How long do reconstituted peptides last in the refrigerator?

Reconstituted peptides typically remain stable for 2-4 weeks when refrigerated at 2-8°C (36-46°F), though some sources indicate stability up to 6-8 weeks under optimal conditions. The exact duration depends on the specific peptide sequence, with those containing cysteine, methionine, tryptophan, asparagine, or glutamine having shorter shelf lives. Using bacteriostatic water as a diluent and minimizing exposure to light can help extend stability. For longer storage, aliquoting into single-use portions and freezing at -20°C is recommended.