cu Hair Tonic. Both deliver the same Acetyl Tetrapeptide-3 pairing in the same carrier base, and the application is identical: 2-3 drops to scalp once daily. Many customers start with GHK-Cu and try AHK-Cu later.
How is this different from a traditional hair tonic like Clubman or Vitalis?
Traditional barbershop hair tonics (Clubman Pinaud, Vitalis, Reuzel) are alcohol-based products formulated for fragrance and light styling hold. Our Hair Tonic is a peptide-based scalp treatment, not a styling product. There is no alcohol burn, no botanical fillers, no fragrance. Apply it to clean scalp first, let the peptides absorb, then layer any styling products you normally use.
Is this a DHT blocker or hormone treatment?
No. We do not include DHT blockers (such as Finasteride) or any hormonal compounds. PLU Laboratories sells cosmetic products, not FDA-approved drugs, so we cannot make claims about treating hair loss or medical conditions. The dual-peptide system is studied for supporting the appearance of scalp health and hair density through cellular signaling pathways examined in published research.
How do I apply it?
Apply 2-3 drops directly to a clean, towel-dried scalp once daily. Massage gently into areas of concern with your fingertips. No rinsing required. The application is the same for both GHK-Cu and AHK-Cu Hair Tonic. Most users do this once daily either morning or night, and can layer any other hair care or styling products afterward.
Can I use Hair Tonic with other products?
Yes. Apply Hair Tonic to clean scalp first and allow the peptides to absorb (about 30 seconds). Then layer hair oil, hair styling gel, hair spray, texture spray, or any other grooming products you normally use. The peptides need direct scalp contact, so apply Hair Tonic before anything else.
How long until I see results?
You will likely notice subtle differences in scalp comfort and hair appearance within 3-4 weeks of consistent daily use. More noticeable changes in hair density appearance typically become visible around 6-8 weeks, with continued progress through 8-12 weeks. See the timeline above for the week-by-week breakdown. Individual results vary, and consistency is more important than starting intensity.
Is it safe for sensitive scalp? Can I dye my hair while using it?
Both formulations are free of alcohol, parabens, sulfates, fragrance, and botanical extracts that commonly trigger sensitivity. We still recommend patch testing on a small area of scalp first if you know you have reactive skin. As for dye, the application is at the scalp level (not the hair shaft), so it does not interfere with hair coloring routines. Apply Hair Tonic to a clean scalp on days that are not immediately around a coloring appointment.
Two Copper Peptides. One Daily Routine.
Pick the copper peptide that fits, apply 2-3 drops to scalp once daily, and watch the timeline above play out over 6-8 weeks. No alcohol, no botanicals, no hormones. Just the peptide concentrations studied in research and 30 seconds of your time.
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