Zinc and Men's Health: Testosterone, Fertility and Immune Function

It is not glamorous. It is not the supplement on the front cover of the men's health magazines. But the research linking zinc status to male hormonal, immune, and reproductive function is one of the more consistent stories in nutritional science.

Here is what the evidence actually says, why so many men sit at the bottom end of healthy zinc range without realising, and how to think about it as part of a sensible daily routine.

Most men do not think about zinc until something is already off. If you notice symptoms, see your GP.

There is a second reason. Zinc requirement does not stay flat through life. Hard training, frequent alcohol consumption, certain medications (particularly long-term acid-blocker use), gut conditions that affect absorption, and a diet heavy in refined grains all increase the rate at which zinc leaves the body or the difficulty in absorbing it. Modern lifestyles tilt several of those dials at once.

Zinc is an essential trace mineral, meaning the body cannot make it and must take it in through food. Zinc contributes to normal protein synthesis. Zinc has authorised health claims on the GB Nutrition and Health Claims Register for several functions directly relevant to men:

• Contribution to normal fertility and reproduction
• Contribution to maintenance of normal testosterone levels in the blood
• Contribution to normal function of the immune system
• Contribution to protection of cells from oxidative stress
• Contribution to normal cognitive function
• Contribution to maintenance of normal hair, skin, and nails
• Role in the process of cell division

These are not loose marketing claims. EFSA reviewed the evidence and authorised these statements as the ones a manufacturer is allowed to make about zinc in the UK market. Each of them ties back to peer-reviewed research, which is why zinc keeps showing up in the men's-health literature.

The link between zinc status and testosterone is one of the better-documented findings in male nutrition research. Zinc is involved in the enzyme pathways that produce testosterone in the testes and modulates the activity of luteinising hormone, which signals testosterone production. In studies on men with marginal zinc intake, restoring zinc to the recommended range has been associated with measurable changes in testosterone levels (Prasad et al., 1996, published in Nutrition).

The honest framing: this is not a "boost" story. Zinc supplementation in men who are already within the healthy zinc range does not appear to push testosterone above baseline. EFSA's authorised claim is "maintenance of normal" levels, and that is the right way to think about it.

The human prostate concentrates more zinc than almost any other soft tissue in the body. Healthy prostate tissue has zinc levels several times higher than surrounding tissue, and that ratio drops in many men as they age. Research has documented this association in the urology literature for decades, although the direction of cause and effect is still actively debated.

This is the area with the strongest population-level evidence. EFSA has authorised the claim that zinc contributes to the normal function of the immune system.

Zinc contributes to the normal function of the immune system. Maintaining intake matters more than chasing high doses.

Several common patterns push zinc status downward:

• Heavy training. Sweat is a route of zinc loss. Men training five or more times a week with significant sweat output have measurable additional zinc requirements.
• Refined diets. Whole grains, legumes, and red meat are major zinc sources. Diets dominated by refined carbs, processed foods, and limited red meat tend to run lower.
• Alcohol. Frequent alcohol consumption increases urinary zinc excretion.
• Long-term acid-blocker use. Proton pump inhibitors and similar medications reduce stomach acid, which affects zinc absorption from food.
• Gut conditions. Coeliac disease, inflammatory bowel conditions, and bariatric surgery all reduce zinc absorption capacity.

The recommended intake in the UK is around 9.5 mg per day for adult men (NHS Eatwell guidance), with a tolerable upper level around 25 mg from supplements alone. Most multivitamin formulas provide 5–15 mg as a baseline.

The best approach to zinc is the simple one: get most of it from food. The strongest food sources, ranked by zinc per typical serving, are roughly: oysters (extreme outlier — multiple times daily intake in a single serving), beef and lamb, pumpkin seeds, hemp seeds, lentils and chickpeas, cashews and almonds, oats, and Greek yoghurt.

If your diet is genuinely varied and includes red meat or shellfish a couple of times a week, you are probably fine. If it is not, or if you train hard, drink frequently, or have any of the absorption issues above, a daily multivitamin or targeted formula with zinc is a sensible addition.

Our Maca Root Multi and Vitamins Multi each give 5 mg zinc per capsule. Both are made in the UK.

Zinc is not a miracle mineral, but it is a quietly important one for men. It supports normal testosterone, immune function, fertility, and cognitive function under EFSA's authorised claims, and the patterns of modern life (training, alcohol, refined diet, certain medications) all tilt status downward. Eat well first. If your routine, diet, or training load makes that hard, a supplement with zinc is one way to top up.