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, so the same dose fills more of the syringe and is easier to measure. Less water makes the draw smaller and harder to read. The number of doses per vial does not change either way, since that depends only on vial size and dose. 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 1mL U-100 insulin syringe (100 units). For very small doses, a 0.5mL or 0.3mL barrel is easier to read. All three are U-100 graduated, so the number of units to draw is the same on each. Veterinary U-40 syringes are a different scale and the calculator adjusts for that separately.

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 Aug 202615 Citations

GHK-Cu Dosage Calculator

Turns your vial size, BAC water, and dose into exact syringe units. Free, no signup.

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

21 refsVerified 2026-08-07

Calculate your dose

Adjust vial, water, and dose — answer updates live

Live

Vial Size

BAC Water (mL)

Dose Tier

1mg · Daily

Custom Dose (mcg) optional

Syringe

All three take the same units for the same dose. A smaller barrel just spreads it over more space.

Draw to 40.0 units= 0.400 mL

on a U-100 syringe for a 1mg dose

Concentration

2,500

mcg/mL

Doses / vial

Cost / dose

$0.50

Market est. ·

Your mixing recipe

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

Double-check with AI GHK-Cu profile

Copy link saves these numbers in the address. Anyone who opens it sees the same draw.

Save this as a tracked protocol

Never miss a dose — 1mg daily, draw 40.0 units on U-100 syringe.

Calendar sync

Apple · Google · Outlook

Daily reminders

Never miss a dose

Dose tracking

See adherence streaks

Cycle planning

Auto on/off weeks

Tracking needs a free account, about 20 seconds
The calculator stays free without one

Save this as a tracked protocol

Never miss a dose — 1mg daily, draw 40.0 units on U-100 syringe.

Calendar sync

Apple · Google · Outlook

Daily reminders

Never miss a dose

Dose tracking

See adherence streaks

Cycle planning

Auto on/off weeks

Tracking needs a free account, about 20 seconds
The calculator stays free without one

Cycle Length (weeks)

Price Per Vial ($) — optional

Open GHK-Cu details

Side effects, protocols by goal, storage, and the sources behind these dosing numbers.

About GHK-Cu

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.

Copper PeptideAnti-AgingWound HealingCollagen ProductionSkin Rejuvenation

Popular100–200+162Moderate

Used by Amy, Brecka

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→

Need a different vial size? Open the universal GHK-Cu reconstitution calculator to enter any vial mg + BAC water mL.

GHK-Cu Dosing Protocol

CommunityCommunity dosing consensus from peptide research communities

Level	Dose / Injection	Frequency
Beginner	1mg	Daily
Moderate	2.5mg	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 — 21 published references.View all sources →

How the GHK-Cu Math Works

5mg in 2mL: =2.5mg/mL
2.5mg/mL: =25mcg per unit
1,000mcg / 25: =40 units
5mg / 1,000mcg: =5 doses

Based on a 5mg vial, 2mL of bacteriostatic water, the beginner dose (1,000mcg), and a U-100 syringe. Change any input in the calculator and every line moves with it.

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% = 1.25mg 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.

Read the full GHK-Cu guide →Best Peptides for Healing →