Free Testosterone(FT)
Free testosterone is the unbound, biologically-active fraction of total T — what actually crosses cell membranes and activates androgen receptors.
Optimal range
150–250pg/mL
Clinical "normal"
50–210 pg/mL
Avg. cost (US)
$95
Test frequency
With total T, every 3–6 months
When to measure
Same draw as total T, fasted, 7–9 AM. Calculated values (from total T + SHBG + albumin) are usually preferred over direct assays.
How to measure
Calculated from total T + SHBG (Vermeulen formula) is gold standard. Direct assays exist but vary in accuracy.
Average cost
≈ $95 cash price. Often covered by insurance with relevant ICD-10.
Signs your level is off
Symptoms if low
Erectile dysfunction, mood swings.
Symptoms if high
Similar to TT high.
If your level is low
Boron >10 mg: hormonal imbalance
Supplement
Boron· 6-10 mg/day
Form: Boron glycinate
Reduces SHBG binding.
Foods
- Fatty fish
Lifestyle
- Intermittent fasting
Medication (if prescribed)
hCG· 500 IU 3x/week
Form: Injectable
Reference only. Speak with a licensed clinician before any prescription intervention.
Caution: Boron >10 mg: hormonal imbalance
If your level is high
GI upset
Supplement
Calcium D-Glucarate· 500 mg/day
Form: Capsule
Enhances estrogen excretion.
Foods
- Flaxseeds
Lifestyle
- Limit endurance cardio
Medication (if prescribed)
Anastrozole· 0.25 mg/day
Form: Oral
Reference only. Speak with a licensed clinician before any prescription intervention.
Caution: GI upset
Test these together
These biomarkers contextualize Free Testosterone and unlock a clearer picture than any single value can.
Deeper reading
Protocols that move this marker
Selected studies
EMAS 2025 PubMed
The prime report
Weekly performance intelligence.
New studies, protocols, and optimization frameworks delivered every Monday. No fluff, no motivation quotes — only what moves the needle.