What are multivitamins?
Multivitamins are dietary supplements that combine several vitamins and minerals in a single capsule, tablet, or powder. They are designed to complement daily nutrition by providing essential micronutrients that you may not always get in sufficient amounts from food alone.
A typical multivitamin contains at least vitamin D, vitamin C, B vitamins, zinc, iron, and magnesium, although the exact composition varies between products.
How do multivitamins work?
Vitamins and minerals are essential for the normal functioning of the body. They participate in hundreds of biochemical reactions — from energy production in cells to the functioning of the immune system.
The body cannot produce most vitamins on its own, so they must come from food or supplements. A multivitamin ensures that the body's daily requirements are met, especially when the diet is one-sided or demands are increased (for example, during intense training, periods of stress, or seasonal shortfalls).
Each vitamin and mineral plays its own role. Below are the EFSA-approved functions of the key components found in multivitamins.
Benefits of multivitamins (EFSA-approved claims)
The following claims are permitted only when the product contains at least 15% of the nutrient reference value (NRV) per serving for the relevant nutrient.
Vitamin D
- Vitamin D contributes to the normal function of the immune system (EU 432/2012, condition: at least 0.75 µg per serving)
- Vitamin D contributes to the maintenance of normal bones (same condition)
- Vitamin D contributes to the maintenance of normal muscle function (same condition)
- Vitamin D contributes to normal absorption and utilisation of calcium and phosphorus (same condition)
Vitamin D is particularly important in northern climates where sunlight exposure is limited from autumn to spring.
Vitamin C
- Vitamin C contributes to the normal function of the immune system (EU 432/2012, condition: at least 12 mg per serving)
- Vitamin C contributes to the reduction of tiredness and fatigue (same condition)
- Vitamin C contributes to normal collagen formation for the normal function of bones, cartilage, and skin (same condition)
- Vitamin C contributes to the protection of cells from oxidative stress (same condition)
- Vitamin C increases iron absorption (same condition)
B vitamins (B6, B12, niacin)
- Vitamin B6 contributes to normal energy-yielding metabolism (EU 432/2012, condition: at least 0.21 mg per serving)
- Vitamin B6 contributes to the reduction of tiredness and fatigue (same condition)
- Vitamin B6 contributes to normal protein and glycogen metabolism (same condition)
- Vitamin B12 contributes to normal energy-yielding metabolism (EU 432/2012, condition: at least 0.375 µg per serving)
- Vitamin B12 contributes to the reduction of tiredness and fatigue (same condition)
- Niacin contributes to normal energy-yielding metabolism (EU 432/2012, condition: at least 2.4 mg per serving)
- Niacin contributes to the reduction of tiredness and fatigue (same condition)
Zinc
- Zinc contributes to normal protein synthesis (EU 432/2012, condition: at least 1.5 mg per serving)
- Zinc contributes to the maintenance of normal testosterone levels in the blood (same condition)
- Zinc contributes to the normal function of the immune system (same condition)
- Zinc contributes to the protection of cells from oxidative stress (same condition)
Iron
- Iron contributes to normal energy-yielding metabolism (EU 432/2012, condition: at least 2.1 mg per serving)
- Iron contributes to the reduction of tiredness and fatigue (same condition)
- Iron contributes to normal oxygen transport in the body (same condition)
- Iron contributes to normal formation of red blood cells and haemoglobin (same condition)
Magnesium
- Magnesium contributes to normal muscle function (EU 432/2012, condition: at least 56.25 mg per serving)
- Magnesium contributes to a reduction of tiredness and fatigue (same condition)
- Magnesium contributes to electrolyte balance (same condition)
- Magnesium contributes to normal energy-yielding metabolism (same condition)
- Magnesium contributes to normal protein synthesis (same condition)
How to take multivitamins
Dosage
Always follow the recommended dose stated on the product label. Do not exceed the recommended daily amount.
Best timing
- With a meal — fat-soluble vitamins (A, D, E, K) are better absorbed when taken with dietary fat
- In the morning — many people prefer taking their multivitamin with breakfast to build a consistent routine
- Avoid an empty stomach — some vitamins and minerals can cause nausea when taken without food
Practical advice
If your multivitamin contains both iron and calcium, these may inhibit each other's absorption. Some manufacturers provide them in separate formulas. Vitamin C increases iron absorption, so taking them together is beneficial.
Who should use multivitamins?
Active athletes and gym-goers
Intense training increases micronutrient requirements. You lose electrolytes (magnesium, zinc) through sweat, and a higher metabolic rate increases B vitamin demands.
People with seasonal deficiencies
Vitamin D deficiency is common in northern latitudes, especially from autumn to spring when sunlight is limited. A multivitamin containing vitamin D helps bridge this gap.
People on restricted diets
Vegans, vegetarians, and those on calorie-restricted diets may not get all necessary nutrients from food. A multivitamin helps cover baseline requirements.
People with busy lifestyles
When regular and varied meals are difficult to maintain, a multivitamin helps cover potential nutritional gaps.
Frequently asked questions
Can multivitamins replace a balanced diet?
No. Multivitamins supplement the diet but do not replace it. Whole food provides fibre, phytonutrients, and other compounds that supplements cannot replicate.
Can you take too many multivitamins?
Yes. Fat-soluble vitamins (A, D, E, K) can accumulate in the body if taken in excess. Always follow the dosage stated on the label.
Do athletes need multivitamins?
People who train intensely lose minerals through sweat and have a higher metabolic turnover, which increases their micronutrient needs. A multivitamin can help cover these elevated requirements.
Are adult multivitamins suitable for children?
No. Children's multivitamins are formulated with dosages appropriate for their age and body weight. Use products designed specifically for children.
How soon will I notice the effects of a multivitamin?
The effects of micronutrients are gradual. If you are correcting a deficiency, you may notice a difference within a few weeks. In most cases, multivitamins support the body over the long term.
Can I take a multivitamin alongside other supplements?
Generally yes, but make sure the combined dose of any single nutrient does not exceed the recommended limit. For example, if you take a separate vitamin D supplement and your multivitamin also contains vitamin D, add both amounts together.
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See also:
- Vitamin D: A Science-Based Guide
- Immune Support: Vitamins and Minerals Guide
- B-Vitamins Complex: Complete Guide for Athletes
- Mineral Deficiency Signs: How to Recognize and Prevent
- Best Supplements for Women Over 40 — Vitamins, Minerals and Adaptogens
Disclaimer
A food supplement is not a substitute for a varied and balanced diet and a healthy lifestyle.
Toidulisand ei asenda mitmekesist ja tasakaalustatud toitumist ega tervislikku eluviisi.
Биологически активная добавка не является заменой разнообразного и сбалансированного питания и здорового образа жизни.
