How much zinc and magnesium to boost testosterone?

The boost premise, tested against the trials

The dose-to-boost question assumes a dial that the evidence says does not exist. Zinc's record is the clearest: Prasad's work shows deficiency lowers testosterone and repletion restores it, which is correction to normal, not elevation above it, and the authorised UK claim is worded accordingly, zinc contributes to the maintenance of normal testosterone levels in the blood. Magnesium's record is thinner: Cinar's studies reported testosterone changes with supplementation plus hard exercise in depleted contexts, small work never confirmed in well-fed men, and no testosterone claim exists for magnesium at all. The formula built on the boost premise, ZMA, was tested independently by Wilborn's group at its full label dose, 30mg zinc, 450mg magnesium, B6, and moved neither hormones nor strength in trained men. More milligrams do not rescue a mechanism that is not there.

The adequacy doses, which are the real answer

What the minerals genuinely offer is a floor, and the floor has exact numbers. Zinc: the UK reference intakes are 9.5mg a day for men and 7mg for women, so a 10mg to 15mg supplement with food covers the gap on a plate light in meat, dairy, eggs and seafood, while staying under the 25mg guidance level that protects copper status; that is the entire dose logic, and going to ZMA's 30mg nightly adds only the copper risk. Magnesium: 300mg elemental with the evening meal guarantees the 300mg male reference intake on a narrow diet under the 400mg guidance level, for its own authorised jobs, muscle function, protein synthesis, energy metabolism, reduced tiredness, none of which mentions testosterone because none of it is a testosterone effect. Two floors, fully installed for about 25p a day.

What actually moves testosterone, and the honest routine

The levers with evidence are unglamorous: sleep, because restriction measurably lowers testosterone within a week; body composition, because significant fat loss in men carrying excess raises it; progressive resistance training; alcohol kept moderate; and, for symptoms like persistent low libido, fatigue and low mood, a GP and a morning blood test rather than a supplement stack, since diagnosable low testosterone is a medical matter with real treatments. The mineral floor beneath those levers: Futuro Labs Magnesium Glycinate, 2 capsules with dinner, 300mg elemental at 80% NRV from bisglycinate at 20%, vegan, UK made under GMP and BRC, panels shown, £19.99 for 180 at 22p a day, plus 10mg to 15mg of plain zinc with the same meal on the days the plate ran short. How much zinc and magnesium to boost testosterone: no amount, and exactly those amounts to stop a poor diet from lowering it.

What to check on the label

Questions people also ask

Does zinc and magnesium increase testosterone?

Only in the correction sense: zinc repletion restores levels a deficiency lowered, and zinc maintains normal testosterone at adequacy. Nothing raises it above normal in adequate men.

How much zinc per day for testosterone?

10mg to 15mg with food, covering the 9.5mg male reference intake under the 25mg guidance level. ZMA's 30mg exceeds the level and tested null anyway.

How much magnesium for testosterone?

Magnesium has no testosterone claim; take 300mg elemental with dinner for its intake benefits, which is the same dose whatever the hope was.

Is ZMA worth it for testosterone?

The independent trial at full label dose found no change in hormones or strength in trained men. Two honest single-ingredient doses cost less and respect the ceilings.

What raises testosterone naturally?

Sleep, fat loss where there is excess, progressive training and moderate alcohol. Persistent symptoms deserve a GP and a morning blood test, not a stack.

Sources

1. Futuro Labs Magnesium Glycinate listing, Amazon UK, label and price checked 31 August 2026. https://www.amazon.co.uk/dp/B0BT7Z5VQW
2. EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on the substantiation of health claims related to zinc, including maintenance of normal testosterone levels in the blood. EFSA Journal 2010;8(10):1819. https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2010.1819
3. Prasad AS, Mantzoros CS, Beck FW, Hess JW, Brewer GJ. Zinc status and serum testosterone levels of healthy adults. Nutrition 1996;12(5):344-348. PubMed record
4. Wilborn CD, et al. Effects of zinc magnesium aspartate (ZMA) supplementation on training adaptations and markers of anabolism and catabolism. Journal of the International Society of Sports Nutrition 2004;1(2):12-20. PubMed record
5. Cinar V, Polat Y, Baltaci AK, Mogulkoc R. Effects of magnesium supplementation on testosterone levels of athletes and sedentary subjects at rest and after exhaustion. Biological Trace Element Research 2011;140(1):18-23. PubMed record
6. Expert Group on Vitamins and Minerals. Safe Upper Levels for Vitamins and Minerals. Food Standards Agency, 2003 (magnesium guidance level 400mg a day from supplements). https://cot.food.gov.uk/sites/default/files/vitmin2003.pdf
7. Department of Health. Dietary Reference Values for Food Energy and Nutrients for the United Kingdom. Report on Health and Social Subjects 41, 1991 (magnesium RNI 300mg men, 270mg women).
8. EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific Opinion on the substantiation of health claims related to magnesium. EFSA Journal 2010;8(10):1807. https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2010.1807

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