BiomarkersTotal testosterone
Hormones
Total testosterone
The main male hormone, also important in women
On your report it may say: Testosterone, total
Testosterone supports muscle, energy, libido and bone in men, and is present in smaller amounts in women. In women, high levels are a common feature of PCOS.
Typical ranges · ng/dL
Men
Women
nmol/L = ng/dL × 0.0347
Levels peak in the morning; test before 10 am. Low results should be confirmed with a repeat.
Ranges vary by lab, age and sex. The range printed on your report applies.
If it's low
In men, low testosterone can cause tiredness, low libido and muscle loss.
Common causes
- Excess weight
- Poor sleep or sleep apnoea
- Ageing
- Some medicines
- Very low vitamin D or zinc (contributes)
What you might notice
- Low libido
- Tiredness
- Low mood
- Loss of muscle
If it's high
In women, high testosterone is common with PCOS. In men, it usually comes from hormone use.
Common causes
- PCOS (women)
- Testosterone or steroid use
- Rare hormone conditions
What you might notice
- Acne
- Excess hair growth (women)
- Irregular periods (women)
Testing
- Who should test
- Men with low libido or energy; women with irregular periods, acne or excess hair.
- How to prepare
- Morning sample before 10 am; avoid heavy exercise the day before.
- When to retest
- Repeat once to confirm a low result.
What can help
- Vitamin D3 + K2If vitamin D is low · Morning, with a fat-containing meal
- Zinc PicolinateIf zinc is low · Evening or between meals
- Ashwagandha KSM-66Modest effects in some studies · Evening (or split AM and PM)
- InositolFor women with PCOS · Morning and evening (split)
SYNC doesn't change your plan from this result alone. Use these only alongside your doctor's advice.
Food sources
See a doctor about low results in men or high results in women.
Common questions
Can supplements replace testosterone therapy?
No; they may help only when a nutrient is low.
Why test in the morning?
Levels can drop 20–30% later in the day.
Explore further
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Sources
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Build My Nutrition PlanFor general education only, not medical advice. Ranges shown are typical for adults; the range printed on your lab report applies. Talk to a qualified doctor about your results.