Compare zinc supplements on what you actually get: the amount of zinc per daily dose, the form and the cost per day. The NHS advises not taking more than 25mg of zinc a day from supplements unless a doctor advises it, so we show you how to read the label before you buy.
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How much zinc do you need a day?
The NHS says adults need 9.5mg of zinc a day for men (aged 19 to 64) and 7mg a day for women, and advises not to take more than 25mg of zinc supplements a day unless advised to by a doctor.
Good food sources include meat, shellfish, dairy foods such as cheese, bread, and cereal products such as wheatgerm, so a supplement adds to what you already eat.
What do 15mg, 25mg and 50mg of zinc mean on a label?
They are the amount of zinc per daily dose, and some products contain more than the NHS 25mg figure. The NRV (Nutrient Reference Value) for zinc is 10mg, so a 25mg tablet shows as 250% NRV.
| Zinc per daily dose | %NRV | How it compares with NHS advice |
|---|---|---|
| 7mg | 70% | The daily amount for women |
| 9.5mg | 95% | The daily amount for men aged 19 to 64 |
| 15mg | 150% | Within the NHS 25mg supplement figure |
| 25mg | 250% | The most the NHS says to take from supplements unless a doctor advises more |
| 50mg | 500% | Twice the NHS supplement figure |
"Some supplements advertise 1,000% or more of the Nutrient Reference Value, making them appear more powerful," says Andy Arshad, who runs SupplementHQ. "But a higher dose doesn't automatically mean better results, and in some cases, excessive intake can be harmful." Our guide to reading a supplement label explains %NRV in more detail.
Can you take too much zinc?
Yes. The NHS says taking high doses of zinc reduces the amount of copper the body can absorb, which can lead to anaemia and weakening of the bones. The NIH notes that doses of 50mg of zinc or more over a period of weeks can inhibit copper absorption.
Zinc is in many combination products, including multivitamins, ZMB and zinc-magnesium formulas, and vitamin C with zinc. Add up the zinc across everything you take. Speak to your GP or pharmacist first if you have a medical condition or take medication, as zinc can interact with some medicines.
Why do some zinc supplements contain copper?
Because high zinc intake reduces how much copper the body absorbs, some products add a small amount of copper alongside the zinc. This collection includes zinc and copper combinations.
The NRV for copper is 1mg. If you choose a zinc and copper product, check the amount of both on the label, and still keep zinc from supplements within 25mg a day unless a doctor advises otherwise.
Zinc picolinate, bisglycinate or citrate: which form?
They are different zinc compounds, and the evidence comparing them is limited. The NIH says absorption of zinc from supplements containing zinc citrate or zinc gluconate is similar, at around 61% in one study of young adults, compared with 50% for zinc oxide. It does not compare picolinate or bisglycinate.
The label should give the amount of zinc itself, not the weight of the whole compound, so compare that number first. This collection includes picolinate, bisglycinate (glycinate), citrate, zinc carnosine, liquid and liposomal zinc. "Where evidence is limited or inconclusive, we should say so openly," says Andy.
What is zinc good for?
Where a product is at least a source of zinc, authorised claims include "Zinc contributes to normal cognitive function", "Zinc contributes to normal fertility and reproduction", "Zinc contributes to normal DNA synthesis" and "Zinc contributes to normal macronutrient metabolism".
These describe zinc's role in a normal diet. They don't mean that taking more zinc than you need does more, and zinc is not a substitute for medical advice if you have symptoms.
Zinc and magnesium (ZMB): what's in it?
ZMB-style products combine zinc, magnesium and vitamin B6 in one dose. They are popular with people who train, but the combination itself has no authorised health claim beyond those for each nutrient.
Check each nutrient against its NHS figure: 25mg for zinc, 400mg for magnesium and 10mg for vitamin B6 from supplements. See magnesium supplements and B vitamins.
How do you compare value on zinc?
Compare the cost per daily dose and check the zinc in that dose. Tablet counts, strengths and serving sizes all vary.
How to compare value (example figures, not real products): a £5 pot of 100 tablets, 15mg each, one a day, costs 5p a day. A £14 bottle of liquid zinc giving 30 daily doses of 15mg costs about 47p a day, more than nine times as much for the same amount of zinc.
"Two products that look almost identical on the shelf can offer different value," says Andy.
Which is the best zinc supplement?
The best one for you gives the amount of zinc you're looking for, within the NHS 25mg figure, in a form and format you'll take, at a sensible cost per day. A higher dose isn't automatically better.
If you're unsure whether you need zinc at all, our guide to what supplements you actually need is a good place to start, or go back to all vitamins & supplements and multivitamins, many of which already contain zinc.
We sell the products on this page. That's our commercial interest, and it's why we show the evidence alongside them. This page is general information for adults, not personalised medical advice. Food supplements should not replace a varied, balanced diet.
Written by Andy Arshad, SupplementHQ. Last reviewed 11 October 2026.