Do You Need a Multivitamin With Iron?

Walk through any supplement aisle and multivitamins can look like nutritional insurance.

One tablet contains a long list of vitamins and minerals, often providing 100% of the Nutrient Reference Value for each.

That can be useful.

But it can also create the impression that everyone should take one, or that reaching 100% on a supplement label means your nutritional needs are completely covered.

Neither is quite right.

The short version

Most people should be able to get most of the vitamins and minerals they need from a varied, balanced diet. Some people have circumstances that make particular supplements useful or specifically recommended.

A multivitamin can provide additional nutrients when your diet is limited or inconsistent, but it cannot replace the wider nutritional value of food.

Iron deserves particular attention. It is needed to make red blood cells, but not everybody needs additional iron. Heavy menstrual bleeding is one reason iron deficiency can be more likely, while excessive iron can cause side effects and very high doses can be dangerous.

And 100% NRV does not mean 100% of your personal requirement. NRVs are standard reference values used for nutrition labelling, not individual prescriptions based on your age, diet, health or circumstances.

What is a multivitamin actually for?

A multivitamin is essentially a convenient way of consuming several vitamins and minerals together.

That sounds obvious, but it helps to separate what the product actually does from what marketing sometimes suggests.

A multivitamin can add nutrients to your diet.

It cannot turn a poor diet into a balanced one.

Food provides much more than isolated vitamins and minerals. It can provide protein, fibre, essential fats and thousands of other compounds alongside the nutrients listed on a supplement label.

The NHS position is that most people should be able to obtain the nutrients they need from a varied and balanced diet, although some people may need additional supplements.

So a multivitamin is best thought of as a supplement to food, not a substitute for it.

Does everyone need a multivitamin?

No.

Someone eating a varied diet may have no obvious reason to take a broad multivitamin every day.

For other people, supplementation may make more sense.

Dietary restrictions, poor appetite, limited food variety or an identified nutritional deficiency can all change the picture.

There are also situations where UK guidance recommends particular nutrients rather than a broad multivitamin. Vitamin D is a good example, and pregnancy guidance specifically recommends folic acid and vitamin D while also warning against certain forms of vitamin A.

This is why "everyone needs a multivitamin" is not a particularly useful message.

Different people have different nutritional gaps.

Why add iron to a multivitamin?

Iron is needed to make haemoglobin, the protein in red blood cells that helps transport oxygen around the body.

If iron levels become too low, iron deficiency anaemia can develop. Symptoms can include tiredness, low energy, breathlessness and palpitations, although those symptoms can have many other causes too.

Some people are more likely to need to pay attention to iron intake.

Heavy menstrual bleeding, for example, increases the risk of iron deficiency anaemia.

But the fact that iron is important does not mean everybody should automatically take extra iron.

Can you get enough iron from food?

Many people can.

Food sources include:

• red meat
• beans and chickpeas
• nuts
• dried fruit
• fortified breakfast cereals
• some green vegetables

The NHS advises that most people should be able to obtain the iron they need through their diet.

Someone who eats little iron-rich food or loses significant amounts of blood may have different needs.

And if iron deficiency anaemia is suspected, a blood test and investigation of the cause are more useful than simply choosing whichever supplement contains the most iron.

Is more iron better?

No.

High supplemental doses of iron can cause constipation, nausea, vomiting and stomach pain.

Very high doses can be dangerous, particularly for children, which is why iron-containing supplements should always be kept safely out of their reach.

There is also an important difference between an everyday multivitamin containing iron and the iron doses that may be recommended to treat diagnosed iron deficiency anaemia.

If a clinician has diagnosed a deficiency and recommended treatment, an ordinary multivitamin should not be treated as a substitute for that treatment.

What does 100% NRV mean?

You will often see percentages next to vitamins and minerals on supplement labels.

NRV stands for Nutrient Reference Value.

NRVs are standard reference values used on nutrition labels to provide context for the amount of a vitamin or mineral present.

So if a product provides 100% NRV of a nutrient, it means the stated serving contains the amount represented by that standard labelling reference.

