The most important supplements for a 70-year-old woman address bone strength, brain health, muscle maintenance, and the nutrient gaps that become harder to close through food alone with age. Not every woman needs the same stack, but a few core supplements have strong evidence behind them, and several others are worth considering based on your specific health concerns.
Calcium and Vitamin D for Bone Strength
Women over 70 need 1,200 mg of calcium and 800 IU of vitamin D daily. These two work together: calcium provides the raw material for bone, and vitamin D helps your body absorb it. Without enough vitamin D, you can take all the calcium you want and your bones won’t benefit much.
Most women don’t get 1,200 mg from food alone, especially if dairy intake has dropped. A supplement that provides 500 to 600 mg of calcium can fill the gap when combined with dietary sources like yogurt, fortified orange juice, or leafy greens. Splitting calcium into two smaller doses (morning and evening) improves absorption compared to taking it all at once. Many doctors recommend vitamin D levels higher than 800 IU, particularly if a blood test shows you’re deficient, which is common in older adults who spend less time in the sun.
Vitamin B12 for Brain and Nerve Function
B12 deficiency is one of the most common and most overlooked nutrient shortfalls in older adults. The reason isn’t usually diet. Between 60 and 70 percent of B12 deficiency cases in seniors are caused by changes in the stomach lining that reduce your ability to extract B12 from food. A condition called atrophic gastritis, which becomes increasingly common with age, lowers stomach acid production and makes it harder to absorb the B12 bound to proteins in meat, eggs, and dairy.
Supplemental B12 bypasses this problem because it’s already in a free form your body can use. The recommended intake for adults is 2.4 micrograms per day, but many clinicians suggest higher doses (500 to 1,000 mcg) for seniors with absorption issues. Low B12 can cause fatigue, memory problems, tingling in the hands and feet, and balance difficulties. These symptoms are sometimes mistaken for normal aging, so a simple blood test is worth requesting if you haven’t had one recently.
Protein to Protect Muscle Mass
Muscle loss accelerates after 70, and it takes more protein to maintain what you have than it did when you were younger. Current recommendations for older adults call for 1.0 to 1.2 grams of protein per kilogram of body weight daily. For a 140-pound woman, that’s roughly 64 to 76 grams per day. If you have a chronic condition like heart failure or are already experiencing noticeable muscle weakness, the target rises to 1.2 to 1.5 grams per kilogram.
Older adults also need more protein per meal to trigger muscle repair: about 0.40 grams per kilogram at each sitting, compared to 0.24 for younger adults. That means spreading protein across three meals matters more than loading it into dinner. If you struggle to eat enough through whole foods, a protein powder mixed into a smoothie or oatmeal can help you hit your numbers without feeling overly full. Whey protein is well-studied for muscle maintenance, but plant-based blends work too.
Omega-3 Fatty Acids for Heart and Brain
Fish oil supplements provide EPA and DHA, two fatty acids that support cardiovascular health and may help maintain cognitive function. For general heart health, a combined dose of around 500 to 700 mg of EPA and DHA daily is a reasonable starting point. The American Heart Association recommends about 1 gram per day for people with existing coronary heart disease.
The evidence for cognitive benefits is more mixed. A trial of adults aged 70 to 79 who took 700 mg of combined EPA and DHA daily for two years did not find significant cognitive improvement. That said, omega-3s have well-established benefits for reducing inflammation and supporting heart rhythm. If you eat fatty fish like salmon or sardines twice a week, you may already be getting enough. If not, a supplement is a reasonable addition. The FDA advises keeping supplemental EPA and DHA below 2 grams per day.
Magnesium for Sleep, Muscles, and Digestion
Many older women fall short on magnesium, which plays a role in sleep quality, muscle cramps, blood sugar regulation, and bone health. The form you choose matters. Magnesium citrate has a mild laxative effect, making it a good pick if constipation is a recurring issue. Magnesium glycinate is gentler on the stomach and less likely to cause diarrhea, so it’s a better choice if your digestion is already regular or if you’re mainly looking for help with sleep and muscle cramps.
A daily dose of 200 to 400 mg of supplemental magnesium is typical. Because magnesium competes with calcium for absorption, taking them at different times of day can improve how well your body uses each one.
A Daily Multivitamin as a Safety Net
A standard daily multivitamin won’t replace targeted supplements, but it can fill small gaps in nutrients you’re not tracking individually. The COSMOS trial, a large randomized study, found that older adults who took a daily multivitamin for two years experienced a slowing of cognitive aging equivalent to about two years. The strongest benefit appeared in episodic memory, the type of memory involved in recalling events and conversations. The effect was modest but statistically clear across multiple substudies within the trial.
A multivitamin is most useful as a baseline, not a substitute for the higher-dose supplements listed above. Most multivitamins contain only small amounts of calcium, vitamin D, and magnesium, well below what a 70-year-old woman typically needs.
CoQ10 if You Take a Statin
Statin medications, commonly prescribed to lower cholesterol, can reduce your body’s natural production of CoQ10, a compound your cells use to generate energy. This depletion is one reason statins sometimes cause muscle pain and fatigue, and these side effects are more common in women and older adults. If you take a statin and notice muscle soreness or unusual tiredness, CoQ10 supplementation may help. Clinical trials in heart-related conditions have used daily doses of 100 to 400 mg. The form called ubiquinol in a water-soluble softgel is absorbed more efficiently than the standard ubiquinone form.
Supplements for Specific Conditions
Joint Pain
Glucosamine sulfate at 1,500 mg per day has been shown to reduce knee pain from osteoarthritis more effectively than a placebo, and its side effect profile is similar to a sugar pill. The benefit is real but modest: global pain scores improve, while broader measures of stiffness and physical function show less convincing gains. Short-term use (a few months) seems to deliver the most noticeable relief, while long-term studies have been less impressive. It’s reasonable to try for 8 to 12 weeks and see if you notice a difference.
Eye Health
If you’ve been diagnosed with intermediate or advanced age-related macular degeneration, the AREDS 2 formula is one of the few supplements proven to slow progression. It contains vitamin C (500 mg), vitamin E (400 IU), zinc (80 mg), copper (2 mg), lutein (10 mg), and zeaxanthin (2 mg). This is a specific formulation for a specific condition. It won’t prevent macular degeneration from developing in the first place, but for women who already have it, the evidence is strong enough that the National Eye Institute recommends it.
Watch for Interactions With Medications
The more supplements and medications you take, the higher the risk that something interacts. A few combinations are especially important to know about. Vitamin E, fish oil, and ginkgo biloba all thin the blood. If you take a blood thinner like warfarin, adding any of these without your doctor’s awareness can increase the risk of internal bleeding. Calcium supplements can interfere with the absorption of thyroid medication and certain antibiotics, so spacing them apart by at least two hours is important.
St. John’s wort, sometimes taken for mild depression, reduces the effectiveness of a wide range of medications including heart drugs, antidepressants, and immunosuppressants. High-dose zinc (like the amount in the AREDS 2 formula) can block copper absorption, which is why that formula includes copper to compensate. Keeping a written list of every supplement and medication you take, and bringing it to medical appointments, is one of the simplest things you can do to stay safe.