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Testosterone Free (Male)
Unbound testosterone available to tissues
Also known as: Free T
Reference Ranges
Clinical Reference
52.0 – 280.0 pg/mL
Optimal Range
100.0 – 220.0 pg/mL
Critical Range
< 20.0
/
> 400.0
pg/mL
Adult male; bioavailable fraction
Related Conditions
Hypogonadism
Low
Erectile Dysfunction
Low
Sarcopenia
Low
Food & Lifestyle Recommendations
🍎 Food
Adequate dietary fat and carbohydrate; very low-carb diets can raise SHBG and reduce free T
Macros affect SHBG
🏃 Exercise
Heavy compound lifts 3x/week; reduces SHBG and raises free T
Strength training lowers SHBG
Evidence-Backed Supplements
When Low
-
Same mechanism as total T; vitamin D supports bioavailable T
Vitamin D3 2000–5000 IU/day With meal -
Lowers SHBG, raising free T
Zinc picolinate 15–30 mg/day Between meals -
Magnesium binds SHBG, freeing more testosterone
Magnesium glycinate 300–400 mg/day Evening
Questions to Ask Your Doctor
- Is my low free T due to high SHBG binding or actual production deficit? Treatment depends on cause
- Given my free T is low, is TRT appropriate or should we address SHBG first? Treatment path depends on free/total ratio
Upload your blood test to see how your Testosterone Free (Male) compares to reference and optimal ranges.
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