It does not mean:

you were previously deficient,

you personally need exactly that amount,

your diet provided none of it,

or taking 200% would be twice as beneficial.

Your actual nutritional situation depends on your diet, age, health and other factors.

The percentage is useful label information, not a personalised nutritional assessment.

Is a product with more ingredients better?

Not automatically.

A long ingredient list can look impressive, but the number of ingredients tells you very little about whether a supplement is appropriate for you.

It is more useful to ask:

What nutrients does it contain?

How much does it provide?

Am I already taking those nutrients elsewhere?

Is there a reason I need them?

Are there any ingredients that may not be appropriate for me?

This last question matters because vitamins are biologically active substances too.

They should not be treated as though unlimited amounts are harmless simply because they are nutrients.

What about vitamin A?

Vitamin A is an important nutrient involved in normal vision, immune function and the maintenance of skin and other tissues.

But vitamin A also illustrates why supplement labels deserve attention.

Some supplements contain preformed vitamin A, such as retinol or retinyl compounds.

The NHS advises pregnant women to avoid supplements containing vitamin A in the form of retinol because too much can harm a developing baby.

That means someone who is pregnant should not simply pick up an ordinary adult multivitamin without checking what form of vitamin A it contains.

Pregnancy has its own specific supplementation guidance.

Should you take several supplements together?

This is worth checking before building a supplement routine.

Someone might take:

a multivitamin,

a separate vitamin D product,

an iron supplement,

and a hair, skin and nail formula,

without noticing that several of them contain the same nutrients.

That can result in unnecessarily high total intakes.

If you use more than one supplement, compare the labels rather than considering each product in isolation.

This is particularly important for nutrients such as iron and preformed vitamin A, where excessive intake can matter.

A note about Khan Nutrition Multi-Vitamins Plus Iron

Our Multi-Vitamins Plus Iron provides 12 vitamins plus iron, with each listed nutrient providing 100% NRV at the recommended daily serving.

The directions are one tablet daily with food and water.

The tablets are suitable for vegetarians and are halal.

They are intended for adults.

The formula contains preformed vitamin A, and the product is not recommended during pregnancy or breastfeeding.

We think the most useful way to view this product is as a convenient source of multiple vitamins and iron for someone who has decided that this type of supplementation suits their diet and circumstances.

It is not a replacement for a varied diet and it is not a treatment for diagnosed iron deficiency anaemia.

Explore Multi-Vitamins Plus Iron

What is worth remembering?

A multivitamin can be convenient.

That is different from saying everybody needs one.

The best supplement choices usually start by looking at what you already eat, what you may genuinely be missing and whether there are particular circumstances that change your needs.

Iron deserves extra consideration because both deficiency and unnecessary excess matter.

And when you see "100% NRV" across a label, read it for what it is: a useful reference point for the amount supplied, not a guarantee that one tablet has solved 100% of your nutritional needs.

Sometimes a broad multivitamin makes sense.

Sometimes a more targeted supplement makes more sense.

And sometimes you may not need a supplement at all.

Sources and further reading

NHS: Vitamins and minerals
An overview of vitamins and minerals and the role of a varied, balanced diet.
Read NHS guidance on vitamins and minerals

NHS: Iron
Guidance on iron requirements, food sources, supplementation and excessive intake.
Read NHS guidance on iron

NHS: Iron deficiency anaemia
Information on symptoms, causes, diagnosis and treatment of iron deficiency anaemia.
Read about iron deficiency anaemia

NHS: Vitamin A
Guidance on vitamin A, dietary sources and avoiding excessive intake.
Read NHS guidance on vitamin A

NHS: Pregnancy vitamins and supplements
UK guidance on folic acid, vitamin D, iron and avoiding supplements containing retinol during pregnancy.
Read NHS pregnancy guidance

UK nutrition labelling guidance
Explains Nutrient Reference Values and their use as standard reference amounts for vitamin and mineral labelling.
Read the UK nutrition labelling guidance

Last reviewed: September 2026