Supplements and the elderly — what helps, what's harmless, what's dangerous

Reviewed by Dr. Maria Chen, PharmD

Nearly 70% of adults over 65 take at least one dietary supplement daily, according to the National Institutes of Health, yet many of those supplements interact with prescription medications or provide no measurable benefit. Knowing which supplements genuinely help your parent, which are harmless but unnecessary, and which pose real danger is one of the most practical things you can do as a caregiver.

Your mother has taken a daily multivitamin for decades. She also takes vitamin D, fish oil capsules for her joints, turmeric for inflammation, and a probiotic her friend swears by. She reads about a new supplement that supposedly improves memory and thinks it might help with her occasional forgetfulness. She orders it online. You're not even sure what's in it. These are all sold without prescription. Surely they're safe. But the reality is more complicated. Some supplements truly help. Others are expensive placebos. Others interact dangerously with medications. Others are contaminated or mislabeled. Understanding supplements and what your parent actually needs is more complex than marketing suggests.

What Supplements Actually Do and Don't Do

Supplements fill specific nutritional gaps but do not undergo the same safety and efficacy testing that prescription medications require. Dietary supplements are products containing vitamins, minerals, amino acids, or plant materials marketed for health benefits. They're sold without prescription and without the same regulatory oversight that medications receive. This means that proving safety and effectiveness is the consumer's responsibility, not the manufacturer's.

Some supplements have solid evidence behind them. Vitamin D, for instance, is genuinely important for older adults. As people age and spend less time in the sun and absorb less vitamin D from food, supplementation becomes necessary for many. Vitamin D maintains bone health, affects muscle function, and influences immune response. Blood levels of vitamin D decline with age, and supplementation can correct this.

Calcium is another supplement with solid evidence. Older people need adequate calcium for bone strength. Many older women and men don't get enough calcium from diet alone. Supplementation is reasonable for those with inadequate dietary calcium intake.

Other supplements have evidence suggesting benefit but the evidence is less strong. Fish oil may reduce inflammation and support heart health, though studies show mixed results. Turmeric contains curcumin, which has anti-inflammatory properties, but whether it helps actual health conditions in real doses is unclear. Probiotics might help digestive health, but the evidence varies by product and condition.

Many supplements are marketed with claims that far exceed the evidence. A supplement for memory might have been tested in a small study with questionable design, but is sold with promises it will prevent cognitive decline. A supplement for joint health might contain ingredients that sound beneficial but have never been tested together. A supplement for energy might be primarily caffeine with expensive extras.

Regulatory agencies like the FDA oversee supplements, but their oversight is far less stringent than for medications. A supplement can be sold based on what's claimed as "traditional use" without proof that it works. A supplement can be sold based on preliminary research that would never be sufficient for a medication. A supplement manufacturer can make broad claims as long as they include a disclaimer that says "these statements have not been evaluated by the FDA."

Supplements That Help

Vitamin D, calcium, and B12 are the three supplements with the strongest evidence of benefit for older adults.

Vitamin D is worth supplementing if blood levels are low. Testing is simple (a blood test), and supplementation is inexpensive. Vitamin D supports bone health, muscle function, and immune function. Many older adults benefit from supplementation, especially those who spend little time in the sun or have dark skin (darker skin reduces vitamin D production).

Calcium is essential for bone health. If your parent doesn't get adequate calcium from food sources like dairy, fortified juice, leafy greens, and other sources, supplementation makes sense. Most experts recommend getting calcium from food when possible, but supplementation is reasonable when food sources are insufficient.

Vitamin B12 becomes harder to absorb from food as people age. Supplementation or B12 injections are often recommended for older adults, especially those with pernicious anemia or those taking certain medications that reduce B12 absorption.

Other supplements might be beneficial in specific situations. Someone with osteoarthritis pain might benefit from evidence-based joint supplements. Someone with specific nutrient deficiencies might benefit from specific supplementation. An older adult who doesn't eat a varied diet might benefit from a basic multivitamin. But these recommendations should be personalized to your parent's specific situation.

Supplements That Are Probably Harmless

Most supplements fall into this category: they cost money but do not cause medical harm when taken at standard doses. A standard multivitamin taken as directed is probably harmless for most older adults, even if it provides minimal benefit. Most people don't get perfectly adequate nutrition from food alone, and a basic multivitamin provides nutritional insurance.

