How Long Does Reconstituted GHK-Cu Remain Stable for Research Use?

GHK-Cu ships as a blue-tinted lyophilized powder, stable at −20°C when sealed, desiccated, and protected from light. Once sterile water is added, that stability window shortens considerably, and light protection becomes even more important than it is for many other peptides in the catalog, given the copper complex's sensitivity.

Refrigeration at 2–8°C is standard for the reconstituted solution, with roughly 30 days commonly referenced as the practical usable window in research handling notes — though this can vary with storage conditions and should not be treated as a guaranteed figure for every batch.

The blue color itself is a useful visual check: reconstituted GHK-Cu should remain visibly blue-tinted. A solution that turns clear, cloudy, or shows unexpected discoloration should be treated as unusable regardless of how long it has been stored.