Accepted answer
Start with the physical state. Lyophilised powder is stable at ambient for the duration of any normal lane; anything in solution is a different conversation entirely.
Tracking quality is the more informative signal: continuous scanning at every hop indicates a real logistics chain, and a tracking number that goes dark for a week indicates something else.
Anything shipped in solution is a genuinely different risk, because hydrolysis and deamidation proceed in the aqueous phase and are strongly temperature-dependent.
Solid-state stability of lyophilised peptides at ambient is well documented in formulation studies, with residual moisture as the dominant variable.
Nothing here is medical advice, and research-use compounds are not approved for human use.
Buy a data logger if the temperature history genuinely matters to you.
Confirming that a parcel sitting at a facility for six days moved the moment the paperwork was queried and answered. – orla_sheridan 10 months ago 8Same experience here, different supplier. – orla_ferriter 8 months ago add a comment