Cold chain

The cold chain is the unbroken temperature control of a sensitive product - from manufacture through shipping and storage to use.

Why it matters for peptides

Dissolved peptides (short protein building blocks found in many modern active ingredients) are heat-sensitive. As a freeze-dried powder (lyophilizate) they are more robust, but prolonged heat (e.g. days of summer shipping) can reduce potency. After mixing, refrigeration is usually required.

In practice

Follow the manufacturer's guidance; store refrigerated and usually avoid freezing the finished solution (unless explicitly intended).