Helvy
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Vitamins & Minerals
In the UK, the standard clinical (NHS) reference range for Zinc is 11-24 µmol/L, with 14-20 µmol/L considered the performance-optimised range. A result within these ranges suggests typical status; only a qualified clinician can interpret an individual reading.
Zinc is an essential trace mineral involved in over 300 enzymatic reactions. It plays critical roles in immune function, protein synthesis, wound healing, DNA synthesis, and cell division. Unlike iron or vitamin D, the body has no dedicated zinc storage mechanism — daily intake is required to maintain adequate levels. Serum zinc reflects recent intake rather than long-term stores.
Optimal range · UK
14-20 µmol/L
Performance-optimised band · clinical (NHS) range 11-24 µmol/L
Reference ranges for Zinc, not a personal result. Any individual reading should be interpreted by a qualified clinician.
Optimal ranges
| Range | Value |
|---|---|
| Clinical (NHS) reference range | 11-24 µmol/L |
| Performance-optimised range | 14-20 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
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
Low / Deficiency
High / Excess
Dietary sources
Supplementation
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
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
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
This 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.
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