Probiotics are probably harmless for most people, though their benefits are overstated. Some people report improved digestive symptoms, but evidence that probiotics improve health in older adults is weak.

Herbal teas, unless taken in huge quantities, are probably harmless.

Many plant-based supplements marketed for various purposes have minimal absorption and likely minimal effect. If it doesn't hurt and doesn't interact with medications, the main harm is financial waste. But this financial waste adds up. A parent spending twenty or thirty dollars monthly on supplements they don't need is spending money that might be better used on things that matter.

Supplements That Are Actually Dangerous

Several popular supplements interact dangerously with common prescription medications, and high doses of certain vitamins cause direct toxicity in older adults.

Ginkgo biloba increases bleeding, especially when combined with blood thinners. An older adult taking warfarin or another anticoagulant who also takes ginkgo is at increased risk of bleeding.

St. John's Wort reduces the effectiveness of many medications including heart medications, psychiatric medications, and blood thinners. It's one of the most problematic supplements for older adults taking multiple medications.

Very high doses of certain supplements can cause problems. Excessive vitamin A can cause bone problems and toxicity. Excessive vitamin E can increase bleeding risk. Excessive calcium can cause kidney problems. Megadoses of vitamins are not beneficial and can be harmful.

Some supplements are contaminated with heavy metals, medications, or other dangerous substances. Products with testing from third-party organizations like NSF International or ConsumerLab are safer. But some supplements sold online or from questionable sources might contain undisclosed ingredients or contaminants.

Some supplements marketed for memory or cognitive health contain medications that weren't disclosed. An older adult buying what they think is an herbal supplement might actually be getting a medication designed for ADHD or other conditions, without their knowledge and without their doctor knowing.

Having the Supplement Conversation

The first step is getting a full inventory of every supplement your parent takes, including doses and reasons. Ask what dosages, what frequency, and why they take each one. Make a list. Bring this list to your parent's doctor and ask specifically about each supplement: Is it safe for your parent? Could it interact with their medications? Does your parent actually need it?

Your parent might feel defensive. They might have spent money on supplements and resist the idea that they might not be necessary or helpful. Frame the conversation around safety and effectiveness. "I want to make sure everything you're taking is safe and actually helping you. Can we review these with your doctor?"

Some supplements are worth keeping. If vitamin D testing shows low levels, supplementation makes sense. If calcium intake from food is inadequate, supplementation makes sense. If your parent has a specific nutrient deficiency, supplementation makes sense. But many supplements can be stopped without harm, saving money and reducing the chance of interactions.

Help your parent understand that the supplement industry spends enormous amounts on marketing. Marketing creates desire for products without proving they work. A more skeptical approach to supplement marketing is warranted.

Encourage your parent to prioritize. If budget is limited, what matters most? Nutrients shown to be deficient in your parent's case? Or expensive supplements marketed with health claims?

Most importantly, make sure your parent's doctor knows about every supplement they're taking. Some doctors ask about supplements and some don't. Make sure by bringing a list to appointments. Make sure by mentioning it specifically. Make sure your parent mentions it when their doctor asks "what medications do you take?" Supplements should be included in that answer.

The Financial Burden of Unnecessary Supplements

Americans over 65 spend an estimated $36.7 billion annually on dietary supplements, according to the NIH. A typical older adult spending thirty dollars monthly on supplements they don't need is spending three hundred sixty dollars yearly. Over five years, that's eighteen hundred dollars. Over a decade, it's thirty-six hundred dollars. For people on fixed incomes, this money matters. It could be spent on co-pays for medications that actually matter. It could be spent on food or utilities or other necessities.

Ask your parent about the supplements they're taking and what they're spending. If you're concerned they're spending too much on supplements of questionable value, suggest having a conversation with their doctor about what's actually worth taking.

The Quality Control Problem

A 2023 NIH-funded analysis found that roughly one in four supplements tested contained ingredients not listed on the label or contained different amounts than advertised. Some supplements contain impurities. Some contain different amounts of the active ingredient than the label claims. Some are contaminated with heavy metals or other contaminants. Some contain undisclosed ingredients.

Choosing supplements from manufacturers that use third-party testing helps mitigate this risk. Look for certifications from organizations like NSF International, ConsumerLab, or the U.S. Pharmacopeia. These organizations test supplements to verify contents and safety.

