With a variety of metal ions that could bind competitively with the chelator (e.g., calcium, magnesium, zinc, copper, manganese, and other metals, that typically exceed concentrations of toxic elements), the identity of the metal predominately bound by a chelating agent depends both upon accessibility of the chelator to the tissues, how strongly the metal is already bound in the tissues, how strongly the metal binds to the chelator, and to some extent the relative quantities of various ions [1]
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Hypersensitivity reaction to cyanocobalamin
Structural modifications allow them to stay in circulation for hours or even days: IGF-1 LR3 : 2030 hour half-life CJC-1295 with DAC : 58 day half-life PEG-MGF : detectable for up to 12 weeks Pharmacokinetic enhancements such as PEGylation or fatty acid acylation extend the peptides residence time, reduce renal clearance, and improve therapeutic utility. Veronese & Mero, BioDrugs What Determines How Long Peptides Stay in Your System