Lyophilised powder or solution: what the form of a vial means for buying and storing it

Written 23 September 2026 by the trade desk. About 1 minute to read.

Almost every peptide on this list is a freeze-dried powder. A handful of lines are liquids. The difference changes how the vial is labelled, tested and stored, so it is worth knowing which is which before you order.

Lyophilised powder

The peptide is dissolved, filtered, filled into the vial and freeze-dried there, leaving a dry cake under vacuum or inert gas. The label states milligrams of material per vial. It is stable at minus 20 degrees Celsius for the shelf life on the certificate, tolerates a short spell at ambient temperature in transit, and is reconstituted with bacteriostatic or sterile water when it is used. Purity, identity, water content and residual solvents are all tested on the dry material.

Aqueous solution

The lipotropic blends and the carnitine line are compounded, filtered and filled as a liquid, normally 10 mL per vial. The label states the total active content per vial rather than a peptide weight, and where the line is a blend the certificate lists each component. Solutions are stored at 2 to 8 degrees Celsius, never frozen, and there is no water-content test because water is the vehicle.

How to tell them apart on the list

The release limits table on each compound page says which form the line takes: a powder table carries water content and a minus 20 storage line, a solution table carries a 2 to 8 storage line and a "do not freeze". Bacteriostatic water is a solution too, and is stored at room temperature.

Why it matters for a shipment

Powder and solution can share a carton, but a solution must not be frozen on arrival and a powder must go back to the freezer. If a consignment mixes the two, split them at goods-in before anything goes into storage.

Applies to

L-Carnitine, Lipo-C lipotropic blend, with B12, Bacteriostatic Water, among others. Every compound.

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