how to store sermorelin: Frequently asked questions

Discard it. Sermorelin stored at room temperature (20-25°C) for 8-12 hours loses approximately 10-15% potency, and after 24 hours the loss exceeds 20%. There's no reliable way to test remaining potency without mass spectrometry. The peptide may appear visually unchanged. Clear, no cloudiness. But the N-terminal amino acids have already undergone oxidative cleavage. Using degraded sermorelin in a study introduces uncontrolled variability that invalidates results.

If the lyophilized vial remained below 0°C throughout the outage, it's fine. Check for frost inside the vial. If present, partial thawing occurred and moisture entered. Discard any vial showing visible frost on the lyophilized cake. If the vial remained fully frozen and sealed, potency is unaffected. A brief temperature rise to -10°C causes no degradation; the critical threshold is 0°C, where moisture begins interacting with the peptide.

Use a validated medical transport cooler with phase-change gel packs that maintain 2-8°C for 36 hours minimum. Place the vial in an insulated inner chamber. Direct contact with gel packs can cause localized freezing. Include a calibrated temperature data logger to document that the cold chain was never broken. Most research institutions require transport validation for biologics; if temperature exceeded 10°C at any point during transit, the peptide is considered compromised.

Check the internal temperature using a refrigerator thermometer if available. If the compartment stayed below 10°C throughout the outage, the vial is likely salvageable for short-term use (consume within 7–10 days rather than the full 28-day window). If the temperature exceeded 12°C for more than two hours, or if you cannot verify the temperature, discard the vial. Peptide degradation is a cumulative process: even if the vial 'seems fine' after one significant temperature excursion, subsequent refrigeration cannot restore lost potency, and you'll be dosing with an unpredictable concentration that makes protocol assessment impossible.

Use a dedicated insulin cooler or FRIO evaporative cooling wallet designed to maintain 2–8°C for 24–48 hours without electricity. Standard ice packs in a soft-sided cooler are insufficient because they cannot guarantee stable temperature control and risk freezing the peptide if placed in direct contact. Store the vial upright inside the cooler, cushioned with bubble wrap or foam to prevent physical agitation during transport. TSA allows medically necessary peptides in carry-on luggage with proper documentation; never check reconstituted sermorelin in checked baggage where cargo hold temperatures can exceed 30°C. Our experience shows that researchers who pre-plan their cooling strategy report zero potency loss during 48-hour trips, while those who improvise frequently discover their vials spent six hours at ambient airport temperature.

Discard the vial immediately. Do not attempt to salvage it by refrigerating it the next morning. Sermorelin exposed to room temperature (20–25°C) for 8–12 hours undergoes near-complete structural denaturation, with studies showing 85–95% potency loss within this timeframe. The peptide bonds that maintain the bioactive conformation are thermodynamically unstable at ambient temperature, and once the structure unfolds, refrigeration cannot reverse the process. Injecting a denatured peptide isn't dangerous. It simply won't work, and you'll have wasted both the dose and the remainder of the vial's intended lifespan.