Half-Life
Also known as t½
The time required for a drug's plasma concentration to drop by half — a key determinant of dosing frequency.
Definition
Half-life is the time it takes for the body to eliminate half of a given dose. It depends on absorption, distribution, metabolism and excretion. Peptides vary widely: native GHRH has a half-life of ~7 minutes; modified CJC-1295 (no-DAC) is ~30 minutes; semaglutide and tirzepatide sit at around 7 days, enabling weekly dosing. Half-life dictates not just dose frequency but how the drug 'feels' — shorter half-lives produce sharper peaks; longer, smoother coverage.
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PharmacokineticsPK
What the body does to a drug — absorption, distribution, metabolism and excretion. The science of dose-to-plasma-level relationships.
Delivery & DosingBioavailability
The fraction of a dose that reaches circulation in active form — a key reason most peptides are injected subcutaneously rather than taken orally.
PeptideCJC-1295CJC-1295 no-DAC
A GHRH analog that extends the body's natural growth-hormone pulses — typically paired with Ipamorelin for muscle preservation and sleep quality.
$149 panel.
A clinician reads it in 24 hours.
Order the Peptide Readiness Panel, draw at a Quest or LabCorp near you, and your clinician sends back a matched protocol with a confidence score.