IGF-1 Explained: Growth Hormone's Footprint on Your Bloodwork
IGF-1 is the steadier downstream readout of growth hormone activity — and it's heavily age-dependent, so 'normal' depends on how old you are.
Why IGF-1, not GH
Growth hormone is released in pulses and is hard to capture on a single draw. IGF-1, produced largely by the liver in response to GH, is far more stable and is the practical readout of GH activity.
IGF-1 declines with age, so interpretation requires an age-adjusted frame rather than a one-size range.
In enhanced context
- Exogenous GH and certain peptides raise IGF-1; the degree depends on dose and individual response.
- Very high IGF-1 over time is a marker worth respecting; targets and safety are clinical conversations.
FAQ
It reflects growth hormone activity in a stable, measurable way. Because it falls with age and rises with exogenous GH or some peptides, it should be read against an age-appropriate frame.
Related: Fasting Glucose · HbA1c
Educational information only — not medical advice, diagnosis, or treatment, and not a recommendation about any medication or compound. Reference ranges are context estimates pending clinical review. Consult a physician about your results.