Bioavailability
The fraction of a dose that reaches circulation in active form — a key reason most peptides are injected subcutaneously rather than taken orally.
Definition
Bioavailability measures how much of an administered drug actually reaches the bloodstream in a form the body can use. Because peptides are rapidly broken down by stomach acid and digestive enzymes, oral peptide bioavailability is typically under 1%. Subcutaneous injection bypasses first-pass metabolism and delivers 70–90% of the dose to circulation, which is why the catalog is injection-forward with oral capsules reserved for specific use cases.
Read More
Subcutaneous InjectionSQ Injection
Injection into the fatty layer just below the skin — the standard route for peptide dosing, self-administered with an insulin syringe.
MechanismFirst-Pass Metabolism
The breakdown of an orally administered drug by the gut and liver before it reaches systemic circulation — the reason most peptides are injected.
Delivery & DosingLyophilisationFreeze-Drying
The freeze-drying process used to stabilise peptides for shipping — the vial you reconstitute with bacteriostatic water on arrival.
$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.