All Products
What to Expect
Weeks 1-2
Skin feels smoother with improved texture and comfort
Weeks 3-4
Visible improvements in skin tone evenness and firmer appearance
Weeks 6-8
Notable reduction in fine lines with improved elasticity
Weeks 8-12
Skin texture continues improving, fine lines less prominent
Weeks 12+
Ongoing support for firmer, smoother skin with daily use
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.
All PLU Laboratories Products
Multi-peptide formulations at meaningful concentrations. GHK-Cu copper peptides combined with complementary amino acid technologies for skin and hair appearance.
Why Multi-Peptide Systems Outperform Single-Peptide Serums
Most peptide serums contain either GHK-Cu OR other peptides, rarely both. Many dilute their active ingredients with hyaluronic acid, vitamin C, or botanical extracts, reducing the peptide concentrations studied in clinical research.
PLU Laboratories combines complementary peptide technologies at concentrations examined in published literature. Our Face Tonic pairs GHK-Cu (signal and carrier peptides) with Palmitoyl Tripeptide-1 and Palmitoyl Tetrapeptide-7 (matrikine signal peptides) for skin appearance. Our Hair Tonic pairs GHK-Cu with Acetyl Tetrapeptide-3 (biomimetic follicle-support peptides) for hair appearance.
No hyaluronic acid, vitamin C, or DHT blocker dilution. Just the peptide concentrations studied in research. Learn more about our approach on our best copper peptide serum guide.
Our Multi-Peptide Products
Three focused formulas. Six ingredients or less, every time.
GHK-Cu Hair Tonic
$39.99 Discovery size
Shop Hair Tonic
GHK-Cu Face Tonic
$39.99 Discovery size
Shop Face Tonic
AHK-Cu Hair Tonic
$59.99 Discovery size
Shop AHK-CuShop by Category
Copper Peptide Serum
Multi-peptide serums combining GHK-Cu with complementary peptides
Browse CollectionPalmitoyl Peptide Serum
Matrikine peptide formulas for skin firmness and texture appearance
Browse CollectionFrequently Asked Questions
What makes PLU Laboratories different from other peptide brands?
PLU Laboratories focuses on multi-peptide systems at meaningful concentrations without filler ingredient dilution. Most peptide serums contain either GHK-Cu OR other peptides, and many dilute peptides with hyaluronic acid, vitamin C, or botanical extracts.
Our approach combines complementary peptide technologies: GHK-Cu (signal and carrier peptides) + Palmitoyl Peptides (matrikine signal peptides) for skin, or GHK-Cu + Acetyl Tetrapeptide-3 (biomimetic peptides) for hair. This maintains the concentrations examined in clinical research. Learn more on our best copper peptide serum guide.
Should I use Face Tonic, Hair Tonic, or both?
Face Tonic: If you're targeting skin firmness appearance, fine lines, or skin texture, our copper peptide face serum combines GHK-Cu with Palmitoyl Peptides for comprehensive skin appearance support.
Hair Tonic: If you're targeting hair density appearance or scalp health, our copper peptide hair serum combines GHK-Cu with Acetyl Tetrapeptide-3 for follicle-level support.
Both: Many users apply both products daily for comprehensive peptide support across face and scalp. Both together take under 60 seconds total.
How do I use these products in my routine?
Face Tonic: Apply 2-3 drops to clean, dry facial skin once daily. The formula absorbs quickly. Layer hyaluronic acid or moisturizer after if desired.
Hair Tonic: Apply 2-3 drops to clean, towel-dried scalp once daily. Gently massage for absorption. No rinsing needed.
Both products are designed for maximum efficiency: under 30 seconds each. For comprehensive guidance, explore our face serum for men and men's hair tonic collections.
Why don't PLU products include hyaluronic acid or vitamin C?
The clinical research on GHK-Cu, Palmitoyl Peptides, and Acetyl Tetrapeptide-3 examined these peptides as focused complexes, not diluted with hyaluronic acid, vitamin C, or other actives in the same formulation. Adding these ingredients reduces the peptide concentrations studied in published literature.
Our products maintain meaningful peptide concentrations by focusing exclusively on complementary peptide technologies. If you want hyaluronic acid or vitamin C, apply them separately after the peptides absorb to maintain peptide efficacy. Learn more about our formulation philosophy on our copper peptide serum page.
How long do PLU products last?
We sell our products in both a 4 and 12 week supply (0.33 fl oz and 1 fl oz). We recommend using the entire bottle within a year, but feel you won't have any issue once you see the effects on your skin and hair.
The lightweight formulations absorb quickly, so a little goes a long way. Most users find 2-3 drops sufficient to cover the entire face or target scalp areas. Both GHK-Cu products are designed for efficient daily use.
Are these products suitable for sensitive skin?
Research suggests peptides are generally well-tolerated across different skin types due to their amino acid-based mechanisms. Our formulations focus on peptide delivery without harsh ingredients, parabens, or sulfates.
However, individual sensitivities can vary. We recommend patch testing any new product before full application. If you have concerns about ingredient compatibility with existing skin conditions, consult healthcare providers before use. Contact us at productteam@plulaboratories.com with specific questions.