Molecular Stability Clock

Our calculator applies a first-order exponential decay model, with rate constants drawn from peer-reviewed stability studies for common peptides. The output is a PeptideClock model estimate, not a direct assay result: actual decay rates vary with the specific peptide formulation, pH, and storage conditions. Use it as a planning guide, and confirm critical decisions against product labeling or a stability assay.

Refrigeration (2-8°C) is optimal for most peptides, maintaining over 95% potency after 30 days. Room temperature storage (20-25°C) results in approximately 27% potency loss over the same period for standard-class peptides. These figures are model estimates from the PeptideClock first-order decay calculator, not direct experimental assay data for all peptides. Label-backed exception: Semaglutide (Ozempic) maintains potency for 56 days at up to 30°C per FDA labeling.

It depends on the specific peptide and how it is stored — there is no single number that applies to all of them. As a PeptideClock model estimate, many standard-class peptides hold usable potency for roughly 30 days refrigerated, and some longer, but fragile peptides degrade faster and label-backed products like Semaglutide follow their own FDA-specified windows. Track your specific peptide with the calculator, and always check for visual signs of degradation such as cloudiness or discoloration before use.

Yes, reconstitution with bacteriostatic water begins the degradation process. The clock starts counting from the moment of reconstitution, not from the original lyophilized powder storage.