GHK-Cu 50mg vs 100mg: what's the difference?

The only difference between the GHK-Cu 50 mg and 100 mg vials is how much lyophilized powder is in the vial. The molecule is identical at 403.91 g/mol either way, and both are tested the same way. The 100 mg vial holds twice the material for $34.99 against $24.99, which moves the price per milligram from about $0.50 to about $0.35.

What changes between the 50 mg and 100 mg vials

The peptide, its formula and its mass do not change with the fill size. What changes is the quantity in the vial, the list price and the resulting cost per milligram.

At 403.91 g/mol, 50 mg is roughly 124 micromoles, and doubling the powder doubles that to about 248 micromoles. The GHK-Cu handling guide covers the identity and the colour check in more detail.

Reconstitution: double the powder, double the water

Adding water does not change the amount of peptide in the vial, only the concentration. A 100 mg vial therefore reaches the same mg/mL as a 50 mg vial if you add twice the water.

Run the water down the inside wall and swirl rather than shake, which is the same technique for either size. Give the 100 mg vial a little longer to dissolve, because there is twice the powder in one vial. How to reconstitute a lyophilized peptide has the step-by-step and the concentration formula. The GHK-Cu calculator preset does the arithmetic for both fill sizes.

Price per mg and the two-vial comparison

Two 50 mg vials cost $49.98 at list price. One 100 mg vial is $34.99, so the larger fill saves $14.99 and gives the same total 100 mg of peptide in a single container.

The larger-vial discount is not unique to GHK-Cu. AHK-Cu runs $26.99 for 50 mg and $36.99 for 100 mg, and the same pattern holds: the larger vial is cheaper per milligram. Which copper tripeptide suits your work is a separate question, covered in GHK-Cu vs AHK-Cu.

The second 50 mg vial stays dry until you reconstitute it, so there is no spoilage clock on the spare. The choice between two small vials and one large one is about how much material you want to mix at a time. GHK-Cu in Canada covers current pricing and how the product is sold as a research chemical.

Picking a size for the bench

• One container, more material: the 100 mg vial means fewer vials to label, fewer reconstructions and a lower cost per milligram.
• A smaller working quantity: the 50 mg vial makes sense if 50 mg is more than you expect to work through. Once reconstituted, a vial has a window of weeks in the fridge, so mixing only what you need is a real constraint.
• Storage either way: the dry powder keeps in a freezer near -20°C for the long term and in a fridge for a few weeks. A reconstituted vial goes in the fridge at 2-8°C, out of light, because the copper complex is light-sensitive.
• Blends: if you want GHK-Cu alongside BPC-157 and TB-500 in one vial, that is GLOW, a 70 mg vial of combined peptide content rather than 70 mg of GHK-Cu. KLOW adds KPV as a fourth component. Peptide blends vs single vials weighs the trade, is GLOW peptide supposed to be blue covers the colour, and how much GHK-Cu is in KLOW works through the blend label arithmetic.

What the report shows for either fill size

The report is tied to the batch, not to the product page, so a 50 mg batch and a 100 mg batch each carry their own numbers. For GHK-Cu, the fields to check are the same whichever vial you hold:

1. An observed mass near 403.91 g/mol, matching the expected mass for GHK-Cu.
2. HPLC purity of 99% or higher, which is the floor for every batch pepuro ships.
3. A batch code that matches the one on the vial, and a test date after the fill date.
4. A named lab that is independent of the seller.

A 100 mg fill does not get a looser standard than a 50 mg one. If the numbers on the report are for a different fill size than the label on your vial, stop and ask. How to read a peptide lab report explains each line on the page.

Every GHK-Cu vial from pepuro ships free, from our Calgary, Toronto and Vancouver distribution centers, the same business day your e-Transfer clears, with a QR code on the vial that opens its independent, third-party lab report.

For research use only. Not for human or animal consumption.