GHK-Cu
GHK-Cu (copper tripeptide-1) is a naturally occurring tripeptide-copper complex studied in tissue-repair and skin research.
You have probably already touched this one without knowing. It is the peptide that actually crossed over onto real shelves.
How it is thought to work
Copper-binding peptide with repair signaling.
GHK-Cu is a naturally occurring copper-carrying peptide that declines with age; it works by delivering copper to cells and signaling genes in skin fibroblasts to boost collagen, elastin, and tissue-repair activity. Most of the solid human evidence is for topical use on skin.
Reported side effects
Topical GHK-Cu most commonly causes mild local redness, tingling, dryness, or irritation (especially at concentrations above 4%), while injectable use may cause local redness, swelling, warmth, or a slight blue-tinted bruise, with systemic effects being rare and not well characterized in published trials.
Who should avoid it
People who are pregnant or breastfeeding, have active cancer, have a copper metabolism disorder like Wilson's disease, are allergic to copper, or have an active skin infection at the application site should avoid GHK-Cu or consult a clinician first.
What gets monitored
No specific bloodwork or monitoring schedule is stated. [Source: Peptide Dosing Protocols]
What sources report
These are figures published elsewhere, reproduced with their source. Peppersite does not recommend an amount for GHK-Cu or for anything else, and nothing below has been checked against the study it came from.
| Amount | Frequency | Route | Reported by |
|---|---|---|---|
| 1-2 mg SC daily, or topical application | once daily30-day cycles · 30-day cycles | subcutaneous or topical | Commonly published practitioner dosing range - provider confirmation required. |
| Topical: 0.01-1% in cream/serum; SC injection: 1-2 mg daily | Topical: once or twice daily; SC: once dailyRepeatable | subcutaneous or oral or topical | Peptide Protocol WikiWhat it saysHide(secondary reference; provider confirmation required). |
| Standard: 1.0-1.5 mg · Low: 1.0 mg · High: 2.0 mg | Daily4-6 weeks · 4-8 weeks | Subcutaneous injection | Peptide Dosing ProtocolsWhat it saysHide(secondary reference; provider confirmation required). The standard dosing for GHK-Cu is 1.0-1.5 mg daily for 4-6 weeks. |
| Topical: serum to face and neck twice daily (AM and PM) after cleansing, before moisturizer. Injectable referenced at 200-300 mcg (0.2-0.3 mg) before bedtime in recovery contexts; sterile technique and supervision stressed. Microneedling before topical cited to enhance absorption. | Topical 2x daily; injectable nightly in recovery contexts · Topical AM/PM; injectable before bed | topical or subcutaneous | Peptide Therapy Reference Text, internal KB v4What it saysHide(Aug 2026), secondary reference; provider confirmation required. |
- once daily30-day cycles · 30-day cycles
- subcutaneous or topical
- Commonly published practitioner dosing range - provider confirmation required.
- Topical: once or twice daily; SC: once dailyRepeatable
- subcutaneous or oral or topical
- Peptide Protocol Wiki
What it saysHide
(secondary reference; provider confirmation required).
- Daily4-6 weeks · 4-8 weeks
- Subcutaneous injection
- Peptide Dosing Protocols
What it saysHide
(secondary reference; provider confirmation required). The standard dosing for GHK-Cu is 1.0-1.5 mg daily for 4-6 weeks.
- Topical 2x daily; injectable nightly in recovery contexts · Topical AM/PM; injectable before bed
- topical or subcutaneous
- Peptide Therapy Reference Text, internal KB v4
What it saysHide
(Aug 2026), secondary reference; provider confirmation required.
- Commonly 50 mg vials (injectable) or topical formulations · Reconstitute with bacteriostatic water (injectable)
- Bacteriostatic water
- 50 mg vial reconstituted with 2.0 mL bacteriostatic water
Common questions
What is GHK-Cu?
GHK-Cu is a small peptide made of three amino acids (glycine, histidine, lysine) bound to a copper ion.
Is GHK-Cu FDA-approved?
No. GHK-Cu is not an FDA-approved drug.
What is the typical GHK-Cu dosage?
Community-derived research planning typically uses 1-2 mg per day subcutaneous for injectable workflows and 1-3% topical formulations.
Is GHK-Cu better topical or injectable?
Topical is the more evidence-supported route, especially for skin endpoints.
How is GHK-Cu reconstituted?
A common pattern is a 50 mg vial reconstituted with 2.0 mL bacteriostatic water.
Check 50 mg in 2 mL in the calculator →What are the main side effects of GHK-Cu?
Topical effects are usually mild and local: redness, tingling, dryness, or transient irritation.
How long does it take to see results from GHK-Cu?
Topical trials measured skin endpoints at 8-12 weeks.
Can GHK-Cu be combined with BPC-157 and TB-500?
GHK-Cu, BPC-157, and TB-500 are commonly combined in the GLOW stack.
Sources
The reference sections above are imported from our compound knowledge base, which classes the evidence for GHK-Cu as emerging. That classification is the knowledge base’s, not ours, our own grade appears only where an audit is linked above. Research use only; nothing here is medical advice or a protocol.
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