You Don't Need 27 Supplements
The honest, evidence-ranked triage on supplements: about six in ten US adults take one, but most of that drawer has never been shown to extend life. Here is a short list that actually clears the bar, and a 5 minute way to audit the rest.
In-house · synthesized from the cited primary sources
At a glance
Moderate This is the largest, longest study on the single most common supplement, and it sets the honest baseline for the rest of the drawer.
What the evidence says
See what the biggest study found
In about 390,000 healthy US adults followed a median of 23.5 years, daily multivitamin use was not linked to lower mortality (HR about 1.04). See the full multivitamin breakdown on its own page: Do Multivitamins Help You Live Longer?
Why ↓
This is the largest, longest study on the single most common supplement, and it sets the honest baseline for the rest of the drawer.
Loftfield et al., JAMA Network Open 2024 (PMID 38922615, NIH/NCI)
See the scale of the habit
About six in ten US adults (57.6%) use at least one dietary supplement; most have not been shown to move mortality risk in adults without a deficiency
Why ↓
The habit is nearly universal, which is exactly why an honest evidence check matters.
CDC/NCHS Data Brief 399, NHANES 2017-2018
See which supplements have real evidence, and for whom
Creatine monohydrate: strong evidence for strength and muscle, suggestive for cognition and aging. Vitamin D: worth it only if you're low or deficient, a large trial found no benefit in adults who already had adequate levels. Omega-3: mixed and modest, about 8% lower heart-attack risk in one analysis, an effect that shrinks in higher-quality trials, food sources first. Magnesium: reasonable if your intake is low, about 48% of Americans fall below the recommended intake
Why ↓
Each entry here is conditional, not a blanket recommendation: the evidence tier and the 'for whom' both matter.
Manson et al., NEJM 2019 (PMID 30415629); Hu et al., JAHA 2019; NIH ODS Magnesium Fact Sheet
See what actually moves mortality risk
About 1 hour a week of strength training is linked to up to about 27% lower all-cause mortality. Each extra 1,000 steps a day is linked to about 15% lower mortality, with about 7,000 steps a day a realistic target. Neither comes in a bottle
Why ↓
These effect sizes are larger and better supported than almost anything in a supplement drawer, and they cost nothing.
Shailendra et al., Am J Prev Med 2022; Paluch et al., Lancet Public Health 2022
Run a 5 minute stack audit
For every bottle in your cabinet, ask three questions: what am I taking this for, how strong is the evidence really, and is my intake or level actually low. Keep the 2 to 3 that pass all three, and stop buying the rest: if a supplement fails one of these questions, the honest move is to save the money, not keep taking it on faith.
Why ↓
Most supplements fail one of these three questions; running through them filters the drawer down to what is actually earning its place.
Loftfield 2024 / Manson 2019 / Hu 2019 / NIH ODS
The evidence 5
Moderate This is the largest, longest study on the single most common supplement, and it sets the honest baseline for the rest of the drawer.
Dietary Supplement Use Among Adults: United States, 2017-2018 (NCHS Data Brief No. 399, CDC)
Magnesium Fact Sheet for Health Professionals (NIH Office of Dietary Supplements)
Multivitamin Use and Mortality Risk in 3 Prospective US Cohorts (Loftfield et al., JAMA Network Open, 2024)
Vitamin D Supplements and Prevention of Cancer and Cardiovascular Disease: The VITAL Trial (Manson et al., NEJM, 2019)
Resistance Training and Mortality Risk: A Systematic Review and Meta-Analysis (Shailendra et al., Am J Prev Med, 2022)
Not medical advice. This page is for education only and is not a substitute for professional medical care. Consult a qualified clinician before changing your health routine.
Editorial disclosure. This protocol is written and fact-checked by the YourProtocol editorial team directly from the primary sources cited below; it is not written or reviewed by any outside expert.
Is this for you
- Anyone with a big supplement drawer and no clear reason for half of it
- People wondering which supplements are actually worth the money
- Anyone who wants an evidence-ranked shortlist instead of a hundred-item list
- People who would rather spend on sleep, food, and training than more bottles
Cautions
- This is not a claim that all supplements are useless: creatine, vitamin D (if low), omega-3, and magnesium (if low) each have a real, conditional evidence base described above
- The omega-3 and vitamin D benefits are conditional on your starting level or intake being low; in already-replete adults, added supplementation has not shown the same benefit
- The 'about 27% lower mortality' and 'about 15% lower mortality' figures for strength training and steps are 'linked to' associations from cohort studies, not proof that the behavior itself causes a longer life
- This page gives no doses for prescription-only compounds; talk to a doctor before starting any new supplement, especially if pregnant, on medication, or managing a health condition
- Educational only, not medical advice
Common questions
Do I need to take a lot of supplements to be healthy?
No. Most supplements have never been shown to help a healthy person live longer. A short list clears the evidence bar (creatine, vitamin D if you're low, maybe omega-3 or magnesium if your intake is low), and the biggest levers for longevity, sleep, protein, strength training, walking, are free.
Which supplements actually have real evidence?
Creatine monohydrate has strong evidence for strength and muscle. Vitamin D helps if you are actually low or deficient. Omega-3 shows a mixed, modest benefit, food sources first. Magnesium is reasonable if your intake is low, which is true for roughly 48% of Americans. Each is conditional, not a blanket recommendation.
Are multivitamins a waste of money?
For a healthy adult hoping for a longevity benefit, the largest study to date (about 390,000 adults, 23.5 years of follow-up) found no mortality benefit. See the full multivitamin page for the exceptions (diagnosed deficiencies, pregnancy-related folic acid).
What matters more than supplements?
About 1 hour a week of strength training is linked to up to about 27% lower all-cause mortality, and each extra 1,000 daily steps is linked to about 15% lower mortality, with about 7,000 steps a realistic target. Those effects are larger than almost anything in a supplement bottle, and they're free.
How do I know which supplements to keep?
Run a 5 minute stack audit: for every bottle, ask what you're taking it for, how strong the evidence really is, and whether your intake or level is actually low. Keep only the ones that pass all three questions.