NZ GLP-1 hub · Supplements · 5 November 2026 · Official regulatory source
Zinc: immunity claims, and the copper catch
General information, not advice. Supplements can interact with medicines. Talk to your doctor or pharmacist before starting one, especially if you take other medicines, are pregnant, or have a kidney or liver condition.
Why people take it
Zinc is needed for immune function, wound healing, taste and smell. People take it for colds and for immune support.
Why it comes up with GLP-1 medicines
Zinc comes mainly from meat, seafood, dairy, legumes and wholegrains, which are all foods people may eat less of on a smaller appetite. People who have had weight-loss surgery can have trouble getting enough zinc. We haven't found the same evidence for GLP-1 medicines.
What the evidence shows
Correcting a deficiency is important. Some studies suggest zinc lozenges or syrup speed recovery from a cold if taken at the start, but they don't seem to affect how severe the symptoms are.
Who should be careful
- →Long-term high intakes interfere with copper absorption and can cause copper deficiency, which can show up as anaemia and nerve problems. The Australia–New Zealand upper limit for adults is 40 mg a day.
- →Too much zinc can cause nausea, which can add to GLP-1 nausea.
- →Zinc and some antibiotics (quinolones and tetracyclines) can reduce each other's absorption. Ask your pharmacist about timing.
Food first
Oysters especially, then meat, fish and poultry. Beans, nuts, wholegrains, eggs and dairy provide some.
Sources
- NIH Office of Dietary Supplements — Zinc, health professional fact sheet
- Nutrient Reference Values for Australia and New Zealand — Zinc
- NIH Office of Dietary Supplements — Zinc, consumer fact sheet
- Kim MJ et al. — Prolonged zinc use for dysgeusia causing copper deficiency (Palliative and Supportive Care) · 2026
Review: Founder review via PR merge. General information only; no recommendations, brands, prices or product links; sources verified 5 Nov 2026.
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