A standard multivitamin typically contains most or all of the 13 essential vitamins and a range of minerals, with the exact mix varying by brand and target audience. The core ingredients are consistent across most products, but the forms, doses, and extras can differ significantly between a basic one-a-day and a formula designed for pregnant women, older adults, or men versus women.
The 13 Essential Vitamins
Nearly every multivitamin on the market includes the same set of vitamins your body needs but can’t produce enough of on its own. These fall into two categories: fat-soluble vitamins that your body stores in tissue (A, D, E, and K), and water-soluble vitamins that pass through more quickly and need regular replenishment.
The water-soluble group includes vitamin C and the eight B vitamins: thiamin (B1), riboflavin (B2), niacin (B3), pantothenic acid (B5), B6, biotin (B7), folate (B9), and B12. Together, the B vitamins help convert food into energy, support nerve function, and play roles in making red blood cells. Vitamin C acts as an antioxidant and supports immune function and skin repair.
Fat-soluble vitamins serve different purposes. Vitamin A supports vision and immune health. Vitamin D helps your body absorb calcium for bone strength. Vitamin E protects cells from damage. Vitamin K is essential for blood clotting and bone metabolism. Because these vitamins accumulate in your body, they’re the ones most likely to cause problems at very high doses, which is why most multivitamins keep them at or below 100% of the Daily Value.
Major and Trace Minerals
Beyond vitamins, most formulas include a mix of minerals. The major minerals, needed in larger amounts, typically include calcium, magnesium, phosphorus, and potassium. Calcium and magnesium are almost always present, though often at well below 100% of the Daily Value because including a full day’s worth would make the tablet enormous. A typical multivitamin provides around 200 mg of calcium, for example, compared to the 1,000 to 1,200 mg most adults need daily.
Trace minerals appear in much smaller quantities but are still essential. Most multivitamins include iron, zinc, copper, manganese, iodine, chromium, selenium, and molybdenum. The recommended amounts for trace minerals are measured in micrograms: 55 micrograms for selenium, 45 micrograms for molybdenum, and 25 to 35 micrograms for chromium, depending on age and sex. These tiny amounts support everything from thyroid function (iodine) to blood sugar regulation (chromium) to antioxidant defense (selenium).
How Men’s and Women’s Formulas Differ
The biggest difference between men’s and women’s multivitamins is iron. Women who menstruate lose iron monthly and need more of it, so women’s formulas typically include 18 mg of iron. Men’s formulas often contain little or no iron, since men are more likely to accumulate excess iron over time. Folate is also higher in women’s formulas because of its role in preventing birth defects, even in products not specifically labeled “prenatal.”
Men’s formulas sometimes contain slightly more of vitamins A, E, K, and zinc, reflecting recommendations that scale with body size. Women’s formulas may bump up calcium and vitamin D to address the higher risk of bone loss, particularly after menopause. These aren’t dramatic differences in most cases, but they’re meaningful over years of daily use.
Prenatal Vitamins
Prenatal multivitamins are more targeted than standard formulas. The three ingredients that matter most are folic acid, iron, and iodine. Health guidelines recommend 400 to 800 micrograms of folic acid daily for anyone who could become pregnant, because it’s critical for fetal brain and spinal cord development in the earliest weeks, often before a person knows they’re pregnant. The iron recommendation jumps to 27 mg during pregnancy (up from 18 mg), and most prenatal formulas include 150 micrograms of iodine to support the baby’s thyroid and brain development.
Prenatal vitamins also tend to include more vitamin D, calcium, and DHA (an omega-3 fatty acid important for fetal brain development), though DHA sometimes comes in a separate softgel. If you’re comparing labels, folic acid and iron content are the most reliable markers that distinguish a prenatal formula from a standard women’s multivitamin.
Formulas for Older Adults
After age 50, your body becomes less efficient at absorbing certain nutrients from food. Vitamin B12 is the classic example: the stomach produces less acid with age, which makes it harder to extract B12 from meat and dairy. The synthetic B12 in supplements bypasses this problem, so senior formulas tend to include higher amounts. Vitamin D needs also increase because aging skin is less effective at producing it from sunlight. Many senior formulas provide 1,000 IU or more of vitamin D, compared to 600 to 800 IU in standard versions.
