How to Reconstitute GHK-Cu: 50mg & 100mg Guide

Gather these supplies before you start:

• GHK-Cu lyophilized vial (50mg or 100mg)
• Bacteriostatic water (0.9% benzyl alcohol)
• 3mL or 5mL syringe with needle for drawing BAC water
• Insulin syringes (29 to 31 gauge) for dosing
• Alcohol swabs

Follow these six steps. The entire process takes two to five minutes.

1. 1.Wipe both vial stoppers with alcohol swabs. Let them air dry for 10 seconds.

1. 1.Draw bacteriostatic water into a syringe. See the concentration table below to choose your volume.

1. 1.Insert the needle at an angle into the GHK-Cu vial. Aim the stream at the glass wall, not directly onto the powder.

1. 1.Release the water slowly over 30 to 60 seconds. Let it trickle down the inside wall and pool at the bottom.

1. 1.Remove the syringe. Gently swirl the vial in a circular motion until the powder dissolves completely. Never shake. Mechanical shearing denatures the peptide. Dissolution takes 1 to 3 minutes.

1. 1.Verify and store. The solution should be clear with a faint blue-green tint. This color comes from the copper(II) ion and confirms the copper remains bound to the peptide. Refrigerate immediately at 2 to 8°C.

Discard the solution if it is cloudy, contains particles, or turns brown or dark green. These signs indicate degradation or contamination. Loss of the blue-green tint means copper has dissociated from the peptide, reducing potency.

For a general guide covering all peptides, see How to Reconstitute Peptides. For injection technique after reconstitution, see the Peptide Injection Guide for Beginners.

The formula is straightforward: Concentration (mg/mL) = Vial size (mg) / Water added (mL). This table covers both vial sizes at three common water volumes.

Recommended: For most users, 50mg + 5mL (10 mg/mL) offers the best balance of accuracy and convenience. Larger draw volumes leave more room for syringe reading error, which means smaller dosing mistakes.

For any vial size and water volume, use the Peptide Reconstitution Calculator.

This table shows total doses per vial at common daily dosages, along with practical cycle coverage using a 5-on, 2-off injection schedule.

Reconstituted GHK-Cu stays stable for 28 to 30 days when refrigerated with bacteriostatic water. A 100mg vial at 1mg per day contains more doses than the solution's shelf life allows. Three options: increase the daily dose, use a 50mg vial that matches your cycle length, or split the reconstituted solution into sterile sub-vials if your supplier provides them.

For complete protocols by goal (skin rejuvenation, hair growth, wound healing), see the GHK-Cu Dosage Guide. For injection scheduling, see the GHK-Cu injection frequency guide.

Reconstituted solution: Refrigerate at 2 to 8°C (36 to 46°F), protected from light. Stable up to 28 to 30 days with bacteriostatic water. Do not freeze the reconstituted solution. Ice crystal formation denatures the peptide.

Unreconstituted powder: Store in the freezer at -20°C for months to years. Unopened vials tolerate room temperature for several weeks. Keep the desiccant packet in the storage container.

pH stability: GHK-Cu is stable at pH 5.0 to 6.5. Bacteriostatic water (pH ~5.7) falls within this range. Avoid mixing GHK-Cu with acidic solutions such as vitamin C or AHA/BHA serums for topical use. A pH below 4.0 causes copper dissociation and renders the peptide inactive.

For storage guidance across all peptides, see How to Store Peptides. For information on how long does bacteriostatic water last and does bacteriostatic water need to be refrigerated, see our dedicated guides.

Most people reconstitute correctly but then draw the wrong amount. The syringe is where dosing errors happen. Understanding the markings prevents every downstream mistake.

An insulin syringe is calibrated in "units," not milligrams. A U-100 syringe has 100 units per 1 mL. Each unit equals 0.01 mL. When you see "draw to 20 units," that means draw to the 0.20 mL line.

Three common insulin syringe sizes:

For GHK-Cu at 10 mg/mL (50mg vial + 5mL water), a 2mg dose requires 20 units. A 0.5 mL syringe handles this easily with clear markings at every unit. A 1.0 mL syringe works too but the markings are closer together and harder to read precisely.

For GHK-Cu at 25 mg/mL (50mg vial + 2mL water), a 2mg dose requires only 8 units. A 0.3 mL syringe with half-unit markings gives the best precision at this small volume. On a 1.0 mL syringe, the difference between 8 and 10 units is barely visible, and that 2-unit error means 0.5 mg of extra peptide per injection.

The principle: match the syringe to the draw volume. Smaller draw volumes need smaller syringes. If your dose falls below 10 units, switch to a 0.3 mL syringe. If it is above 30 units, use a 1.0 mL syringe. The Peptide Unit Converter shows exact unit counts for any concentration.

Reconstitution errors produce silent dosing errors. You inject what you think is the right amount, but the concentration is off and the actual dose is wrong. Two scenarios illustrate the danger.

