Unreconstituted/powder form: much more durable than decades of bro science. I keep mine in a fridge for convenience but not necessary and likely full potency at room temp for at least a year
Reconstituted/mixed with bac water/liquid form ready for use (what the OP was asking as some people are quoting him the former): must be refrigerated, much less stable. A few hours makes little difference - not desirable but not nearly ruined - but a day or more will be a significant hit to potency - you can use it, won't kill you at all, but you are not getting labeled dosage anymore. See Jano's experiment in this thread on tested high purity GH reconstituted and left out at room temp (not abused just normal room temp) for 6 days. Roughly 40-50% loss. Keep it in the fridge.
Reconstituted/mixed with bac water/liquid form ready for use (what the OP was asking as some people are quoting him the former): must be refrigerated, much less stable. A few hours makes little difference - not desirable but not nearly ruined - but a day or more will be a significant hit to potency - you can use it, won't kill you at all, but you are not getting labeled dosage anymore. See Jano's experiment in this thread on tested high purity GH reconstituted and left out at room temp (not abused just normal room temp) for 6 days. Roughly 40-50% loss. Keep it in the fridge.