By Morgan Nwanguma
Dietary supplements are regularly promoted as easy solutions for better health, but for many older adults, the key question is not whether supplements are beneficial in general, it is whether there is an underlying nutritional deficiency that needs to be addressed. Vitamins such as B12 and D can be essential when levels are low, while adequate protein intake is one of the most important, yet often overlooked, factors in maintaining strength, mobility and independence. More is not always better, however, as some supplements can cause harm or interact with medications.
The use of dietary supplements has grown significantly in recent years. Vitamins, minerals and other nutritional products are frequently marketed as ways to boost energy, strengthen immunity, support brain function and even extend lifespan. For many people, taking supplements feels like a proactive step toward better health.
Yet this perception can be misleading. For individuals who already meet their nutritional needs through diet, many supplements provide little or no measurable benefit. Some may simply add unnecessary costs, while others can pose risks. High doses of certain vitamins and minerals can lead to toxicity, interfere with prescription medications or trigger unintended side effects.
For older adults, the issue is more nuanced. Rather than asking whether supplements are inherently “good” or “bad,” the more important questions are whether a deficiency exists, what may be causing it and whether supplementation is the safest and most effective solution.
Nutritional deficiencies become increasingly common with age. Appetite often declines, oral health problems may develop, chronic illnesses become more prevalent and many medications can affect how nutrients are absorbed, processed or eliminated by the body. Conditions such as tooth loss, gum disease and ill-fitting dentures can make chewing difficult and reduce dietary variety.
At the same time, older adults are often exposed to unhelpful messages about eating less, avoiding “heavy” meals or relying on soft foods. While these recommendations may seem sensible, they can conflict with the body’s ongoing need for adequate protein, vitamins and minerals. Over time, diets centred on small portions, soups, toast and tea may satisfy hunger without meeting nutritional requirements.
This does not mean that every older adult needs supplements. Instead, supplementation should be targeted and guided by confirmed deficiencies, known risk factors, medication use or evidence of inadequate dietary intake.
Vitamin B12 is a clear example. Deficiency becomes more common with age because the stomach often produces less acid, which is needed to release B12 from food. Low B12 levels can lead to anaemia, fatigue, nerve damage, numbness, tingling, memory problems and confusion. Certain medications, including metformin and proton pump inhibitors, can further increase the risk. High-dose oral supplements are effective for many people, although some may require injections.
Folate also plays an important role in red blood cell production and DNA synthesis. Low folate levels can increase homocysteine, a blood marker associated with cardiovascular disease and cognitive decline, although this does not prove that folate supplements prevent these conditions. Folate and other B vitamins may benefit selected individuals, including those with low folate or B12 levels, elevated homocysteine or mild cognitive impairment. However, vitamin B12 deficiency should always be ruled out before prescribing folate alone, as folate can mask certain signs of B12 deficiency while nerve damage continues to progress.
Vitamin D deficiency is another common concern among older adults. Risk factors include limited sun exposure, reduced mobility, darker skin, living in residential care settings and low intake of vitamin D-rich foods. Supplementation may be appropriate for individuals with confirmed deficiency, osteoporosis, recurrent falls or a high risk of fractures. However, more is not necessarily better. Research has shown that vitamin D supplementation does not significantly reduce fracture risk in generally healthy older adults who do not have a deficiency.
Calcium and magnesium are essential for bone, muscle and nerve health, but food sources should remain the primary option whenever possible. Supplements may be helpful when dietary intake is inadequate or osteoporosis is present, but excessive consumption should be avoided. Although magnesium is often promoted as a sleep aid, evidence supporting its routine use for insomnia remains limited.
Multivitamins may benefit older adults with poor appetite or limited dietary variety, but they should not be viewed as a universal safeguard against nutritional deficiencies. Large studies have found no clear association between daily multivitamin use and a lower risk of death. Ongoing research is exploring whether multivitamins influence markers of biological ageing, but it remains uncertain whether these effects translate into improved health, independence or longevity.
One of the most overlooked nutritional needs in later life is protein. Many older adults consume insufficient amounts or avoid protein-rich foods such as meat, fish, eggs, dairy products, beans and lentils. Inadequate protein intake can contribute to sarcopenia – the age-related loss of muscle mass and strength, which increases the risk of falls, frailty and loss of independence. Experts generally recommend a daily protein intake of approximately 1.0 to 1.2 grams per kilogram of body weight for healthy older adults. Higher amounts may be necessary during illness, recovery or periods of frailty, unless protein restriction has been advised because of kidney disease or another medical condition.
Excessive or unsupervised supplementation can be harmful. High doses of vitamins D and A may cause toxicity, while iron supplements should not be taken without confirmed deficiency unless recommended by a healthcare professional. Some supplements can interact with medications, and evidence suggests that high-dose antioxidant supplements, particularly beta-carotene and vitamin E, may increase mortality risk in certain groups.
A sensible approach to healthy ageing begins with food rather than pills. This means considering factors such as appetite, weight changes, chewing or swallowing difficulties, dietary variety, medical conditions, medication use and access to nutritious meals. Blood tests may be necessary to assess levels of key nutrients, including vitamin B12, folate, iron and vitamin D.
Current evidence does not support routine supplementation for all older adults. However, targeted use of vitamin D, vitamin B12, folate and, in some cases, multivitamin or protein supplements can provide meaningful benefits when deficiencies or inadequate intake are identified.
Supplements can support healthy ageing, but they are not shortcuts to good health. The foundations remain a balanced diet, regular strength-building exercise, sufficient sleep, social engagement and reliable access to nutritious food. The most effective supplement is one that addresses a genuine need, not the one with the boldest claims on its label.
Read Also How You Can Stay Healthy in Later Life.
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