Most people should be able to get most vitamins and minerals from a varied, balanced diet. A multivitamin is most useful when it addresses a plausible dietary gap, a restricted diet or specific professional advice—not simply because taking one feels like “insurance”.
Quick answer: A multivitamin may be worth considering if you exclude several food groups, eat a limited range of foods or need a convenient way to cover several identified gaps. It is not the right tool for a diagnosed deficiency, pregnancy-specific requirements or unexplained symptoms unless a healthcare professional says so.
Commercial disclosure: We sell a multivitamin called The One. This guide is designed to help you decide whether a multivitamin is appropriate at all.
Who may find a multivitamin useful?
People with a restricted or repetitive diet
If allergies, appetite, convenience or personal choice regularly remove several food groups, the chance of a gap is higher. The answer may be better meal planning, fortified foods, a targeted nutrient or a multivitamin; it depends on what is actually missing.
People following a vegan diet
A well-planned vegan diet can provide many nutrients, but the NHS highlights vitamin B12, vitamin D, iodine, selenium and calcium as nutrients that may need fortified foods or supplements. A product must itself be vegan; do not assume every plant-focused multivitamin is. See the NHS vegan diet guide.
People who struggle to remember several separate products
One daily multivitamin can be easier to use consistently than several bottles. That convenience is a practical advantage, not proof that a wider formula is nutritionally necessary.
People advised to supplement more than one nutrient
A dietitian, pharmacist or doctor may recommend several nutrients because of diet, medicines, absorption or test results. Check that an off-the-shelf formula supplies the exact amounts and forms advised; more ingredients do not automatically make it suitable.
When is a general multivitamin not the best choice?
When you suspect a deficiency
Persistent tiredness, breathlessness, neurological symptoms or other unexplained symptoms deserve assessment rather than guesswork. For example, NHS treatment for iron-deficiency anaemia follows a blood test and investigation of the cause. A low-dose multivitamin is not a substitute for that process. See NHS iron-deficiency anaemia guidance.
During pregnancy or when trying to conceive
The NHS recommends 400 micrograms of folic acid daily before conception and through the first 12 weeks, plus vitamin D advice. It also says to avoid supplements containing vitamin A as retinol during pregnancy. Choose a pregnancy-specific product or ask a pharmacist, midwife or GP. See NHS pregnancy supplement advice.
When one nutrient is the clear gap
UK guidance says adults should consider 10 micrograms of vitamin D daily during autumn and winter, with some groups advised to take it all year. If vitamin D is your only concern, a vitamin D product may be clearer and cheaper than a broad multivitamin. Read the NHS vitamin D guidance.
When the formula conflicts with medicines
Vitamin K can affect warfarin. The NHS says not to take vitamin K supplements while taking warfarin unless this is managed with your healthcare team. Always check supplements against medicines and your medicine leaflet. See NHS warfarin advice.
A five-question decision check
- What gap am I trying to cover? Name the nutrient or dietary pattern.
- Could food or a fortified food cover it? A supplement is only one option.
- Does the recommended serving declare useful amounts? Read milligrams or micrograms and % NRV, not just the ingredient count.
- Does it contain anything I do not want? Check iron, vitamin A, vitamin K, allergens and suitability.
- How long will the pack last? Divide the number of tablets or capsules by the recommended daily serving.
What does % NRV tell you?
NRV means Nutrient Reference Value. It is a labelling reference for an average adult, not an individual requirement or upper safe limit. In supplements, 15% NRV in the recommended daily serving is normally the threshold used for a “source of” nutrition claim. Below 15% does not mean an amount does nothing; it means the relevant legal claim may not be available. Read our guide to multivitamin nutrient counts.
Where The One fits
The One provides 17 vitamins and minerals in one capsule: nine at 100% NRV, seven at 50% and iodine at 25%. It also includes fibre ingredients and two named live cultures providing 1 billion CFU. It is suitable for vegetarians, not vegans, and contains vitamin K2 and iron.
That makes it a clearly declared all-in-one option for someone who has already decided a broad formula suits them. It does not make it the right choice for everyone. Compare it with lower-cost and broader-count options in our UK multivitamin comparison.
Frequently asked questions
Should everyone take a multivitamin every day?
No. UK guidance focuses on a balanced diet plus specific supplementation advice, such as vitamin D in autumn and winter and folic acid around pregnancy.
Can a multivitamin make up for a poor diet?
It can add listed nutrients, but it cannot reproduce the full nutritional and practical value of varied foods.
Is a higher % NRV automatically better?
No. A higher number is a larger declared amount relative to the label reference. It does not prove that the product is more suitable for you.
Sources
This article was checked against the June 2026 GB food supplements guidance, the NHS pages linked above and the GB Nutrition and Health Claims Register.
Written by Barry Lees. Last reviewed 2 August 2026.
Always read the label. Food supplements are not a substitute for a varied and balanced diet and a healthy lifestyle.
0 comments