HOME/BIOMARKERS/FREE T
hormonal · pg/mL

Free Testosterone

The unbound, biologically active fraction of testosterone. More relevant than total for tissue effects.

DIRECTION
↑ higher is better
NORMAL RANGE
9–30 pg/mL (adult male)
MECHANISMS
2

What
moves it.

These biological pathways influence Free Testosterone. Click any to see what affects it.

supported
Aromatase
Aromatase Inhibition

Aromatase converts testosterone into estradiol. Inhibiting it keeps more testosterone as testosterone.

emerging
SHBG
SHBG Modulation

SHBG binds testosterone, making it inactive. Lower SHBG = more free testosterone.

What
affects it.

botanical
Eurycoma longifolia (Tongkat Ali)

Human RCTs show testosterone increase in hypogonadal men [citation:37]. Aromatase inhibition shown in vitro.

supported$$
mineral
Boron

May lower SHBG and raise free testosterone. Small studies.

emerging$