Turning 50 doesn't flip a switch, but your body does start handling some nutrients differently. A few needs go up, one goes down, and the research on multivitamins in older adults is more interesting than you might expect.
Written by Vita Globe Editorial Team | Reviewed against NIH Office of Dietary Supplements guidance and the COSMOS trials
Should you take a multivitamin after 50?
It can be a sensible backup. Adults over 50 are advised to get vitamin B12 mainly from fortified foods or supplements because absorption from food declines[1]. Vitamin D needs rise to 800 IU after 70[2], calcium needs rise for women[3], and iron needs fall to 8 mg for women[4]. In COSMOS, a daily multivitamin was linked with better memory and cognition scores in older adults[5].
Caveat: The same COSMOS trial found no reduction in cancer, cardiovascular disease or deaths[6], so a multivitamin is support, not prevention.
Sources: NIH ODS multivitamins · NIH ODS vitamin D · NIH ODS calcium · NIH ODS iron · Vyas 2024 · COSMOS 2022 · Verified 2026-09-27
In this article
Why does vitamin B12 matter more after 50?
Vitamin B12 in food is bound to protein, and your stomach needs acid and a protein called intrinsic factor to release and absorb it. Atrophic gastritis, which reduces both, affects about 8% to 9% of adults 65 and older[7].
That's why adults over 50 are advised to get most of their B12 from fortified foods or supplements, where it isn't bound to protein and is easier to absorb[1]. Some common medications also affect B12. Metformin and proton pump inhibitors (acid reducers) can both lower B12 absorption[7], so if you take either, it's worth asking your doctor about checking your levels.
What happens to vitamin D and calcium needs?
Vitamin D. The skin's ability to make vitamin D from sunlight declines with age, and older adults may also spend more time indoors[2]. The RDA is 15 mcg (600 IU) a day through age 70, then 20 mcg (800 IU) after that[2]. More on this in vitamin D deficiency.
Calcium. Women need 1,200 mg a day from 51 onward, and men from 71 onward; men 51 to 70 need 1,000 mg[3]. A multivitamin won't cover that. Food is the main source, and if you need a supplement, absorption is best in doses of 500 mg or less at a time[3].
Why do iron needs go down?
For women, the iron RDA drops from 18 mg to 8 mg after 50, the same as for men[4]. With menstruation ending, most people get enough from food. Multivitamins aimed at seniors often contain little or no iron[4]. Unless your doctor has found low iron, a formula without it is usually fine.
Can a multivitamin help memory as you age?
This is one of the more encouraging areas of multivitamin research. COSMOS tested a daily multivitamin in 21,442 US adults (women 65 and older, men 60 and older)[6]. Within that trial, researchers ran three separate cognition studies. In the clinic-based study of 573 participants, the multivitamin group had a more favorable two-year change in episodic memory. When all three studies were pooled, a daily multivitamin benefited both global cognition and episodic memory[5].
A few honest caveats. The effect was modest, the trials tested one specific multivitamin, and they measured test scores rather than dementia diagnoses. It's a reasonable reason for an older adult to consider a multivitamin, not a promise of protection.
The honest summary
- After 50, prioritize vitamin B12 from supplements or fortified foods.
- Vitamin D needs rise after 70; calcium needs rise for women after 50.
- Most people over 50 don't need iron in a multivitamin.
- COSMOS suggests a modest cognitive benefit, but no protection against cancer or heart disease.
Choosing by sex? See multivitamins for women and multivitamins for men.
Our option
Vita Globe Adult Complete Multivitamin Gummies – Pouch
Each two-gummy serving provides vitamins A, C (60 mg), D (10 mcg), E, B6, folate, B12, biotin and pantothenic acid, plus zinc and iodine. The gummies are vegan, gluten-free and non-GMO, made without artificial colors or flavors, and come in resealable 14-count pouches, which is a week of servings at 2 gummies a day. It includes B12 and doesn't include iron. The 10 mcg of vitamin D covers part of the 15 to 20 mcg RDA, so food and sunlight still matter.
Frequently asked questions
What vitamins should a 50-year-old take?
Many people over 50 benefit most from B12 in supplement or fortified-food form[1], plus enough vitamin D and calcium. Your doctor can tell you whether you need anything else based on your diet and bloodwork.
Do seniors need a different multivitamin?
Senior formulas often contain less or no iron[4]. The main things to check are B12, vitamin D and the absence of megadoses.
Does a multivitamin prevent memory loss?
COSMOS found better memory and cognition scores with a daily multivitamin in older adults[5], but it didn't test whether it prevents dementia.
Can metformin affect my vitamin levels?
Yes. Metformin can reduce B12 absorption and blood levels[7]. Ask your doctor whether testing makes sense for you.
Sources
- Office of Dietary Supplements, National Institutes of Health. Multivitamin/mineral Supplements: Fact Sheet for Health Professionals. Updated July 17, 2024. ods.od.nih.gov
- Office of Dietary Supplements, National Institutes of Health. Vitamin D: Fact Sheet for Health Professionals. Accessed September 27, 2026. ods.od.nih.gov
- Office of Dietary Supplements, National Institutes of Health. Calcium: Fact Sheet for Health Professionals. Accessed September 27, 2026. ods.od.nih.gov
- Office of Dietary Supplements, National Institutes of Health. Iron: Fact Sheet for Health Professionals. Accessed September 27, 2026. ods.od.nih.gov
- Vyas CM, Manson JE, Sesso HD, et al. Effect of multivitamin-mineral supplementation versus placebo on cognitive function: results from the clinic subcohort of the COSMOS randomized clinical trial and meta-analysis of 3 cognitive studies within COSMOS. Am J Clin Nutr. 2024;119(3):692-701. doi:10.1016/j.ajcnut.2023.12.011
- Sesso HD, Rist PM, Aragaki AK, et al. Multivitamins in the prevention of cancer and cardiovascular disease: the COcoa Supplement and Multivitamin Outcomes Study (COSMOS) randomized clinical trial. Am J Clin Nutr. 2022;115(6):1501-1510. doi:10.1093/ajcn/nqac056
- Office of Dietary Supplements, National Institutes of Health. Vitamin B12: Fact Sheet for Health Professionals. Accessed September 27, 2026. ods.od.nih.gov
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
