Optimal Ranges
What is the optimal range for Zinc?
Clinical (NHS) Range
11-24 µmol/L
µmol/L
Performance-Optimised Range
14-20 µmol/L
µmol/L
| Range | Value | Unit |
|---|---|---|
| Clinical (NHS) reference range | 11-24 µmol/L | µmol/L |
| Performance-optimised range | 14-20 µmol/L | µmol/L |
The clinical range defines what is considered medically “normal” — broad enough to cover 95% of the population. The performance range reflects where research and clinical experience suggest most people feel and function at their best. A result in either range suggests typical status and is not a diagnosis; any individual reading should be interpreted by a qualified clinician.
Why It Matters
Why Zinc matters for performance
Zinc is a direct cofactor in testosterone synthesis — the enzyme that converts cholesterol to pregnenolone (the first step in steroid hormone production) requires zinc. Studies show that zinc-deficient men have significantly lower testosterone levels, and supplementation in deficient individuals can raise testosterone by up to 50%. Beyond hormones, zinc is critical for immune function: even mild deficiency increases susceptibility to infections and slows recovery. Active men are at particular risk because zinc is lost through sweat — heavy training can deplete levels significantly.
Symptoms
What are the symptoms of low or high Zinc?
Low / Deficiency
- Frequent colds and slow recovery from illness
- Loss of taste or smell
- Slow wound healing
- Hair loss
- Low testosterone symptoms (fatigue, low libido)
High / Excess
- Nausea and vomiting (acute overdose)
- Copper deficiency (zinc competes with copper absorption)
- Impaired immune function (paradoxically, at very high doses)
Dietary Sources
Which foods support Zinc levels?
Supplementation
How do you improve Zinc levels?
Zinc picolinate or zinc bisglycinate (15-30mg daily) are the best-absorbed forms. Zinc citrate is also well-tolerated. Avoid zinc oxide — poorly absorbed. Take on an empty stomach for best absorption, but if it causes nausea, take with food. If supplementing more than 30mg daily, add copper (1-2mg) to prevent copper depletion — zinc and copper compete for absorption. ZMA (zinc + magnesium + B6) is popular among athletes but evidence for performance benefits beyond correcting deficiency is limited. Don't exceed 40mg daily long-term without medical supervision.
Testing
How is Zinc tested in the UK?
Zinc is measured from a blood sample. With Helvy, that means a finger-prick kit taken at home and posted to a UKAS-accredited UK laboratory, with results in around 5 days, reviewed by a qualified clinician. Your result is reported against both the clinical range (11-24 µmol/L) and the performance-optimal range (14-20 µmol/L), so you can see not just whether you are “normal” but whether you are optimal. If you make a change, retest after 8-12 weeks to confirm it worked.
Research
Key study
Zinc status and serum testosterone levels of healthy adults
Prasad AS, Mantzoros CS, Beck FW, et al.
Nutrition (1996)
DOI: 10.1016/S0899-9007(96)80058-XRelated Biomarkers
Related Guides
Explore Zinc in depth
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Zinc is included in the Helvy 50+ biomarker panel. Get your results in 5 days with a personalised protocol.
Order Your TestThis content is for educational purposes only and does not constitute medical advice. Your data suggests areas for optimisation, but any concerns should be discussed with a qualified healthcare professional. If your results flag values outside safe ranges, we recommend consulting your GP.