What Is in a Multivitamin: Typical Nutrients, Forms and Label Amounts
How to read what a multivitamin contains: which nutrients can appear, the forms and units on labels, US Daily Values, and worked label arithmetic with made-up examples.
Content last updated . This page has not been medically reviewed.
What counts as a multivitamin
NCCIH describes one survey definition of a multivitamin or multimineral as a product having 10 or more vitamins or minerals. [1] The National Institute on Aging lists 13 essential vitamins: A, C, D, E, K and the B vitamins (thiamin, riboflavin, niacin, pantothenic acid, biotin, B6, B12 and folate). [2] Minerals such as calcium, iron, zinc, magnesium, selenium and iodine also have Daily Values on US labels. [3] The sources we read do not describe a standard multivitamin formula, so labels differ; this page is about reading them. Start with the multivitamins overview.Daily Values on US labels
The FDA says the Daily Value (DV) is the recommended amount of a nutrient to consume or not to exceed each day, and %DV shows how much a serving contributes. As a guide, 5% DV or less per serving is low and 20% DV or more is high. [3] These are label reference amounts for adults and children aged 4 and older, not personal advice. Current DVs (FDA page current as of March 2024) for some common ingredients: [3]| Nutrient | Daily Value | Nutrient | Daily Value |
|---|---|---|---|
| Vitamin A | 900 mcg RAE | Calcium | 1,300 mg |
| Vitamin C | 90 mg | Iron | 18 mg |
| Vitamin D | 20 mcg | Zinc | 11 mg |
| Vitamin E | 15 mg alpha-tocopherol | Magnesium | 420 mg |
| Vitamin K | 120 mcg | Selenium | 55 mcg |
| Vitamin B6 | 1.7 mg | Iodine | 150 mcg |
| Folate / folic acid | 400 mcg DFE | Vitamin B12 | 2.4 mcg |
Different Daily Values exist for children under 4 and for pregnant or lactating women, and FDA rules can leave some percentages off labels for those groups. [4] A %DV is not an upper limit: a label can show more than 100% DV without the amount being above an official upper level, and an amount can be under 100% DV in one product and add up high across several.
Forms and units on labels
| Nutrient | Forms and units the sources describe | Why it matters |
|---|---|---|
| Vitamin A | Retinol (found in foods such as cheese, eggs and oily fish) or beta-carotene, which the body can convert; the DV uses mcg RAE [5][3] | EFSA's upper level applies to preformed vitamin A only (retinol and retinyl esters), and it says smokers should avoid beta-carotene supplements [6] |
| Vitamin D | D2 or D3; 1 microgram equals 40 IU [7][6] | Labels may show mcg, IU or both |
| Folate | Folate in food; folic acid is the manmade form [8]; DV in mcg DFE [3] | EFSA's upper level counts folic acid and certain folate salts, not folate in food [6] |
| Niacin | Nicotinic acid or nicotinamide [8]; DV in mg NE [3] | The NHS says high nicotinic acid causes flushing and long-term high doses may harm the liver [8] |
| Calcium | Label lists the weight of calcium, not of the whole salt such as calcium carbonate [4] | The Supplement Facts line shows the calcium itself, so the figure is not the weight of the whole tablet or salt |
| Magnesium | EFSA's upper level applies to readily dissociable magnesium salts and compounds like magnesium oxide in supplements [6] | Food magnesium is not counted |
Proper evidence not found in the sources we read (NHS, FDA, EFSA, NCCIH, MedlinePlus, PubMed abstracts) for which forms are better absorbed inside a multivitamin; do not assume a longer chemical name or a "methylated" form is better. See folate vs folic acid vs methylfolate and vitamin D2 vs D3.
Label arithmetic with made-up examples
The FDA says %DV is the amount divided by the Daily Value, times 100. [4] All amounts below are invented to show the arithmetic, not advice.- A label lists vitamin D at 10 mcg: 10 ÷ 20 × 100 = 50% DV. In IU, 10 mcg is 400 IU (40 IU per mcg). [7]
- A label lists iron at 9 mg: 9 ÷ 18 × 100 = 50% DV.
