The Truth About Multivitamins: Are They Worth Taking?

Multivitamins are the most commonly taken supplement in the UK, yet they also spark the most debate. Some experts call them essential insurance, while others dismiss them as expensive urine. So who's right?

Food supplements are meant to add to a varied, balanced diet, not to replace it. Processed foods, stress, medication use, and lifestyle factors can further deplete nutrient stores.

A multivitamin adds a set amount of vitamins and minerals to your daily diet. This is particularly relevant for specific groups:

• Women of reproductive age: Need extra iron, folate, and iodine
• Vegetarians and vegans: May lack B12, iron, zinc, and omega-3s
• Older adults: Often struggle with B12 absorption and vitamin D synthesis
• Athletes: Have increased demands for B vitamins, magnesium, and zinc

Critics argue that if you eat a balanced diet, supplementation is unnecessary. There are also concerns about potential harm from excessive intake of certain nutrients (particularly fat-soluble vitamins A, D, E, and K) and the risk of creating a false sense of security about health.

The largest study on multivitamins — the Physicians' Health Study II — followed over 14,000 male physicians for more than a decade.

Vitamin B12 contributes to the reduction of tiredness and fatigue, and iron contributes to normal cognitive function. The key takeaway: multivitamins are most beneficial for those who need them most — people with dietary gaps or increased requirements.

Quality matters more than quantity. Check the label for the form of each vitamin and the amount in each capsule. Avoid products with excessive doses of any single nutrient or unnecessary fillers. Some formulas also contain plant extracts and live cultures; these have no authorised health claim.

The difference between a poor multivitamin and a good one is enormous. Here is what separates them:

• The form: the label names the form of each vitamin and mineral, for example vitamin D3 (cholecalciferol).
• No mega-doses: A good multivitamin provides 100–200% of the NRV (nutrient reference value) for most nutrients. Mega-doses of water-soluble vitamins are simply excreted, while excess fat-soluble vitamins can accumulate to harmful levels.
• Added botanicals: some multivitamins also contain plant extracts such as turmeric, green tea or grape seed.
• Appropriate for your demographic: Men, women, over-50s, and athletes all have different nutritional needs. Choose a formula designed for your specific group rather than a generic one-size-fits-all product.
• Transparent labelling: Every ingredient and its amount should be clearly listed. Avoid products that hide behind proprietary blends or use vague terms like "vitamin complex."
• UK-made and GMP-certified: Ensures the product meets strict UK safety and quality standards with consistent potency.

A daily multivitamin may be particularly beneficial for:

• Anyone whose diet is not always varied and balanced
• Vegetarians and vegans who may miss B12, iron, zinc, and iodine from plant-only diets
• Adults over 50 — nutrient absorption declines with age, and needs for certain vitamins increase
• Women planning pregnancy (folate contributes to maternal tissue growth during pregnancy)
• People on calorie-restricted diets, who are at higher risk of micronutrient gaps
• Athletes with increased metabolic demands for B vitamins, magnesium, and zinc

Take your multivitamin with your largest meal of the day — the fat content improves absorption of fat-soluble vitamins (A, D, E, K). Avoid taking it with tea or coffee, as tannins and caffeine can reduce mineral absorption. If your multivitamin contains iron and calcium, they can compete for absorption — some brands split these into separate tablets for this reason. Take it every day as directed on the label. A multivitamin complements a healthy diet — it does not replace one. Continue eating a varied diet rich in whole foods alongside your supplement.

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This article is for informational purposes only and does not constitute medical advice. Vitadefence supplements are food supplements, not medicines. They should not be used as a substitute for a varied diet and a healthy lifestyle. Consult a healthcare professional if you are pregnant, breastfeeding, on medication, or have a medical condition.