How many units of GHK-Cu should I draw?

It depends on your vial size, BAC water, and dose. For a 5mg vial with 2mL BAC water, a beginner dose of 1000mcg is typically 40 units on a U-100 syringe. Use the calculator above for your exact numbers.

How much BAC water should I add to GHK-Cu?

The standard amount is 2mL of bacteriostatic water for a 5mg vial. More water gives a more dilute solution — easier to measure small doses. Less water means fewer injections per vial. Adjust the BAC water slider in the calculator to see how it changes your syringe units.

How long does a GHK-Cu vial last?

At a beginner dose of 1000mcg daily, a 5mg vial lasts about 5 doses. The calculator shows exact doses per vial for your selected tier.

What syringe should I use for GHK-Cu?

Most people use a U-100 insulin syringe (1mL / 100 units). For very small doses, a U-50 or U-30 syringe gives better precision. The calculator adjusts units automatically for whichever syringe you pick.

How should I store GHK-Cu after reconstitution?

Store reconstituted GHK-Cu at 2-8°C (36-46°F). Refrigerate, use within 3-4 weeks. Before reconstitution: refrigerate at 2-8°c.

How does GHK-Cu compare to similar peptides?

GHK-Cu has 2 head-to-head comparisons available: Epithalon, BPC-157. See the full comparison pages for dosing differences, mechanisms, and which one fits your goals.

My reconstituted GHK-Cu is blue-green: is it still good?

Yes, that blue-green color is actually a good sign. It means the copper-peptide complex is intact. A colorless solution could actually indicate copper dissociation, which would mean reduced potency. The color comes from the copper(II) ion coordinated to the peptide.

Can I inject GHK-Cu directly into my face or scalp?

Perilesional injections near the target area are used clinically for wound healing and sometimes near the scalp for hair regrowth. But copper irritation is more pronounced at highly vascularized or thin-skinned sites. Most protocols use abdominal SC for systemic effects. Peri-target injection adds localized benefit but expect more site reactions.

How long does reconstituted GHK-Cu last?

Community consensus is 2-3 weeks refrigerated if you used sterile reconstitution technique. Some users report 15-30% potency loss by week 4. Keep it protected from light and don't freeze it.

Not medical advice. Talk to your provider before using any peptide.

Full disclaimer

Peptide Schedule Research TeamReviewed Apr 202614 Citations

Anti-AgingResearchGrade A

Copper PeptideAnti-AgingWound HealingCollagen Production

GHK-Cu Dosage Calculator

1 h half-life·Injection/Topical·8w on / 4w off

GHK-Cu modulates over 4,000 genes tied to collagen, wound repair, and aging. Community reports consistently describe firmer skin by week four and faster healing. No human injectable RCTs exist yet, but topical trials and decades of in vitro data back its core mechanisms. Available as subcutaneous injection or topical serum.

Used by Amy, Brecka

Popular100–200+162Moderate

20 referencesVerified 2026-04-07

Vial Size

BAC Water (mL)

Dosing Level

1mg · Daily

Custom Dose (mcg) — optional

Syringe Type

40.0 units

100 units (1mL)

Concentration

2,500

mcg/mL

Draw Volume

0.400

Syringe Units

40.0

units

Doses / Vial

doses

Summary: Add 2mL BAC water to your 5mg vial. Draw to 40.0 units on a U-100 syringe for a 1mg dose. This vial will last 5 doses.

Schedule This Protocol

1mg daily — draw 40.0 units on U-100 syringe

Subcutaneous or Topical. Typical beginner frequency: daily.At beginner dose (1000mcg) with a 5mg/2mL vial: draw to the 40-unit mark on a U-100 syringe.

After reconstituting, store at 2-8°C (36-46°F) (refrigerate, use within 3-4 weeks).

View side effects and safety warnings →

Quick-Start: Reconstitution

1Gather supplies: GHK-Cu lyophilized vial, bacteriostatic water, alcohol swabs, U-100 insulin syringe (29 to 31 gauge, 0.5 inch needle).
2Clean both vial stoppers with alcohol swabs and let dry.
3Draw your bacteriostatic water volume. For a 5 mg vial, use 2 mL. For a 50 mg vial, use 5 mL.

Full injection guide →

GHK-Cu Dosing Protocol

CommunityCommunity dosing consensus from peptide research communities

Level	Dose / Injection	Frequency
Beginner	1mg	Daily
Moderate	2,500mcg	Daily
Aggressive	3mg	Daily

Note:

The blue-green color when you reconstitute is not contamination. It's the copper(II) ion doing exactly what it should. If your solution is colorless after proper reconstitution, that's actually the problem: copper may have dissociated, and potency drops with it. Reconstitution math for common vial sizes: a 5 mg vial plus 2 mL bacteriostatic water gives you 2,500 mcg/mL. A 1 mg dose (1,000 mcg) equals 0.4 mL, which is 40 units on a U-100 insulin syringe. For the 50 mg vial plus 5 mL bacteriostatic water, you get 10,000 mcg/mL; a 1 mg dose is just 0.1 mL or 10 units. Store reconstituted vials in a dark refrigerator. Copper ions are photosensitive. Expect two to three weeks of usable shelf life. Start at 500 mcg/day for injectable and titrate up over two weeks. Evening injection is the community standard. Rotate abdominal sites and don't hit the same spot more than once per week; lipodystrophy from poor rotation is a real and visible consequence.

Dosing based on Community dosing consensus from peptide research communities — 20 published references.View all sources →

Verify your calculation

Cross-check your GHK-Cu reconstitution math with AI

GHK-Cu Cost

Generic / Research

Research vendor (lyophilized, not sterile): 5mg ~$20–$25 (~$4–5/mg); 50mg ~$30–$55 (~$0.60–$1.10/mg); 100mg ~$55–$90 (~$0.55–$0.90/mg). Typical monthly cost at 1 mg/day from 50mg vial: ~$18–$33. Quality benchmark: under $0.30/mg is a red flag.

Compounded

Compounding pharmacy (sterile, USP 797, Rx required): injectable ~$100–$250/month self-administered; clinic-dispensed ~$150–$350/session. Topical clinical-grade cream ~$80–$150/bottle. Note: injectable GHK-Cu was removed from FDA Category 2 on April 15, 2026. PCAC review begins July 2026. Compounding pharmacy access not yet available.

Pricing updated 2026-04-09

Prices are estimates and vary by source, location, and prescription status.Full pricing breakdown →

GHK-Cu Pharmacokinetics

Pharmacokinetics — Active Dose Over Time

t½ = ~1 hour

After 1 half-life (60m): 50% remainsAfter 2 half-lives (2h): 25% remainsAfter 3 half-lives (3h): 12.5% remains

At a 2.5mg dose: 50% = 1.3mg remaining after 60m. Recommended frequency: Daily.

Disclaimer: This curve is a simplified first-order exponential decay model. Actual pharmacokinetics vary based on injection site, individual metabolism, body composition, and other factors. Half-life values are approximate and based on available preclinical and clinical literature. Many research peptides lack formal human pharmacokinetic studies. This is for educational purposes only — not medical advice.