Some more sensitive compounds don't tolerate the benzyl alcohol preservative well and are better suited to preservative-free sterile water or saline, even though this typically means the reconstituted solution should be used sooner rather than stored for weeks
It can also reflect iron deficiency, blood sugar instability, hormone shifts, nervous system dysregulation, or chronic stress
This means tesofensine affects norepinephrine most potently, dopamine second, serotonin third
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That same rigidity affects chromatographic behavior, so laboratories verifying identity by HPLC should expect retention characteristics distinct from comparable-length linear peptides