IGF-1
Also known as Insulin-like Growth Factor 1 · Somatomedin C
The primary blood marker of growth-hormone activity — the lab that gates any GH-axis protocol and the one re-checked at month 3.
Definition
Insulin-like Growth Factor 1 is secreted by the liver in response to pituitary GH and mediates most of GH's peripheral effects on muscle, bone and soft tissue. Because IGF-1 has a ~15-hour half-life, it reflects average GH output more reliably than GH itself. It's the baseline required before P2 and P4; the therapeutic target is the upper half of age-adjusted range. Values above the reference range prompt dose reduction.
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Growth HormoneGH
A pituitary-secreted hormone that drives protein synthesis, fat metabolism and tissue repair — released in pulses, peaking at night.
MechanismGHRH AnalogGrowth-Hormone-Releasing Hormone Analog
A class of peptides that mimic growth-hormone-releasing hormone at the pituitary to trigger the body's own GH release — CJC-1295, Tesamorelin and Sermorelin.
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.