GHK-Cu: Dosage & Administration

GHK-Cu is studied across multiple routes, and each route targets a different application. The dose range you use depends entirely on what you are trying to accomplish — there is no single "correct" GHK-Cu dose.

Route	Dose	Frequency	Primary Application	Cycle
Topical (cream / serum)	1–3% concentration	1–2× daily	Skin anti-aging, fine line reduction, post-procedure recovery	Indefinite / no cycling
Topical (high-concentration spot treatment)	5–10% concentration	Once daily	Scarring, deep wrinkles, post-surgical scar fading	8–12 weeks
Subcutaneous	200–500 mcg daily	Once daily	Systemic anti-inflammatory, hair / skin support, general repair	4–8 week cycles
Intradermal (scalp)	50–200 mcg per session	1–2× weekly	Androgenetic alopecia, follicle stimulation	3–6 months
Microneedling adjunct	Applied to skin during / post needling	Per session, 2–4 weeks apart	Scarring, photoaging, hair (scalp microneedling)	4–6 sessions

Body weight is generally not a primary dosing variable for GHK-Cu — unlike most peptides, the published protocols use fixed-dose ranges. The published clinical literature uses topical concentrations (Pickart and colleagues primarily); systemic subcutaneous protocols come from the research peptide community. For systemic dosing, use the peptide calculator to convert vial sizes to volumes.

Topical GHK-Cu has the largest evidence base. Published trials in skin used the following parameters:^[1]

• Concentration: 1–3% is the typical cosmetic range; clinical studies have used up to 5%.
• Vehicle: a stable emulsion or serum. Avoid low-pH vehicles (below pH 5) because they destabilize the copper complex.
• Application: apply to clean, dry skin. Layer under heavier creams. Most users tolerate twice-daily use.
• Sun protection: use SPF 30+ during the day during the first 4–8 weeks; some users notice mild photosensitivity during initial cellular remodeling.
• Time to effect: visible improvements in skin texture and tone typically appear at 4–8 weeks of consistent use; collagen and elasticity changes accumulate over 12+ weeks.

For a layered skincare routine, see the GLOW peptide blend which combines GHK-Cu with other regenerative peptides.

Subcutaneous GHK-Cu is used for systemic effects — hair growth, broader skin remodeling, anti-inflammatory effects, and tissue repair support. Published protocols are smaller-scale than topical research.

Reconstitution math

GHK-Cu typically comes as a lyophilized powder in vials of 50 mg or 100 mg. The molecule's blue-green color is normal and indicates the intact copper complex.

• 50 mg vial + 2 mL BAC water = 25 mg/mL (25,000 mcg/mL) — 0.01 mL (1 unit on an insulin syringe) = 250 mcg. Very small volumes; pull the dose into the syringe carefully.
• 50 mg vial + 5 mL BAC water = 10 mg/mL (10,000 mcg/mL) — 0.025 mL (2.5 units) = 250 mcg. Larger volume per dose, easier to measure.
• 100 mg vial + 5 mL BAC water = 20 mg/mL (20,000 mcg/mL) — 0.025 mL (2.5 units) = 500 mcg.

Use the peptide calculator for exact volumes based on your vial size. For step-by-step reconstitution, see the reconstitution guide.

Injection

Subcutaneous injection in the abdomen, thigh, or upper arm. Rotate sites. See the injection technique guide. The blue-green color stays visible after injection for a few minutes — that's normal.

For androgenetic alopecia (male and female pattern hair loss), some clinics combine intradermal GHK-Cu with microneedling.

• Dose: 50–200 mcg per scalp session, divided across the affected area in small intradermal injections (papules) or applied during/after microneedling.
• Frequency: weekly to bi-weekly during the active phase (first 8–12 weeks); monthly maintenance thereafter.
• Combination: often stacked with topical minoxidil; some clinics also combine with topical finasteride or other hair-growth actives. Discuss with your dermatologist before combining.
• Time to effect: hair cycles run 3–6 months — visible change requires at least 3 months of consistent treatment.

For the broader peptide-and-hair picture, see peptides for hair growth.

• pH range: stable at pH 6.5–7.5. Avoid layering immediately with low-pH actives (vitamin C ascorbic acid below pH 4, AHAs); the copper complex destabilizes.
• Oxidizers: do not combine with benzoyl peroxide — it oxidizes and destroys the peptide.
• Light: protect from prolonged direct sunlight (UV degrades the peptide); use opaque or amber packaging.
• Temperature: lyophilized vials store long-term at -20°C or 2–8°C (refrigerator). Reconstituted: refrigerate at 2–8°C and use within 28–30 days.
• Reconstituted color: deep blue or blue-green is normal; loss of color indicates degradation.

For complete storage guidelines, see the peptide storage guide.

Topical GHK-Cu has been used continuously for years in commercial cosmetics with no documented tolerance or cumulative safety concern. No cycling is required for topical use.

Systemic (subcutaneous, intradermal) protocols typically run 4–8 weeks on, with optional breaks. The research community has not established a definitive cycling pattern, but most users prefer cycles rather than continuous indefinite systemic dosing — both to track effect and to avoid the unknown long-term implications of sustained supraphysiological serum GHK-Cu.