Investigations › Supplements
Investigation No. 13 · Supplements
“Multivitamins are pointless”
For preventing cardiovascular disease or cancer in healthy adults, the US Preventive Services Task Force found the evidence insufficient to say either way. That is not the same as pointless.
At a glance
- Verdict
- Partly true
- Certainty in the evidence
- Low, starting at High and moved by 2 domains
- Evidence base
- USPSTF evidence review, community-dwelling adults
- Last reviewed
- 11 Sept 2026
- Next review due
- Sept 2027
How people actually say it
- “They’re just expensive urine.”the line everybody repeats, about one outcome only
- “I take one as insurance.”which is a different goal from preventing cancer
Why this verdict and not the next one
Partly true rather than mostly false, because the claim holds for the outcome most people mean by it and fails for the groups where intake is genuinely restricted. The boundary is what the claim omits.
Where the claim came from
From a real finding stated about one outcome and then generalised to all of them. The trials that produced the pointless headline were asking whether a multivitamin prevents cardiovascular disease and cancer in people already eating adequately. That is a narrow question with a defensible answer, and it is not the question most people are asking when they take one.
What the studies did
The US Preventive Services Task Force commissioned a review of randomized trials of single nutrients, nutrient pairs and multivitamins for preventing cardiovascular disease, cancer and mortality in community-dwelling adults. It reached moderate certainty that beta-carotene does more harm than good and that vitamin E has no net benefit. On multivitamins it concluded the evidence was insufficient to determine the balance of benefits and harms.
Why these papers and not others
A guideline body’s commissioned review was used because it searched systematically and reports its own certainty. A guideline is a reading of evidence rather than evidence, and the entry says so.
The full search and appraisal protocol, including what gets excluded and why, is set out in the method.
The evidence, study by study
| Study | Design | n | What it found | What it cannot say |
|---|---|---|---|---|
| Mangione 2022, USPSTF | Commissioned evidence review and recommendation statement | — | Moderate certainty that the harms of beta-carotene outweigh the benefits. Moderate certainty of no net benefit from vitamin E. Insufficient evidence to determine the balance for multivitamins. | Anything about people with restricted intake, post-bariatric, pregnant, or with a diagnosed deficiency, none of whom were the population reviewed |
How the certainty grade was reached
Certainty starts at a level set by the study design, then moves down for every domain that fails a written threshold and up for every domain that clears one. The arithmetic is shown rather than asserted.
What the evidence cannot say
Address anybody whose intake is actually restricted. Somebody eating meaningfully less on a GLP-1, somebody post-bariatric, somebody vegan, somebody elderly and eating little: none of those were the population under review, and the conclusion does not transfer to them.
One person, worked through
Somebody nine months into a GLP-1, eating perhaps half of what they used to, reads that multivitamins are pointless and stops taking one. The evidence behind that headline was collected in people eating normally, which is the one thing that is no longer true of her.
Whether this applies to you
A verdict is a reading of a population. Whether it describes you depends on the things below, and any one of them can change what the right move is for you.
- Whether your intake is actually restricted is the variable that decides this, and it is the one the headline ignores
- Post-bariatric, pregnant or vegan are each their own literature with their own answer
- What you are hoping it will do since preventing cancer and covering a gap are different goals with different evidence
- Beta-carotene and high-dose vitamin E are the two the same review flags as net harmful, which is a stronger statement than insufficient
What would change this entry
Trials in the groups where intake is restricted, which is where the claim actually bites and where the evidence is thinnest.
Read this before you act on it
This is an appraisal of published evidence, not medical or nutrition advice, and it is not a substitute for care from a clinician who knows your history, your medications and your labs. Nothing here is a diagnosis, a prescription or a treatment plan, and reading it does not create a clinician and patient relationship.
Do not start, stop or change a medication, a supplement or a diet on the strength of this page. If you are pregnant, breastfeeding, managing kidney or liver disease, diabetes, an eating disorder or any chronic condition, the general reading above may not describe you at all. Talk to your physician or a registered dietitian first.
The verdict above was true to the evidence on 11 Sept 2026. Evidence moves. Check the review date.
References
- Mangione CM, Barry MJ, Nicholson WK, Cabana M, et al; US Preventive Services Task Force. Vitamin, mineral, and multivitamin supplementation to prevent cardiovascular disease and cancer: US Preventive Services Task Force recommendation statement. JAMA. 2022 Jun 21;327(23):2326–2333. doi:10.1001/jama.2022.8970. PMID 35727271.
