Frequently Asked Questions

Six ingredients: Water, Glycerin, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, 1% GHK-Cu (Copper Tripeptide-1), and Phenoxyethanol. No hyaluronic acid, no vitamin C, no botanical fillers. Just two clinically studied peptide systems at research-grade concentrations.

Apply 2-3 drops to clean, dry facial skin once daily (morning or evening). Allow about 30 seconds to absorb. Layer other products separately if desired, peptides work best when not diluted in the same formulation.

Published research on Palmitoyl Peptides and GHK-Cu typically notes visible appearance changes within 6-8 weeks of consistent daily use. Some users notice improved skin feel within 2-4 weeks; more pronounced firmness appearance develops over 3+ months. Individual results vary.

Both GHK-Cu and Palmitoyl Peptides are generally well tolerated at the concentrations we use. If you are new to copper peptides or have highly reactive skin, patch test on your inner forearm first and start with once-daily use on clean skin. Discontinue if persistent irritation occurs.

Yes, apply them separately rather than mixing. Apply Face Tonic first to clean skin, let the peptides absorb, then layer retinol, vitamin C, or hyaluronic acid on top. Many users alternate retinol nights with peptide nights to minimize irritation.

Clinical research on GHK-Cu, Palmitoyl Tripeptide-1, and Palmitoyl Tetrapeptide-7 examined these peptides as focused formulations, not diluted with other active ingredients in the same product. Adding hyaluronic acid or vitamin C reduces the peptide concentrations studied in literature. Layer them separately if desired.

Yes. Both products use the same copper peptide (Copper Tripeptide-1, also written GHK-Cu). There is no washout period required. Substitute PLU into the same slot in your routine. See our side-by-side at asterwood alternatives.

Generally well tolerated. Research has examined copper peptides across a range of concentrations. If you are stepping up from a very low concentration, start with once-daily use on clean skin, apply before heavier moisturizers, and build up as your skin adjusts.

Water, Glycerin, 1% GHK-Cu (Copper Tripeptide-1), 1% Acetyl Tetrapeptide-3, and Phenoxyethanol. A dual-peptide system: copper peptides supporting scalp health plus biomimetic peptides studied for hair follicle support.

The copper peptide variant. GHK-Cu (Copper Tripeptide-1) is naturally occurring and has decades of skin and hair research behind it. AHK-Cu (Copper Tripeptide-3) is a synthetic variant with research focused specifically on hair follicle applications. Both formulas are 1% copper peptide plus 1% Acetyl Tetrapeptide-3 in the same clean 5-ingredient base, ingredient preference is the differentiator.

Apply 2-3 drops directly to a clean, towel-dried scalp in areas of concern once daily. Massage gently. No rinsing required. Takes about 20-30 seconds.

Clinical research on Acetyl Tetrapeptide-3 and GHK-Cu typically notes appearance changes within 3-6 months of consistent daily use. Some users notice scalp comfort and hair feel within 2-4 weeks. Hair density appearance develops gradually; consistency matters more than starting intensity.

Research suggests GHK-Cu may support hair density appearance through scalp health and follicle biology. Our Hair Tonic pairs it with Acetyl Tetrapeptide-3 (biomimetic peptide targeting the dermal papilla) for a dual-peptide approach studied in clinical literature. Individual results vary.

Anyone. Research on GHK-Cu and Acetyl Tetrapeptide-3 applies equally across genders. We position for men in some marketing for efficiency-focused messaging, but the formulation supports scalp and hair appearance regardless of gender.

GHK-Cu is a naturally occurring copper peptide made of three amino acids (glycine, histidine, lysine) bound to copper. NIH research describes GHK-Cu as both a signal peptide (communicating with skin cells) and a carrier peptide (delivering copper ions studied for tissue processes and collagen production pathways).

A dual-peptide complex working together as matrikine signaling peptides studied for fine lines appearance and skin texture. Many peptide serums contain only one of these or substitute with unrelated peptides; the complete complex requires both.

A biomimetic peptide extensively studied for supporting hair follicle structure. Research suggests it targets the dermal papilla (the foundation of hair follicles) through cellular signaling mechanisms, distinct from hormonal DHT-blocker pathways.

Each peptide works through different mechanisms studied in clinical research. Combining GHK-Cu (signal and carrier peptides) with Palmitoyl Peptides (matrikine signaling) or Acetyl Tetrapeptide-3 (biomimetic follicle support) creates a comprehensive approach through complementary pathways rather than relying on a single peptide.

Clinical research examines these ranges: GHK-Cu 0.5-2%, Acetyl Tetrapeptide-3 0.5-2%. Our formulas use 1% GHK-Cu, Palmitoyl Peptides, and 1% Acetyl Tetrapeptide-3, balanced between efficacy studied in literature and tolerance across skin and scalp types.

Store at room temperature (60-75 degrees F) in a cool, dry place away from direct sunlight and heat. Avoid bathrooms where temperature and humidity fluctuate. Keep bottles tightly closed. Peptides are sensitive to temperature extremes and light.

We accept returns of unopened, unused products within 30 days of delivery. Original packaging must be intact and proof of purchase required. See our full returns and refund policy for complete terms. Contact productteam@plulaboratories.com to start a return.

Refunds are processed within 5-7 business days of receiving your returned item. Once processed, it appears in your original payment method within 3-5 business days depending on your bank. You will get an email confirmation.

Yes, for unopened, unused products within 30 days of delivery. Contact productteam@plulaboratories.com with your order number and the product you would like to exchange to. We will arrange the exchange and provide instructions.

Orders process within 1-2 business days. Domestic shipping takes 3-5 business days after processing. Tracking is emailed automatically once your order ships. Weekend and holiday orders are processed the next business day.

We ship within the United States only through our website. Some international customers can order our products through our Amazon.com listings. We are working on direct international shipping options. Email productteam@plulaboratories.com with your location if you are interested in future direct availability.

Tracking info is emailed automatically once your order ships. If you have not received it within 2 business days of ordering, contact productteam@plulaboratories.com.