Which form of mineral should I choose?

Forms differ in absorption, stomach comfort and cost rather than in the mineral itself. Form How it behaves Suits Magnesium oxide Low absorption, laxative effect Low-cost bulk use Magnesium citrate Absorbs well, can soften stools Powders and drinks Magnesium bisglycinate Gentle, chelated Daily use, sensitive stomach Iron bisglycinate Often better tolerated People upset by sulphate Zinc picolinate or bisglycinate Chelated, well absorbed Daily top-up Calcium citrate Needs less stomach acid Older adults, acid reducers

How much can I safely take from mineral supplements in the UK?

UK guidance lists amounts from supplements that are unlikely to cause harm. These are ceilings, not targets, and they include what other products already contribute. Mineral Daily amount from supplements unlikely to cause harm Calcium 1500 mg Magnesium 400 mg Iron 17 mg Zinc 25 mg Copper 10 mg Selenium 0.35 mg Iodine 0.5 mg Phosphorus 250 mg High zinc intake lowers copper absorption over time. If you are pregnant, check the label of any multimineral for added vitamin A and ask your midwife or GP first. Source: Food Standards Scotland , NHS

Mineral Supplements: Magnesium, Zinc, Iron and More

What minerals are, and why the amounts differ so much

Minerals are nutrients your body cannot make itself. You get them from food, water or a supplement. UK guidance counts around fifteen of them as essential. Bulk minerals such as calcium, magnesium and potassium are needed in hundreds of milligrams a day. Trace minerals such as zinc, iodine, selenium and copper are needed in milligrams or micrograms. That is why a 300 mg magnesium tablet is normal, while for zinc the NHS advises staying at 25 mg a day or less from supplements unless a doctor says otherwise.

Approved claims sit with each mineral separately. Iron contributes to the reduction of tiredness and fatigue. Magnesium contributes to normal muscle function. Zinc contributes to the normal function of the immune system. Those claims apply per mineral at the amount on the label, so the panel on the back tells you more than the wording on the front. The same minerals appear in single form and inside formulas across our full supplement range.

The form on the label decides how much mineral you actually get

Two numbers matter: the weight of the compound and the elemental mineral inside it. A 1,000 mg capsule of magnesium citrate does not give you 1,000 mg of magnesium, and a good label prints the elemental amount separately. Chelated forms, meaning the mineral is bound to an amino acid so the gut absorbs it more easily, are usually gentler on the stomach than cheap oxides.

Magnesium: bisglycinate for daily use, citrate for powders and drinks, oxide mostly for low cost. Compare the options in our magnesium collection.
Iron: bisglycinate is often better tolerated than sulphate.
Zinc: bisglycinate, picolinate and gluconate all differ in how much elemental zinc they carry.
Calcium: citrate needs less stomach acid than carbonate.

How we choose the minerals we stock

We judge three things: the form, the dose and whether a combination makes sense. So we favour bisglycinate and citrate where absorption matters, and we want the elemental amount printed clearly. We leave out blends that list twenty minerals in amounts too small to matter, and we are cautious with high-dose zinc that has no copper alongside it. We buy directly from the brands, so every product is authentic, and our compliance team checks each one before it goes live. Want the full reasoning? Read how we select.

Who a mineral supplement suits, and what to expect

A mineral supplement makes sense when your diet leaves a gap: a plant-based diet without dairy or fish, heavy sweating in sport, or a stretch where you eat less varied food. It is a top-up, not a substitute for a blood test, and it does not act overnight. Give it two to three weeks of daily use before you judge the result, and longer for minerals that build up slowly in your tissue. For one clear goal, a single mineral such as zinc for daily use is easier to dose than a broad blend.

Broad formulas still have their place. If you prefer to cover several nutrients in one go, combined vitamin and mineral formulas keep a daily routine simple. Check that the minerals you actually came for are present in a meaningful amount, and check whether the formula already contains iron or zinc before you add a second product on top.

Minerals are nutrients that come from soil and water and reach you through food. Your body cannot produce them, so intake depends entirely on your diet. Most people in the UK cover their needs with varied meals, which is also the NHS position. A supplement is used when a gap is likely, for example with a restricted diet, higher losses through sweat, or a period of poor appetite. It tops up one nutrient, it does not replace food.

It depends on how you eat rather than on averages. Iron intake is a common concern for people with heavy periods or a meat-free diet, because iron from plants is absorbed less easily than iron from meat. Iodine mainly comes from dairy, fish and eggs, so it is worth checking on a plant-based diet. Zinc absorption drops when meals are high in phytates from beans, nuts and wholegrains. A blood test tells you far more than a guess.

Take a single mineral when you have one clear reason and want to control the dose, for example magnesium in the evening or iron on advice from your GP. A multimineral suits you when you simply want a broad daily base and prefer one product. The trade-off is honest: broad blends often carry modest amounts per mineral, so they cover a little of everything rather than a lot of one thing. Read the elemental amounts before you decide.

Forms differ in absorption, stomach comfort and cost rather than in the mineral itself.

Form	How it behaves	Suits
Magnesium oxide	Low absorption, laxative effect	Low-cost bulk use
Magnesium citrate	Absorbs well, can soften stools	Powders and drinks
Magnesium bisglycinate	Gentle, chelated	Daily use, sensitive stomach
Iron bisglycinate	Often better tolerated	People upset by sulphate
Zinc picolinate or bisglycinate	Chelated, well absorbed	Daily top-up
Calcium citrate	Needs less stomach acid	Older adults, acid reducers

With food is the safer default. A meal buffers the stomach, which matters most for iron and zinc, since both can cause nausea when taken on their own. Magnesium is usually taken with the evening meal, partly out of habit and partly because a laxative effect is less noticeable later in the day. If a product states a specific moment on the label, follow that. Consistency at the same time each day matters more than the perfect moment.

Minerals compete for the same absorption routes, so large amounts taken together reduce each other. The practical rule: keep calcium and iron in a separate dose a few hours apart, and do the same for high-dose zinc and copper or iron. Small amounts inside a multimineral are not a problem, because the doses are modest by design. Splitting your intake into a morning and an evening moment solves most of these clashes.

Plan on two to three weeks of daily use before you judge it, and longer for minerals stored in tissue and bone. Some effects are quicker, for instance the laxative effect of magnesium citrate, which says nothing about your mineral status. If a supplement was filling a genuine gap, changes build gradually. If nothing shifts after a couple of months, the dose, the form or the assumption behind it is worth reviewing with your GP.

UK guidance lists amounts from supplements that are unlikely to cause harm. These are ceilings, not targets, and they include what other products already contribute.

Mineral	Daily amount from supplements unlikely to cause harm
Calcium	1500 mg
Magnesium	400 mg
Iron	17 mg
Zinc	25 mg
Copper	10 mg
Selenium	0.35 mg
Iodine	0.5 mg
Phosphorus	250 mg

High zinc intake lowers copper absorption over time. If you are pregnant, check the label of any multimineral for added vitamin A and ask your midwife or GP first.

Source: Food Standards Scotland, NHS