One more detail that researchers often overlook: every time you puncture the rubber stopper with a needle, you create a tiny pathway for contamination
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Standard protocols run 12 to 16 weeks followed by a 4 to 8 week break
Luo X, Cai WY, Ma HL, Cong J, Chang H, Gao JS, et al
How to Store Reconstituted Peptides Research peptides that are reconstituted with bacteriostatic water must be refrigerated at 36 to 46 degrees F (2 to 8 degrees C) and under these conditions remain viable for up to four weeks