What is a good IGF-1 level?

BioForge works to an optimal range rather than the lab's reference flag. For IGF-1 that is 190–267 at 40–49 or Upper third of your age band, measured in ng/mL — age dependent. A result inside the lab's normal range can still sit outside the range where most people feel and function well.

Learn · Pituitary & Adrenal Signals

IGF-1

Measured in ng/mL — age dependent

Reflects how much growth hormone you are producing. Tracks muscle repair, recovery quality and body composition.

What the numbers mean

These are the ranges BioForge works to. They are not the same as a lab's reference range, which is built from the general population rather than from people who feel well.

Low

<101 at age 40–49 · Age bands in Section 16

Optimal

190–267 at 40–49 · Upper third of your age band

High

>267 at age 40–49 · Age bands in Section 16

What moves IGF-1

Falls with age. Lowered by poor sleep, low protein intake, liver disease, and prolonged fasting. Raised by deep sleep, adequate protein, and growth hormone secretagogues. Very high values without treatment warrant a pituitary work-up.

Related markers in Pituitary & Adrenal Signals

LH FSH Prolactin DHEA-S Cortisol, AM Pregnenolone Progesterone IGFBP-3

This page is educational and is not medical advice. Ranges are general and do not account for your history, medications or symptoms — a single number never decides a protocol. Your results are interpreted by a licensed clinician alongside everything else about you. Back to the Learning Center

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Want to know where your numbers actually sit?

Every BioForge protocol starts from your own bloodwork. The first 15-to-30-minute call is free.

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