Cold chain

Freeze-dried powder is considerably more robust than reconstituted solution. That is why most of this category ships as powder and often ships without refrigeration at all. That is a real tolerance — not a corner being cut — but it has limits nobody publishes for these compounds.

Once reconstituted, the tolerance largely disappears. Fridge life for a mixed vial is counted in days to weeks and is compound-specific, which our profiles state per compound rather than generally.

A vial that arrived warm cannot be assessed by looking at it. Appearance tells you about gross problems, discolouration and particles, and nothing at all about potency.