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Multivitamins: What's Inside, Timing and Overlap

Also known as multivitamin/mineral supplement, MVM, multis, daily multivitamin, prenatal vitamin, 50+ multivitamin

Short answer

A multivitamin has no standard definition, so the vitamins, minerals and amounts differ from product to product [1]. Basic ones keep most nutrients at or below the Daily Value [1]. Adding single supplements or fortified foods can push some nutrients above safe upper limits [1]. People taking warfarin should ask first about products with vitamin K [1].

Last reviewed · 3 sources

What is Multivitamins?

Multivitamin/mineral (MVM) supplements combine several vitamins and minerals, and each manufacturer chooses the mix and the amounts [1]. Taking one increases nutrient intakes and helps people get recommended amounts when food alone falls short [1]. No US government agency or professional health group promotes regular use, and a multivitamin cannot replace a varied diet [1].

Forms of Multivitamins you'll see on labels

  • Basic (broad-spectrum)

    Taken once a day; contains all or most vitamins and minerals, mostly at or below the DV, RDA or AI [1].

  • High potency

    Some nutrients well above the DV, RDA or AI, and sometimes above the upper limit (UL). May come as packs of two or more pills [1].

  • Specialized (condition-specific)

    Marketed for energy, sport, weight, immunity or eyes; often add botanicals or ingredients such as CoQ10, probiotics or glucosamine, and may exceed the UL [1].

  • Life-stage formulas

    Products for children, men, women, pregnancy and older adults give different amounts. 50+ formulas often have little or no iron and more calcium, vitamin D and B12 [1].

  • Products not called multivitamins

    Some mixes are sold under other names, such as an 'antioxidant formula' with vitamins C and E, selenium, zinc and beta-carotene [1].

How Multivitamins appears on a label

The Supplement Facts label lists each nutrient with its amount and % Daily Value (DV). The FDA sets one DV per nutrient for adults and children 4 and older, usually one of the highest RDAs or AIs [1]. Basic products keep most nutrients near the DV, but calcium, magnesium and potassium are often present only in small amounts [1]. Products with iron carry a warning that accidental iron overdose is a leading cause of fatal poisoning in children under 6 [2].

When to take Multivitamins

NIH does not name a best time of day to take a multivitamin. Vitamins A, D, E and K are fat-soluble and are absorbed more easily when dietary fat is present [3].

What to keep apart from Multivitamins

  • Single vitamin or mineral supplements

    Taking a multivitamin plus single supplements makes intakes above the upper limit more likely [1]. In one study, about half of multivitamin users had excess niacin intakes, and 10–15% had excess vitamin A, iron or zinc [1].

  • Fortified foods and drinks

    Fortified foods add to the total. For example, prenatal products plus folic acid-fortified foods can exceed the folic acid upper limit [1].

  • Warfarin and similar blood thinners

    Vitamin K can reduce how well warfarin works. Ask your doctor or pharmacist before taking any product that contains vitamin K [1].

  • Smoking (beta-carotene and vitamin A)

    Smokers, and possibly former smokers, should avoid products with large amounts of beta-carotene or vitamin A [1].

Who should ask a doctor or pharmacist first

Ask a doctor or pharmacist first if you take warfarin or a similar blood thinner (vitamin K) [1]; if you smoke or used to smoke (high beta-carotene or vitamin A) [1]; if you are pregnant, since too much preformed vitamin A can cause birth defects (UL 3,000 mcg/day for adult women) [1]; or if you already take other supplements [1]. Keep products with iron out of children's reach [2].

Keep Multivitamins in a routine that fits

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Multivitamins: questions people ask

No US government agency or professional health group promotes regular use [1]. NIH says they might help people who do not eat a variety of nutritious foods get enough essential nutrients, but they cannot replace food [1].

A basic multivitamin with amounts close to recommended intakes should be safe for healthy people [1]. The risk rises when you add other supplements or fortified foods that push nutrients above the upper limit [1].

Check the totals first. Multivitamin users who also take single supplements are more likely to exceed upper limits [1]. Your pharmacist can compare the labels.

NIH says multivitamins do not appear to reliably reduce the risk of chronic diseases [1]. The US Preventive Services Task Force found insufficient evidence to weigh benefits and harms for preventing heart disease or cancer [1].

Prenatal products generally provide no vitamin A as retinol [1]. In the US they typically contain 800 or 1,000 mcg of folic acid [1].

Formulas for older adults often contain little or no iron and more calcium, vitamin D and vitamin B12 than those for younger adults [1].

NIH does not set a time. Vitamins A, D, E and K are absorbed more easily when dietary fat is present [3].

Multivitamins with nutrients at recommended amounts do not usually interact with medicines. The main exception is vitamin K with warfarin and similar blood thinners [1].

Sources

  1. Multivitamin/mineral Supplements: Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
  2. Iron: Fact Sheet for Health Professionals — NIH Office of Dietary Supplements
  3. Vitamins — MedlinePlus Medical Encyclopedia, U.S. National Library of Medicine

Educational information, not medical advice. The amounts above are official reference values, not a recommendation for you. Check with your doctor or pharmacist before starting or changing supplements, especially if you take medication, are pregnant or have a health condition. Supin sells a subscription, not supplements. Last reviewed .

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