Zinc: the guide

What does zinc do?

Zinc is involved in a wide range of processes, and the authorised descriptions reflect that. Zinc contributes to normal immune function, to normal cognitive function, to the maintenance of normal skin, hair and nails, to the protection of cells from oxidative stress, to normal DNA synthesis, to normal macronutrient, fatty-acid and vitamin A metabolism, to normal acid-base metabolism and to the process of cell division. That is a broad set of roles, which is why zinc turns up in immune and skin formulas alike. Those are the authorised functions. Other claims you sometimes see zinc sold on are not supported by the evidence or the rules.

How much do you need, and who is short?

The UK reference intake is about 9.5 milligrams a day for men and 7 milligrams for women. Most people meet it from food, with meat, shellfish, dairy, wholegrains, nuts and seeds among the better sources. The group most likely to fall a little short is anyone on a plant-based diet, for a specific reason covered below. For most people eating a varied diet, zinc is not something you need to chase.

Forms and absorption

Zinc comes in several forms, such as citrate, gluconate, picolinate and bisglycinate, and they differ modestly in how well they absorb, though for most people the practical difference is smaller than the marketing suggests. For a plant-based eater, what matters more than the form is the food around it. Wholegrains and legumes contain phytates, natural compounds that bind zinc and reduce how much you absorb, which is why a plant-based diet needs a bit more zinc than the headline number and why it is a nutrient worth planning for on a vegan routine.

How much is too much?

Many zinc pages skip this next point. Zinc has a fairly low ceiling for long-term supplementing, with guidance putting the upper level for adults at around 25 milligrams a day from supplements. The reason is copper: zinc and copper compete, so taking a lot of zinc over a long period can lower your copper. A stronger dose is not wrong in itself, and there are good reasons to reach for one for a while, but it is a considered choice rather than a default: it suits a clear reason and a defined stretch, not indefinite daily use on top of a diet that already covers you. Whatever strength you choose, what counts is your total zinc from everything you take, because more is not better with zinc.

Which should you choose?

If you want a small everyday insurance dose, most people need only a modest amount, and pairing zinc with vitamin C is common in immune-focused formulas. Ours is a higher-strength option, providing 35 mg of zinc (350% NRV) as zinc citrate with vitamin C from acerola. That is above the 25 milligrams a day usually given as the everyday limit for supplemental zinc, so it is better suited to shorter, purposeful use, such as a stronger immune-focused run or a spell when your intake is genuinely low, than to taking indefinitely alongside other sources of zinc. Zinc contributes to the normal function of the immune system. If you follow a plant-based diet, zinc sits alongside the other nutrients the plant-based guide flags, and the vitamin C guide covers the partner it is often paired with.