Applied Nutrition Zinc capsules beside three notes: empty stomach causes nausea, high doses deplete copper, most needed by heavy sweaters
Supplements-nutrition

الزنك: الجرعة والأنواع وليه التوقيت مهم — الإمارات 2026

نشر بواسطة
Oct 02 2026

الإجابة باختصار

Most adults need 8 to 11 mg of zinc a day, and food usually covers it. If you supplement, take it with a meal to avoid nausea, choose any form except oxide, and keep your total from all sources under 25 mg a day, because long-term high doses deplete copper. Heavy sweaters and vegetarians benefit most.

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References

  1. Zinc for prevention and treatment of the common cold (Nault D, Cochrane 2024)
  2. Zinc absorption by young adults from supplemental zinc citrate is comparable with that from zinc gluconate and higher than from zinc oxide (Wegmüller R, 2014)
  3. Zinc status and serum testosterone levels of healthy adults (Prasad AS, 1996)
  4. Serum testosterone and urinary excretion of steroid hormone metabolites after administration of a high-dose zinc supplement (Koehler K, 2009)
  5. Zinc-induced copper deficiency: a report of three cases initially recognized on bone marrow examination (Willis MS, 2005)
  6. Sweat iron and zinc losses during prolonged exercise (DeRuisseau KC, 2002)
  7. Dietary factors influencing zinc absorption (Lönnerdal B, 2000)

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أسئلة شائعة

How much zinc should I take a day?
Adults need about 11 mg a day (men) or 8 mg (women), and most people who eat meat or seafood get that from food. If you supplement, keep your total from food and all products under 25 mg a day, the European upper limit.
Why does zinc make me feel sick?
Zinc irritates the stomach lining, especially on an empty stomach and at higher doses. Taking it with a meal is usually enough to stop the nausea. You absorb slightly less with food, but a dose you tolerate daily beats one you skip.
What is the best form of zinc?
Citrate, gluconate and chelated forms such as bisglycinate all absorb well. Zinc oxide absorbs less: about 50% versus about 61% for citrate and gluconate in one crossover study, with some people absorbing very little of it.
Can too much zinc cause copper deficiency?
Yes. Long-term high zinc intake blocks copper absorption in the gut. Reported cases include anaemia, low white blood cell counts and nerve damage. Staying under 25 mg a day from all sources avoids this.
Does zinc raise testosterone?
Only if you are low in zinc. Correcting a deficiency restored testosterone in studies, but in men who already got enough zinc, a high-dose zinc product did not change total or free testosterone.
Does zinc prevent colds?
Not reliably. A 2024 Cochrane review of 34 trials found zinc may have little or no effect on preventing colds, but may shorten a cold that has already started, with more side effects such as nausea and a bad taste.