Zinc: Common Questions
A trace mineral required for immune function, wound healing and taste.
Last revised
Zinc: the questions people actually ask, answered from published guidance.
Key takeaways
- UK reference intake, men: 9.5mg a day
- UK reference intake, women: 7mg a day
- Most useful single change: Meet requirements from food where possible.
- Commonest mistake: Long-term high-dose supplements, which can cause copper deficiency.
- See a doctor if any of the signs under "When to get help" below apply to you.
What is Zinc?
A trace mineral required for immune function, wound healing and taste.
Why does it matter?
Deficiency genuinely impairs immunity; supplementing beyond sufficiency does not improve it and can interfere with copper absorption.
UK reference intake, men for Zinc?
9.5mg a day.
UK reference intake, women for Zinc?
7mg a day.
Upper limit from supplements for Zinc?
25mg a day long term.
Main food sources for Zinc?
Meat, shellfish, dairy, bread, pulses, seeds.
What is the single most useful thing to do?
Meet requirements from food where possible.
What is the most common mistake?
Long-term high-dose supplements, which can cause copper deficiency.
When should I see a doctor?
See a GP for persistent poor wound healing, hair loss, recurrent infections or loss of taste, which can indicate deficiency but have many other causes. Do not take high-dose zinc long term without medical advice.
Where to go next
- A Q and A on Zinc
- The Short Guide to Zinc
- Zinc — the reference entry
- Gut Health and Immunity: What the Evidence Actually Says
- The Evidence on Infection Prevention at Home, Without the Hype
When to get help
See a GP for persistent poor wound healing, hair loss, recurrent infections or loss of taste, which can indicate deficiency but have many other causes. Do not take high-dose zinc long term without medical advice.
Where this comes from
- NHS — Vitamins and minerals
- British Nutrition Foundation — minerals and trace elements
How this page was put together
Every figure, recommendation and warning above is taken from the guidance named in Where this comes from. Nothing on this page is inferred, summarised or generalised beyond what those bodies publish: where they give a number, it is their number, and where they are silent, so are we. Pages are rebuilt whenever the underlying record changes. Sign-off by a named clinician, where it has happened, is shown at the top of the page along with the date.
Medical disclaimer
This article is general information, not medical advice. It cannot account for your own history, medication or circumstances. Always speak to a GP, pharmacist or another qualified health professional before making changes that affect your treatment, and never delay seeking medical advice because of something you have read here. In an emergency, call 999.
