How many units is 2 mg of GHK-Cu?

It depends entirely on how much water you added. In a 50 mg vial reconstituted with 5 mL, the concentration is 10 mg/mL, so 2 mg is 0.2 mL, which is 20 units on a U-100 insulin syringe. In the same vial with 2.5 mL of water it is 10 units, and with 7.5 mL it is 30 units.

How much bacteriostatic water for a 50 mg GHK-Cu vial?

5 mL is the usual choice. It gives 10 mg/mL, which puts the commonly reported range of 1 mg to 5 mg between roughly 10 and 50 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.

How many doses are in a 50 mg vial?

Divide 50 by your dose. At 2 mg that is 25 doses, which at once daily is 25 days.

How many units is 2 mg of GHK-Cu?

In a 50 mg vial with 5 mL of water, 20 units on a U-100 syringe. In the same vial with 2 mL of water, 8 units.

Why is my GHK-Cu blue?

The copper ion. A clear blue solution is expected. Cloudiness or particles are not.

GHK-Cu dosage calculator

GHK-Cu comes in unusually large vials, 50 to 200 mg, and is dosed in whole milligrams. Enter your vial, water and dose to get the syringe mark.

IndependentThis site does not sell peptides and is not owned by a vendor. Every other calculator on page one of Google belongs to a shop.

The maths is openThe formula is written out on this page and the code behind it is a single file with an automated test suite.

How it earnsAffiliate links on one clearly marked page, and nowhere else. Never inside the calculator.

ReviewedDose ranges and half-life figures last checked 3 September 2026.

Dose to units, at the standard setup

Dose	Draw	U-100 units	Doses per vial	Vial lasts
1 mg	0.1 mL	10 units	50	50 days
1.5 mg	0.15 mL	15 units	33	33 days
2 mg	0.2 mL	20 units	25	25 days
3 mg	0.3 mL	30 units	16	16 days
4 mg	0.4 mL	40 units	12	12 days
5 mg	0.5 mL	50 units	10	10 days

Based on a 50 mg vial reconstituted with 5 mL of bacteriostatic water, which is 10 mg/mL, drawn on a standard U-100 insulin syringe, once daily.

About the numbers above

GHK-Cu is a naturally occurring copper-binding tripeptide, best known from skincare, and also sold as a lyophilised powder for subcutaneous injection. It is not an approved injectable medicine and is sold for research. The solution is blue; that is the copper, not a problem.

The vials are large, so the arithmetic is different from most peptides. A 50 mg vial with 5 mL of water is 10 mg/mL, so 2 mg is 0.2 mL, or 20 units. Injection-site stinging is widely reported, and a lower concentration (more water) is the usual response to that. Commonly reported doses are 1 to 2 mg daily, sometimes higher.

A 50 mg vial at different water volumes

If the draw feels awkward to read, change the water rather than the dose. The dose stays the same; only the mark moves.

Vial	BAC water	Concentration	Draw	U-100 units	Doses/vial
50 mg	2 mL	25 mg/mL	0.08 mL	8 units	25
50 mg	3 mL	16.67 mg/mL	0.12 mL	12 units	25
50 mg	5 mL	10 mg/mL	0.2 mL	20 units	25
100 mg	2 mL	50 mg/mL	0.04 mL	4 units	50
100 mg	3 mL	33.33 mg/mL	0.06 mL	6 units	50
100 mg	5 mL	20 mg/mL	0.1 mL	10 units	50

All rows above assume a 2 mg dose and a standard U-100 insulin syringe, where 100 units = 1 mL.

How long it stays in you

Not well characterised in humans. This site only draws a decay curve where a half-life is actually documented in humans, so there is none here. Treat any precise figure you see elsewhere for GHK-Cu with suspicion.

Common questions

How many units is 2 mg of GHK-Cu?: It depends entirely on how much water you added. In a 50 mg vial reconstituted with 5 mL, the concentration is 10 mg/mL, so 2 mg is 0.2 mL, which is 20 units on a U-100 insulin syringe. In the same vial with 2.5 mL of water it is 10 units, and with 7.5 mL it is 30 units.
How much bacteriostatic water for a 50 mg GHK-Cu vial?: 5 mL is the usual choice. It gives 10 mg/mL, which puts the commonly reported range of 1 mg to 5 mg between roughly 10 and 50 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.
How many doses are in a 50 mg vial?: Divide 50 by your dose. At 2 mg that is 25 doses, which at once daily is 25 days.
How many units is 2 mg of GHK-Cu?: In a 50 mg vial with 5 mL of water, 20 units on a U-100 syringe. In the same vial with 2 mL of water, 8 units.
Why is my GHK-Cu blue?: The copper ion. A clear blue solution is expected. Cloudiness or particles are not.

Buying GHK-Cu? The where to buy page lists the vendors this site uses and what to check before ordering, and Peptide Bureau keeps the ranked vendor scorecard.

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Read this before you use the numbers. This is a unit-conversion tool. It converts a vial strength and a volume of bacteriostatic water into a concentration, a draw volume and a mark on an insulin syringe. It does not tell you what to take, whether to take it, or whether a compound is safe for you. Most of the compounds listed here are sold for laboratory research use and are not approved for human use. Nothing on this site is medical advice. Dosing decisions belong with a licensed clinician who knows your history. Always confirm the strength printed on your own vial rather than trusting a preset.