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Hormones
IGF-1
Emerging biomarkerHormonalBloodng/mL
A growth-factor measurement linked to growth-hormone signaling.
What it measures
Circulating insulin-like growth factor 1.
Why it matters
Clinically used in evaluation of growth-hormone disorders and studied extensively in aging biology.
How to interpret it
Interpret using age-adjusted assay ranges and clinical context.
Important limitations
Associations with aging and mortality are complex and do not support a simple lower-is-better or higher-is-better longevity target.
Evidence status
Emerging biomarker
Biologically important aging pathway marker, but not a validated longevity optimization target.
Research & guidance
Original papers, validation studies, reviews and clinical guidance connected to this measurement.
For education and evidence exploration, not diagnosis or individualized medical advice.