What the evidence says. Graded mixed: long-term RCTs show no effect on heart attack, stroke or mortality and only a small (~8%) cancer reduction in one trial, while newer COSMOS data suggest a modest cognitive benefit; the USPSTF rates the evidence insufficient (I statement) for disease prevention. (Mixed evidence: Conflicting results across studies; benefit uncertain.)
What is Multivitamins?
Multivitamins (Multivitamin–multimineral (MVM) supplements) is a vitamin used for prevents or corrects dietary micronutrient shortfalls. NutriDex grades the human evidence as Mixed. Multivitamin–multimineral (MVM) supplements combine most essential vitamins and minerals at roughly daily-requirement doses and are the most widely used supplement. Their clear role is filling gaps: pregnancy (folic acid), bariatric surgery, restrictive diets and older adults who eat poorly. For preventing chronic disease, results are underwhelming. In the Physicians' Health Study II (14,641 men, about 11 years), a daily MVM cut total cancer by 8% (HR 0.92) but had no effect on heart attacks, strokes or cardiovascular death. A meta-analysis of 18 studies (about 2 million people) found no link with cardiovascular mortality, and a 2024 cohort of 390,000 adults found no survival benefit. The 2022 USPSTF review judged the evidence insufficient to recommend MVMs for preventing heart disease or cancer. More encouragingly, the COSMOS trials found older adults taking an MVM had slightly better memory over 2–3 years (equivalent to about 2 years less cognitive aging) and small shifts in epigenetic aging clocks, findings that still need independent replication.
Purported Benefits
✓Prevents or corrects dietary micronutrient shortfalls
✓Small reduction in total cancer in one long trial (PHS II)
✓Modest slowing of memory decline in older adults (COSMOS)
✓Standard care in pregnancy (prenatal), after bariatric surgery and in restrictive diets
Dosing & Compounds
Typical Dose
One standard daily MVM supplying roughly 100% of recommended daily values (the dose used in PHS II and COSMOS); avoid 'mega-dose' formulas.
Active Compounds
Vitamins A, B-complex, C, D, E, KFolic acidZinc, iron, selenium, iodineCalcium & magnesium (low doses)
Safety & Cautions
⚠
At standard doses MVMs are safe for most adults; risk comes from high-dose formulas and stacking with other supplements (excess preformed vitamin A in pregnancy and for bone health, beta-carotene raising lung-cancer risk in smokers, and iron overdose, a leading cause of poisoning in young children). Vitamin K content can alter warfarin control, so keep intake consistent and tell the anticoagulation clinic. Calcium, iron, zinc and magnesium reduce absorption of levothyroxine, tetracycline and quinolone antibiotics and bisphosphonates, so separate doses by several hours. Biotin in some formulas can distort thyroid and troponin blood tests. Educational only — always check with your doctor or pharmacist before combining Multivitamins with any medicine.
Multivitamins is most often taken for Prevents or corrects dietary micronutrient shortfalls, Small reduction in total cancer in one long trial (PHS II), Modest slowing of memory decline in older adults (COSMOS), Standard care in pregnancy (prenatal), after bariatric surgery and in restrictive diets. Daily all-in-one pill: fills gaps, but won't prevent heart disease.
Does Multivitamins work — what does the evidence say?
Mixed evidence. Conflicting results across studies; benefit uncertain. Multivitamin–multimineral (MVM) supplements combine most essential vitamins and minerals at roughly daily-requirement doses and are the most widely used supplement. Their clear role is filling gaps: pregnancy (folic acid), bariatric surgery, restrictive diets and older adults who eat poorly. For preventing chronic disease, results are underwhelming. In the Physicians' Health Study II (14,641 men, about 11 years), a daily MVM cut total cancer by 8% (HR 0.92) but had no effect on heart attacks, strokes or cardiovascular death. A meta-analysis of 18 studies (about 2 million people) found no link with cardiovascular mortality, and a 2024 cohort of 390,000 adults found no survival benefit. The 2022 USPSTF review judged the evidence insufficient to recommend MVMs for preventing heart disease or cancer. More encouragingly, the COSMOS trials found older adults taking an MVM had slightly better memory over 2–3 years (equivalent to about 2 years less cognitive aging) and small shifts in epigenetic aging clocks, findings that still need independent replication.
What is the typical dose of Multivitamins?
One standard daily MVM supplying roughly 100% of recommended daily values (the dose used in PHS II and COSMOS); avoid 'mega-dose' formulas.
Is Multivitamins safe? Any cautions or side effects?
At standard doses MVMs are safe for most adults; risk comes from high-dose formulas and stacking with other supplements (excess preformed vitamin A in pregnancy and for bone health, beta-carotene raising lung-cancer risk in smokers, and iron overdose, a leading cause of poisoning in young children). Vitamin K content can alter warfarin control, so keep intake consistent and tell the anticoagulation clinic. Calcium, iron, zinc and magnesium reduce absorption of levothyroxine, tetracycline and quinolone antibiotics and bisphosphonates, so separate doses by several hours. Biotin in some formulas can distort thyroid and troponin blood tests.
How many studies support Multivitamins?
NutriDex cites 9 sources for Multivitamins, graded "Mixed".
Cite this page
APA
Peh, D. (2026). Multivitamins (Multivitamin–multimineral (MVM) supplements): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 18 Oct 2026, from https://nutridex.info/s/multivitamin
BibTeX
@misc{nutridex_multivitamin,
author = {Peh, Daryl},
title = {Multivitamins (Multivitamin–multimineral (MVM) supplements): Benefits, Dosage, Side Effects \& Evidence},
year = {2026},
howpublished = {NutriDex --- The Supplement Research Compendium},
url = {https://nutridex.info/s/multivitamin},
note = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-10-18}
}
For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.