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But Kahn and Knoepfler warn that these products could include solutions or contaminants that are toxic, and they say people should not purchase peptides without consulting with a physician

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Mixing during reconstitution creates: Unknown stability interactions Contamination risk Dosing errors you can't correct The syringe is where combining happens not the vial

Shaking the vial to speed up dissolution is the most common, and its also the one most likely to degrade the peptide rather than simply mix it