Nutrient status can change with diet, absorption, medicines and health. There is no fixed set of vitamins that inevitably becomes deficient in every older adult. Age is one part of the assessment, rather than a diagnosis.
Review intake and absorption separately
Eating less of a nutrient and absorbing less of it are different problems. Dietary restrictions, appetite changes, gastrointestinal conditions and medicines can matter. The NIH guides for B12 and vitamin D explain why particular circumstances deserve attention.
Do not diagnose a gap from a symptom list
Fatigue, changes in concentration or muscle discomfort can have many causes. A product page cannot tell you which nutrient, if any, is involved. Ask whether a dietary review, testing or another assessment is appropriate before starting treatment for a presumed deficiency.
Compare amounts across products
Check a multivitamin, single-nutrient products and fortified foods together. More intake is not always better. For magnesium, the Supplement Facts amount refers to elemental magnesium, which differs from the weight of magnesium glycinate compound listed elsewhere on a label.
NAD+ and CoQ10 are different questions
These compounds should not be inserted into a vitamin-deficiency checklist. Interest in NAD+ precursors does not make NMN a required way to “cover” aging. For CoQ10, a medication-associated change in blood levels is not itself proof that supplementation improves symptoms. Review the NCCIH evidence and interaction information.
A practical review before shopping
- List food sources and dietary restrictions.
- Record current supplements and serving amounts.
- Review relevant medicines and health conditions.
- Identify a specific reason for a new product.
- Reassess after a change in health or medication.
Our Daily Essentials collection provides labels to compare once you have identified the question you need to address.
Sources and further reading
- NIH ODS: multivitamin and mineral supplements
- NIH ODS: vitamin B12
- NIH ODS: vitamin D
- NIH ODS: magnesium
- NCCIH: CoQ10, evidence and interactions
Statements about dietary supplements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare professional before starting a supplement if you take medication or have a medical condition.