How to Choose a Multivitamin (If You Need One)
The supplement aisle makes a multivitamin look like a baseline requirement for adult life. It isn't, for most people — but for some, it genuinely helps close real gaps. Here's how to figure out whether you need one, and how to choose a multivitamin that's actually worth the money if you do.
Do You Actually Need a Multivitamin?
For most healthy adults eating a reasonably varied diet, a multivitamin doesn't meaningfully change health outcomes — most large studies have found no significant benefit for disease prevention in the general population. That surprises people, given how normalized daily multivitamin use has become.
That said, "most people" isn't "everyone." You're more likely to genuinely benefit from a multivitamin if you:
- Eat a restrictive or limited diet (vegan, vegetarian, or a diet that consistently excludes whole food groups)
- Are pregnant or trying to conceive (folic acid and iron needs rise significantly)
- Are over 50 (vitamin B12 absorption declines with age)
- Have a diagnosed nutrient deficiency or a condition affecting nutrient absorption
- Have had bariatric surgery or another procedure affecting digestion
If none of those apply, your money is often better spent on the actual foods those nutrients come from. If one or more does apply, a multivitamin can be a reasonable, low-risk way to close the gap.
What to Look for on the Label
Not all multivitamins are created equal, and "more nutrients" isn't automatically better.
| What to Check | Why It Matters | Common Issue |
|---|---|---|
| % Daily Value (%DV) | Shows how much of each nutrient you're getting relative to needs | Some products pack 500%+ DV of nutrients you don't need extra of |
| Third-party testing seal (USP, NSF) | Confirms the bottle contains what the label claims | Supplements are far less regulated than medications |
| Iron content | Needed by some, risky in excess for others | Adult men and postmenopausal women rarely need extra iron |
| Vitamin A form | Retinol vs. beta-carotene matters at high doses | Excess preformed retinol can be harmful, especially in pregnancy |
| Fat-soluble vitamins (A, D, E, K) | Build up in the body over time | Unlike water-soluble vitamins, excess isn't simply flushed out |
The third-party testing seal is worth prioritizing above almost everything else on this list — it's the difference between trusting the label and hoping it's accurate.
Reading a Supplement Facts Panel vs. a Nutrition Label
A "Supplement Facts" panel looks similar to the nutrition labels on packaged food, but it's read differently — it lists individual vitamins and minerals rather than calories, fat, and macronutrients, and %DV is the main number that matters rather than serving size comparisons. If you're comfortable reading food labels already, our guide on how to read a nutrition label correctly covers the food-label side of that skill, which transfers well once you understand what each number represents.
Who Might Actually Benefit
Beyond the groups listed above, a few specific, well-supported cases stand out: pregnant people generally benefit from a prenatal formula for folic acid and iron; older adults are more likely to be low in vitamin D and B12; and people with very limited diets — whether by choice, allergy, or circumstance — are more likely to have gaps a food-first approach alone won't close quickly. In these cases, a multivitamin isn't a substitute for a better diet, but a reasonable bridge while working toward one.
Red Flags to Avoid When Choosing a Multivitamin
- "Proprietary blends" with no individual amounts listed. If you can't see how much of each ingredient you're getting, you can't evaluate whether it's a reasonable dose.
- Megadoses of fat-soluble vitamins. Because A, D, E, and K build up in your body, chronic overdosing is a real risk in a way it generally isn't for vitamin C or B vitamins.
- Marketing claims about curing fatigue, boosting immunity, or preventing disease. A multivitamin fills nutritional gaps; it isn't a treatment for anything, and claims that suggest otherwise are a sign to look elsewhere.
- Unusually cheap, unbranded products with no testing certification. This is one area where paying slightly more for a tested, reputable brand is a reasonable trade-off.
According to the NIH Office of Dietary Supplements' consumer fact sheet on multivitamin/mineral supplements, most people who eat a varied diet get enough vitamins and minerals from food alone, and a multivitamin should supplement — not replace — a reasonably balanced diet. For more evergreen, no-hype health guides, browse the health category.
This article is general information, not medical advice. Talk to a doctor or registered dietitian before starting any new supplement, especially if you take medication or have an existing health condition.