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Description
The answer is more nuanced than a simple yes or no

An authentic HPLC report from Core Peptides typically shows a Sharp, singular peak on the chromatogram, indicating a lack of significant impurities or truncated sequences

Thus, it seems that DSIP may indeed play a role in altering physiology in preparation of the body for sleep, as some of it effects occur before neurological and behavioral signs of sleep
Bacteriostatic Water for Injection, USP
Food Chem 233 , 429433 (2017)
Oxidation: Product may gradually oxidize over time when exposed to air, heat, or humidity