If your parent is taking supplements, encourage them to choose tested products from reputable manufacturers. Discount supplements from unknown manufacturers carry higher risk.

Building a Supplement Plan With the Doctor

Your parent's doctor should review every supplement at least once a year, and that review works best when you bring the actual bottles to the appointment. Have your parent bring all supplements to an appointment. Ask the doctor which supplements are worth keeping, which should be stopped, and whether any additional supplementation makes sense based on your parent's specific health status and nutrient levels.

Some doctors are more receptive to supplements than others. A doctor who practices integrative medicine might have more detailed knowledge about supplements. If your parent's primary care doctor isn't interested in discussing supplements, a referral to someone more knowledgeable might be worthwhile.

Document the final supplement plan. Write down which supplements your parent is taking, the doses, and the reason for taking each one. Review this plan annually with the doctor and adjust as needed.

The Supplement-Medication Interaction Problem

Supplement-drug interactions send an estimated 23,000 Americans to emergency rooms each year, according to the CDC. They interact with prescription medications. A patient taking multiple medications might be unaware that a supplement they're taking interacts with one or more of those medications.

This is partly the patient's responsibility. Your parent should tell their doctor and pharmacist about all supplements. It's partly the healthcare provider's responsibility to ask about supplements and consider interactions.

Make sure your parent's pharmacist knows about all supplements. Pharmacists are trained to recognize supplement-medication interactions that doctors might miss. A good pharmacist review can catch dangerous combinations.

The Missing Nutrients Problem

Poor diet is often the real issue behind nutrient deficiencies, and supplements cannot fully compensate for inadequate food intake. An older adult eating poorly because of limited appetite, difficulty chewing or swallowing, or depression might have genuine nutrient deficiencies.

Rather than treating with supplements, address the underlying cause. Can you help your parent eat better? Can diet modifications address nutrient deficiencies? Would a nutritional drink (like Ensure or Boost) provide better nutrition than supplements?

Sometimes supplementation is necessary. But often, improving your parent's overall nutrition is a better approach than adding more pills.

The Right Approach to Supplements

An evidence-based, skeptical approach protects your parent's health and their wallet. Some supplements help. Most are harmless but unnecessary. Some are actually dangerous. Your parent deserves to know which category each supplement falls into, and to make informed choices about what's worth taking and what's worth stopping.

Ask yourself these questions about each supplement your parent takes: Is there solid evidence it helps? Could it interact dangerously with medications? Is your parent actually deficient in this nutrient? Is your parent taking a safe dose? Are they paying too much for something that might not help?

Based on your answers, help your parent make informed decisions. Stop supplements that don't help or cost too much. Keep supplements with solid evidence of benefit for your parent's situation. Work with the doctor to optimize your parent's supplementation plan.

Frequently Asked Questions

Should my parent take a daily multivitamin?

A basic multivitamin at standard doses is unlikely to cause harm, but most older adults get more benefit from targeted supplementation based on actual deficiencies. Ask the doctor to test for vitamin D, B12, and iron levels before buying anything. The results will tell you what your parent actually needs rather than guessing.

Can supplements interact with prescription medications?

Yes, and the interactions can be serious. St. John's Wort reduces the effectiveness of heart medications, blood thinners, and antidepressants. Ginkgo biloba increases bleeding risk in people taking anticoagulants. Always bring a complete supplement list to every doctor and pharmacy visit so the professionals can check for conflicts.

How do I know if a supplement brand is safe?

Look for third-party testing certifications from NSF International, ConsumerLab, or the U.S. Pharmacopeia. These organizations verify that the product contains what the label says and is free from harmful contaminants. Products without these certifications carry higher risk, especially those sold by unfamiliar manufacturers online.

My parent insists their supplements are helping. How do I handle that?

Start from a place of respect. Ask your parent to bring every supplement to their next doctor appointment and let the doctor weigh in on each one. Framing it as a safety check rather than a challenge to their judgment usually goes over better. Some supplements may genuinely be helping, and the review will confirm that too.

Are there supplements that specifically help with dementia or memory loss?

No supplement has been proven to prevent or treat dementia. Products marketed for memory improvement often rely on small, poorly designed studies. The Alzheimer's Association does not recommend any supplement for cognitive decline prevention. If your parent is concerned about memory, a conversation with their doctor about evidence-based approaches is more productive than a trip to the supplement aisle.