Calcium recommendations rise for older women (1,200 mg daily after age 51) and eventually for men as well (1,200 mg after age 71). Senior formulas also often reduce or eliminate iron, since the risk of iron deficiency drops after menopause and excess iron can be harmful.
Extras: Antioxidants and Plant Compounds
Many multivitamins now include ingredients that go beyond the classic vitamin and mineral list. Lutein and zeaxanthin are among the most common additions. These are carotenoids, pigments found naturally in leafy greens and egg yolks, that concentrate in the retina of your eye. They filter blue light and act as antioxidants, and research links them to lower risk of age-related macular degeneration and cataracts. Lycopene, the red pigment in tomatoes, appears in some formulas for its antioxidant properties as well.
Other common extras include coenzyme Q10 (involved in cellular energy production), various herbal extracts, and fiber blends. These “other dietary ingredients” don’t have established Daily Values, so on the label you’ll see a dagger symbol next to them with the footnote “Daily Value Not Established.” Their inclusion varies widely by brand, and the amounts are often modest compared to what you’d get from food or a dedicated supplement.
Why the Form of Each Ingredient Matters
Two multivitamins can list the same mineral on the label and deliver very different amounts to your bloodstream. The chemical form determines how well your body absorbs it. Magnesium is the best-studied example: magnesium citrate is substantially more soluble and absorbable than magnesium oxide. In one direct comparison, magnesium citrate showed roughly 55% solubility in water, while magnesium oxide was virtually insoluble. The amount of magnesium that actually reached the body (measured through urine) was dramatically higher with the citrate form.
The same principle applies to other minerals. Chelated forms of zinc and iron (bound to amino acids) tend to absorb better than their oxide counterparts. On a supplement label, you can check the form in the ingredient list or in parentheses next to each nutrient in the Supplement Facts panel. Budget multivitamins often use oxide forms to keep costs down, while higher-end products use citrate, glycinate, or other more bioavailable forms.
Inactive Ingredients
Every multivitamin tablet or capsule contains more than just vitamins and minerals. Inactive ingredients hold the product together and make it usable. Common ones include cellulose (a plant-based filler that gives tablets their bulk), silica (prevents ingredients from clumping), and stearic acid or its magnesium salt (a lubricant that helps tablets release from manufacturing molds). Coatings made from food-grade waxes or polymers make tablets easier to swallow and can prevent them from breaking down before reaching the intestine.
Gummy vitamins use gelatin or pectin as a base, along with sweeteners, colors, and flavors. These added ingredients are generally harmless, but they do mean gummies contain sugar or sugar alcohols and typically leave out iron (which tastes metallic) and calcium (which would make the gummy too large). If you’re choosing gummies for ease, know that you’re trading some nutrient completeness for palatability.
How to Read the Label
Every multivitamin sold in the U.S. must carry a Supplement Facts panel listing each dietary ingredient, the amount per serving, and the percent Daily Value (%DV). Ingredients with established Daily Values appear first, grouped with vitamins together and minerals together, followed by any extras without a DV. If you see a “Proprietary Blend,” the manufacturer is required to list the total weight of the blend and its individual ingredients in order of predominance by weight, but not the exact amount of each one.
The %DV column tells you how much of your daily need each serving covers. Values above 100% are common for water-soluble vitamins like C and B12, since excess is excreted in urine. Values well below 100% for calcium and magnesium are also normal, simply because a full dose wouldn’t fit in the tablet. When a nutrient is present but in an amount so small that the %DV rounds to zero, the label must read “less than 1%.”
Third-Party Testing and Quality
Dietary supplements aren’t tested by the FDA before they reach store shelves, but independent organizations verify quality for brands that opt in. NSF International and USP are the two most recognized certifiers. Their standards require that every dietary ingredient listed on the label is actually present at 100% of the claimed amount (for vitamins and minerals) or at least 80% (for botanical or specialty ingredients). They also test for contaminants: arsenic and lead must be below 0.01 mg per daily dose, cadmium below 0.004 mg, and mercury below 0.002 mg.
A USP or NSF seal on the bottle means the product has passed these identity, potency, and purity checks. It doesn’t mean the supplement is effective for any particular health goal, but it does mean what’s on the label matches what’s inside. If you’re comparing two similar products, the one with third-party certification offers a stronger guarantee of basic quality.