What is a good IGFBP-3 level?

BioForge works to an optimal range rather than the lab's reference flag. For IGFBP-3 that is 3,500–6,000 or Age dependent, 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

IGFBP-3

Measured in ng/mL — age dependent

The carrier protein that transports roughly four-fifths of your IGF-1 around the bloodstream. Measured next to IGF-1, it tells us whether a growth-axis number is real or an artifact of the carrier.

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

<3,000 · Consider liver or protein intake

Optimal

3,500–6,000 · Age dependent

High

>6,500 · Read with IGF-1

What moves IGFBP-3

Tracks growth hormone output and nutrition together. Falls with liver disease, low protein intake, and poorly controlled diabetes. Rises alongside IGF-1 on growth-hormone peptide protocols — the relationship between the two is the useful signal, not either number alone.

Related markers in Pituitary & Adrenal Signals

LH FSH Prolactin DHEA-S Cortisol, AM Pregnenolone Progesterone IGF-1

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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