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Both peptides have short plasma half-lives estimated in the tens of minutes range for subcutaneous administration, which is why they produce a pulsatile GH spike rather than sustained elevation

In 1993, Nauck et al

Once mixed, the solution is stable at 28C for 28 days, but every needle puncture introduces contamination risk, so using a vial within 21 days and minimizing punctures (one draw per dose, never re-injecting air) extends usable life

The peptide calculator automates these calculations, reducing error risk and simplifying protocol implementation

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