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The post-opening discard period exists because: Sterility can no longer be fully guaranteed after first puncture Preservatives slow microbial growth but do not eliminate contamination risk Risk of contamination increases with repeated vial access For this reason, healthcare and laboratory settings typically follow a fixed discard timeframe (commonly 28 days), unless otherwise specified by the manufacturer

You are training around it instead of through it, and you are starting to wonder if this is just how it is now

Not all peptides are appropriate for every individual

[2] This stability may support sustained biological activity across laboratory settings in which many shorter synthetic peptides would undergo rapid proteolytic degradation

That value cannot be assumed to describe oral or subcutaneous exposure