Scenario 1: Half the water, double the dose. You have a 50mg vial. You intend to add 5 mL of bacteriostatic water for a 10 mg/mL solution. But you accidentally add only 2.5 mL. The actual concentration is now 20 mg/mL. When you draw 20 units for your 2mg dose, you are actually injecting 4 mg. That is double the intended dose, every single injection, for the entire vial. At standard doses, GHK-Cu sits roughly 300-fold below the toxic threshold. Doubling the dose is not dangerous in the acute sense, but it wastes peptide, shortens your vial life by half, and increases cumulative copper exposure unnecessarily.

Scenario 2: Wrong vial size assumption. You have a 100mg vial but follow a reconstitution guide written for 50mg vials. You add 5 mL of water expecting 10 mg/mL. The actual concentration is 20 mg/mL. Every injection delivers twice what you planned. Over a 30-day cycle at 2mg per day, you would inject 120 mg instead of 60 mg. The vial runs out in 15 days instead of 25.

The fix for both: Always check the vial label before adding water. Confirm the peptide mass (printed on the vial and the box), then calculate or verify with the Peptide Reconstitution Calculator. Write the concentration and reconstitution date on the vial with a marker. This 10-second habit prevents every concentration error.

How to verify after reconstitution. If you suspect the concentration is wrong, the math works backwards too. Divide the total peptide content by the concentration you measured. If you added 5 mL to a 50mg vial and the calculator says 10 mg/mL, that confirms the math. If the numbers do not match, you added the wrong volume. Unfortunately, once reconstituted, you cannot undo the dilution. You can only adjust your draw volume going forward using the corrected concentration.

GHK-Cu reconstitution follows the same basic process as any lyophilized peptide, but three details are unique to copper-bound peptides. This table compares GHK-Cu to the most common peptides you might reconstitute alongside it.

The saline restriction is the critical difference. If you reconstitute multiple peptides in the same session, keep the saline away from GHK-Cu vials entirely. Label your solvents clearly. A single accidental saline reconstitution renders the entire vial of GHK-Cu less effective.

The blue-green color is unique to GHK-Cu and acts as a built-in quality indicator. No other common peptide provides this visual confirmation that the active compound is intact. Use it. Check the color every time you draw a dose.

For users running a GHK-Cu + BPC-157 + TB-500 blend, the blend vial is pre-mixed and the solvent choice is already accounted for. Reconstitute the blend with bacteriostatic water per the blend dosage guide.

The powder will not dissolve. GHK-Cu typically dissolves within 1 to 3 minutes of gentle swirling. If clumps persist after 5 minutes, the water likely hit the powder cake directly during injection. Set the vial upright and let it sit for 10 minutes. Then swirl again. Do not shake. If it still will not dissolve after 15 minutes, the peptide may have degraded during shipping or storage. Check the expiration date and storage conditions.

Foam on top of the solution. Small bubbles are normal and dissipate within a few minutes. A thick layer of foam indicates you either shook the vial or injected the water too forcefully. Let the vial sit undisturbed for 10 to 15 minutes. The foam will settle. Draw from beneath the foam layer when dosing.

No blue-green tint. A completely clear, colorless solution after dissolving GHK-Cu suggests the copper ion has dissociated from the tripeptide. Possible causes: contamination with saline, exposure to acidic solutions (pH below 4.0), or degraded peptide that lost its copper during storage. Potency is likely reduced. If you are certain you used bacteriostatic water and the vial was stored correctly, the peptide may have been compromised before purchase. Contact the supplier.

Solution turns brown or dark green over time. This indicates oxidative degradation of the copper complex. Causes include light exposure, temperature above 8°C for extended periods, or contamination. Discard the vial. This is not a potency reduction; it is a chemical change that produces breakdown products you should not inject.

Rubber stopper fragments in the solution. Coring occurs when the needle punches a small piece of rubber into the vial. Prevention: insert the needle at a 45-degree angle with the bevel facing up, then straighten to 90 degrees once through. If you see fragments, draw the solution through a 0.22 micron syringe filter before injecting. Better yet, discard and reconstitute a new vial if you have one available.

1. 1.Shaking the vial. Mechanical shearing denatures the peptide. Always swirl gently in a circular motion.

1. 1.Using normal saline. Sodium chloride interferes with copper chelation, stripping the copper(II) ion from the GHK tripeptide. Use only bacteriostatic water.

1. 1.Spraying water directly onto the powder. Direct impact causes clumping and foaming. Aim the stream at the glass wall and let it trickle down.

1. 1.Storing at room temperature. Reconstituted GHK-Cu degrades rapidly above 8°C. Refrigerate immediately after mixing and between every use.

1. 1.Ignoring color changes. Fresh GHK-Cu solution has a faint blue-green tint from the copper(II) ion. Loss of color, cloudiness, or a brown shift means degradation. Discard the vial.