Which Supplements Matter at Age 75? A Science-First Guide

The short answer

Turning 75 does not automatically mean you need a daily handful of pills. The best supplement depends on:

• what you eat,
• your medical conditions,
• the medicines you take, and
• whether you actually have a nutrient gap.

At this age, preventing harm can be just as important as preventing deficiency. Here is what the research supports.

1. Vitamin B12: worth checking, especially if intake or absorption is low

Vitamin B12 helps make healthy blood and supports nerve function. With age, lower stomach-acid levels can make it harder to release and absorb the B12 naturally bound to food. People over 50 are advised to get much of their B12 from fortified foods or supplements, which may be easier to absorb (NIH ODS).

• The adult recommended intake is 2.4 micrograms (mcg) daily from all sources — a target, not a universal supplement prescription.
• A clinician may check your level if you have unexplained anemia, numbness, balance trouble, memory concerns, little animal-food intake, or risk factors such as metformin or long-term acid-suppressing medicines.
• A confirmed deficiency may need specific treatment.
• Taking extra B12 when levels are normal has not been shown to give everyone more energy or to prevent dementia.

Verdict: Consider it for a documented risk or gap; don't assume a megadose is better.

2. Vitamin D: meet the requirement, but don't mistake that for fracture prevention

The recommended vitamin D intake at age 71 and older is 20 mcg (800 IU) per day, counting food, fortified products and supplements (NIH ODS). Some older adults don't get enough through diet or sunlight, and a supplement may help meet the recommended intake or treat a clinician-identified deficiency.

But large trials and reviews do not support the sweeping claim that routine vitamin D pills — with or without calcium — reliably prevent falls or fractures in generally healthy older people living independently. The U.S. Preventive Services Task Force reached this position in a December 2024 draft recommendation (a draft, not a final guideline) (USPSTF draft; see also The BMJ).

This does not apply the same way to someone with a known deficiency, osteoporosis, relevant malabsorption or other special medical circumstances.

Verdict: Adequate intake matters; automatic high-dose pills are not proven fracture insurance.

3. Calcium: food first, supplement only the shortfall

People 71 and older need about 1,200 mg of calcium a day from all sources combined (NIH ODS). Good food sources include:

• dairy foods,
• calcium-fortified plant drinks,
• calcium-set tofu, and
• canned fish with edible bones.

If your diet falls short, ask whether a small supplement could fill the gap. More is not automatically better:

• Excess supplementation can cause constipation.
• Calcium supplements may increase kidney-stone risk in some people.
• Calcium can interfere with absorption of certain medicines, including thyroid hormone and some antibiotics — timing matters.

Verdict: Count your food calcium before buying a bottle.

4. Protein drinks or powders: helpful when meals fall short

Muscle strength supports walking, getting out of a chair, and staying independent. Older adults who eat too little may benefit from convenient protein-rich drinks or powders, particularly when paired with safe strength exercises.

• Expert groups often suggest roughly 1.0–1.2 g of protein per kilogram of body weight per day for relatively healthy older adults (PROT-AGE, PubMed; Geriatr Gerontol Int).
• That is not an individualized prescription and may be inappropriate for people with certain kidney conditions — medical or dietitian guidance matters.
• Eggs, fish, yogurt, beans, tofu and other foods all count.
• Powder is a convenience, not a superior nutrient or a substitute for exercise. More detail: Protein Powder After 50.

Verdict: Useful when real food doesn't meet an individualized protein goal.

5. Multivitamins: optional backup, not proven longevity pills

A basic, age-appropriate multivitamin can be reasonable if your diet is restricted or inconsistent, but it cannot replace food and its fiber (NIH ODS).

• Large observational research following nearly 400,000 U.S. adults did not find that routine multivitamin use lowered the risk of death (National Cancer Institute).
• Some trials suggest possible modest benefits on specific cognitive outcomes, but the evidence does not support promising prevention or treatment of Alzheimer's disease.
• Avoid stacking a multivitamin with several individual products that duplicate ingredients.
• Check the amounts of vitamin A, B6 and iron. Extra iron is not a routine need at 75 without an established reason.

More detail: Multivitamins After 50.

Verdict: A gap-filler, not an anti-aging requirement.

6. Fish oil: don't assume everyone needs it

Eating fish can be part of a heart-healthy eating pattern. But over-the-counter fish oil capsules are not a proven universal way to prevent a first heart attack, improve memory, or extend life (NIH ODS).

• Prescription omega-3 drugs used for specific high-triglyceride or cardiovascular-risk situations are a separate matter — don't confuse them with store-bought supplements.
• High-dose omega-3 (about 4 g/day in major trials) has been linked to a slightly higher risk of atrial fibrillation in some high-risk adults.
• Ask a clinician before using high doses or combining products with medicines that affect bleeding. See Do Herbal Supplements Thin Your Blood?

Verdict: Have a specific clinical reason, not an advertisement.

7. AREDS2 eye vitamins: a valuable exception for some eye diagnoses

The AREDS2 formula is not a general 75-plus multivitamin. It can help slow progression of certain stages of age-related macular degeneration (AMD) — especially intermediate AMD, or advanced AMD in one eye — and may also help in some late dry AMD situations (NCCIH; NIH IRP).

• Only an eye specialist can determine who benefits and which formula is right.
• It does not prevent every form of vision loss.

Verdict: Evidence-supported for selected AMD patients, not for everyone.

What to be especially cautious about at 75

• "Memory boosters," "anti-aging stacks," detoxes and high-dose antioxidant combinations usually run ahead of convincing evidence for major health outcomes.
• Magnesium pills are not risk-free, especially when kidney function is reduced. Large supplemental amounts can cause diarrhea or worse, and magnesium and calcium can interfere with certain antibiotics and bone medicines if taken too close together (NIH ODS).
• Herbs such as ginkgo and concentrated garlic may affect bleeding risk, and vitamin K-containing supplements can matter for people taking warfarin. "Natural" does not mean safe.
• Bring an up-to-date list or photos of all prescriptions, over-the-counter drugs and supplements to a pharmacist or clinician before adding a new product (National Institute on Aging). See also Supplements and Medications: The Interactions Adults Over 50 Should Know.
• Do not stop prescribed medicines to replace them with supplements.

The five-minute decision checklist

1. What specific problem or inadequate nutrient intake am I trying to address?
2. Could food, a review of my medicines, exercise, or a targeted medical treatment address it better?
3. What human evidence shows that this supplement helps people like me — not just a lab marker?
4. Could it interact with my medicines, or become unsafe with kidney or liver disease?
5. Does it carry a third-party quality mark such as USP or NSF — and do I understand that quality testing does not prove a supplement works?

Bottom line

At 75, the smartest supplement plan may be one targeted nutrient, no supplement at all, or a clinician-guided plan for a documented condition. Food quality, adequate protein, appropriately tailored physical activity and medication reviews usually matter more than a crowded pill organizer.

Choose a supplement because it solves a clearly identified problem — not because a label says "senior."