- A label lists zinc at 11 mg: 11 ÷ 11 × 100 = 100% DV. A second product listing 5.5 mg adds another 50% DV, so two products together reach 150% DV of zinc.
- Serving size: the FDA says one serving equals the maximum amount recommended on the label per eating occasion; if directions say 1 to 3 tablets, the serving size is 3 tablets. [4] Amounts on the panel are per serving, not per tablet.
The FDA labeling guide cited here is dated 2005, so use it for mechanics and the 2024 table for Daily Values.
Hypothetical label, ingredient by ingredient
| Ingredient | Form to look for | Hypothetical label amount | What research or official bodies cover | Where covered |
|---|---|---|---|---|
| Vitamin D | D2 or D3 | 10 mcg | Fracture prevention with calcium (USPSTF) [9] | More about Vitamin D → |
| Iron | Iron salt | 9 mg | Needs and cautions from the NHS [10] | More about Iron → |
| Folic acid | Folic acid | 400 mcg DFE | Neural tube and B12-masking advice [8] | More about Folic acid → |
| Zinc | Zinc salt | 11 mg | Copper absorption [11] | More about Zinc → |
| Calcium | Carbonate or citrate | 200 mg | Fractures and kidney stones [9] | More about Calcium → |
Other ingredients, biotin and quality
Binders and fillers that are not dietary ingredients go in a separate ingredient statement below the Supplement Facts panel. [4] Biotin in supplements can interfere with some lab tests, so tell your clinician or lab you take it. [12] The FDA is not authorized to approve supplements for safety and effectiveness before they are marketed. [13] See how to read supplement labels, quality testing and certifications and medication interactions. Ask a clinician or pharmacist if you are pregnant, have kidney or liver disease, take medicines or face surgery.
Frequently asked questions
How many nutrients make a product a multivitamin?
One survey definition cited by NCCIH is 10 or more vitamins or minerals. [1] No single formula is standard.
What does 100% DV mean?
It means a serving supplies the FDA's Daily Value for that nutrient, a label reference amount. [3] It is not an upper limit and not personal advice.
Why do labels use mcg, mg and IU?
Different nutrients use different units. The NHS notes IU conversion depends on the vitamin; for vitamin D, 1 microgram equals 40 IU. [7]
Is a higher percentage better?
No. MedlinePlus says many people think if some is good, a lot is better, but high doses of certain vitamins can be toxic. [14]
Can I add up two products?
Yes, the amounts add up, and that is how people exceed upper levels without noticing. Ask a pharmacist to check your labels together.
References
- NCCIH: Using Dietary Supplements Wisely. Read 2026-10-23.
- NIA: Vitamins and Minerals for Older Adults (content reviewed 2 January 2021). Read 2026-10-23.
- FDA: Daily Value on the Nutrition and Supplement Facts Labels (content current as of 3 March 2024). Read 2026-10-23.
- FDA: Dietary Supplement Labeling Guide, Chapter IV: Nutrition Labeling (content dated 2005). Read 2026-10-23.
- NHS: Vitamin A. Read 2026-10-23.
- EFSA: Overview on Tolerable Upper Intake Levels as derived by the Scientific Committee on Food (SCF) and the EFSA NDA Panel, version 11 (August 2025). Read 2026-10-23.
- NHS: Vitamin D. Read 2026-10-23.
- NHS: B vitamins and folic acid. Read 2026-10-23.
- USPSTF recommendation statement, Vitamin D, Calcium, or Combined Supplementation for the Primary Prevention of Fractures in Community-Dwelling Adults (JAMA 2018). Read 2026-10-23.
- NHS: Iron. Read 2026-10-23.
- NHS: Other vitamins and minerals (beta-carotene, copper, magnesium, potassium, selenium, zinc and others). Read 2026-10-23.
- FDA: Biotin Interference with Troponin Lab Tests. Read 2026-10-23.
- FDA: Information for Consumers on Using Dietary Supplements. Read 2026-10-23.
- MedlinePlus: Vitamins (encyclopedia article, reviewed 21 January 2025). Read 2026-10-23.