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Description
P-21 ships as a 5 mg lyophilized (freeze-dried) vial, so anyone following the subcutaneous route community sources describe has to reconstitute it with bacteriostatic water first the same mechanical step as any injectable peptide

The 2 mg starting point from the phase 2 trial was specifically designed for this scenario, since the trial participants included people with varying levels of prior medication exposure
it's a requirement to maintain potency

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