Why the mass in the vial includes water, and changes with the air

Published 24 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
Lyophilised peptide salts are hygroscopic: they absorb atmospheric moisture, gaining mass and, over time, mobility that permits degradation. A stated mass therefore includes residual water at release, controlled and reported, and an opened vial exposed to air gains more. Net peptide content on a certificate is the figure that corrects for this.

Why peptides take up water

Charged groups and counterions attract water molecules, and a porous lyophilised cake has a large surface area. In humid air, uptake is rapid and visible as the cake slumping or glistening. GHK-Cu, with a charged lysine and a copper centre, behaves as such solids do.

The UAE climate makes this a practical matter rather than a theoretical one.

What is controlled

Residual moisture at release is measured, typically by Karl Fischer titration, and stated on the certificate. Vials are sealed under controlled conditions. That figure, with counterion content, is what converts gross mass to net peptide content.

A certificate without water content leaves the stated mass partly undefined.

After opening

Every exposure to air adds water and the mass drifts. A vial weighed weeks after opening is not the vial that was released. This is a description of the material, not a handling instruction.

GHK-Cu is supplied by REVIVE LAB UAE for laboratory research use only, with identity by mass spectrometry and purity by HPLC for the batch. It is not for human or veterinary use, and no dosing, administration or protocol guidance is provided.

What it costs

FormatStrengthPriceAvailability
GHK-Cu Pack50 mgAED 425In stock

Delivery is AED 40 flat and free on orders over AED 700. Payment is cash on delivery anywhere in the UAE, or USDT (TRC20) in advance, which takes 5% off the order total.

Frequently asked

Why peptides take up water?

Charged groups and counterions attract water molecules, and a porous lyophilised cake has a large surface area. In humid air, uptake is rapid and visible as the cake slumping or glistening. GHK-Cu, with a charged lysine and a copper centre, behaves as such solids do.

Does REVIVE LAB UAE provide dosing guidance?

No. REVIVE LAB UAE supplies research materials and provides no dosing, administration or protocol guidance of any kind. Every product is sold for laboratory research use only and is not for human or veterinary consumption.

How fast is delivery in the UAE?

Stock is held in Dubai. An order confirmed before 4 PM Dubai time is dispatched the same working day, reaching Dubai and Abu Dhabi the same day and the remaining emirates within 24 hours. Delivery is AED 40 flat and free over AED 700.

GHK-Cu Pack — in stock, dispatched from Dubai
HPLC-verified, lot certificate on every carton, 24-hour delivery nationwide. Browse the catalogue → All peptides UAE

Related reading

Supplied for laboratory research use only. Not for human or veterinary consumption. REVIVE LAB UAE provides no dosing, administration or protocol guidance.