Women over 50 and men over 70 need 1,200 mg of calcium a day; men 51 to 70 need 1,000 mg. The safe upper limit for adults over 50 is 2,000 mg a day from food and supplements combined (NIH Office of Dietary Supplements). You also need vitamin D to absorb calcium: 600 IU a day up to age 70 and 800 IU after 70.
Food is the best place to get it. Supplements fill gaps, but more isn’t better, and taking too much raises the risk of kidney stones and constipation.
How much calcium seniors need
| Group | Calcium per day | Upper limit |
|---|---|---|
| Women 51+ | 1,200 mg | 2,000 mg |
| Men 51-70 | 1,000 mg | 2,000 mg |
| Men 71+ | 1,200 mg | 2,000 mg |
Best food sources
These figures come from the NIH calcium fact sheet:
| Food | Calcium |
|---|---|
| Plain low-fat yogurt, 8 oz | 415 mg |
| Calcium-fortified orange juice, 1 cup | 349 mg |
| Part-skim mozzarella, 1.5 oz | 333 mg |
| Canned sardines with bones, 3 oz | 325 mg |
| Nonfat milk or fortified soy milk, 1 cup | 299 mg |
| Firm tofu made with calcium sulfate, ½ cup | 253 mg |
| Canned pink salmon with bones, 3 oz | 181 mg |
| Cottage cheese (1%), 1 cup | 138 mg |
| Cooked kale, 1 cup | 94 mg |
Spinach contains calcium, but the body absorbs little of it because of oxalate. Kale, bok choy and broccoli are better green sources.
A day that reaches 1,200 mg: yogurt at breakfast (415), a glass of milk at lunch (299), sardines or salmon on crackers as a snack (325), and cooked kale with dinner (94), plus small amounts from bread and other foods.
If you take a supplement
- Take 500 mg or less at a time. The body absorbs the highest share of calcium from doses of 500 mg or less.
- Calcium carbonate is cheaper and should be taken with food. Calcium citrate can be taken with or without food and may be better if you take acid-reducing medicines.
- Count your food first. Many people need only a small supplement, or none.
- Watch for side effects such as gas, bloating and constipation.
- Check interactions. Calcium can reduce absorption of some antibiotics, thyroid medicine and osteoporosis drugs like alendronate. Space them apart as your pharmacist advises.
Calcium, bones and fractures
Calcium and vitamin D are part of bone health, but supplements alone don’t prevent most fractures. If you have osteoporosis, your doctor may recommend medicine, and weight-bearing and strength exercise also help. See my guides to osteoporosis medicines and exercises for osteoporosis. Magnesium also plays a role; my magnesium guide covers how much you need.
Who should be careful
- Kidney stones or kidney disease: ask your doctor before taking supplements.
- Heart disease: some studies have raised questions about calcium supplements and heart risk; getting calcium from food is the safer default.
- Taking several products: antacids like Tums contain calcium carbonate. Count them toward your total.
For a full eating plan, see my senior nutrition guide.
How to count your calcium in one minute
Most people don’t need a supplement once they count their food. Try this:
- Write down a normal day’s food.
- Give each item its number from the table above. For packaged foods, read the label: the % Daily Value for calcium times 13 gives milligrams. (For example, 20% DV = about 260 mg.)
- Add about 200 to 300 mg for the small amounts in bread, eggs and other foods.
- Compare the total to your target (1,000 or 1,200 mg).
If you are short by 300 mg, add a glass of milk or a yogurt. Only use a supplement for the gap you can’t fill with food.
Supplement labels: the tricky part
Calcium labels can confuse people. Look at elemental calcium, the amount your body can actually use.
| Type | Elemental calcium | Take with food? | Notes |
|---|---|---|---|
| Calcium carbonate | 40% | Yes | Cheaper. Can cause gas and constipation |
| Calcium citrate | 21% | Not needed | Better if you take acid-reducing medicine |
Example: a 1,250 mg calcium carbonate tablet gives about 500 mg of elemental calcium. A 1,000 mg calcium citrate tablet gives about 210 mg. Read the “Supplement Facts” box, which lists the elemental amount per serving.
Vitamin D: the partner nutrient
Your body needs vitamin D to absorb calcium. The daily target is 600 IU up to age 70 and 800 IU after 70. Sources include fortified milk, salmon, eggs and sunlight. Many older adults get too little, especially those who spend most time indoors. Ask your doctor whether you need a blood test before taking a vitamin D supplement. More is not always better. Very high doses can cause harm.
Medicine timing: what experienced pharmacists tell people
- Thyroid medicine (levothyroxine): take it at least 4 hours apart from calcium.
- Alendronate and similar bone medicines: take them first thing in the morning with plain water, then wait at least 30 minutes (or as your label says) before calcium or food.
- Some antibiotics (like ciprofloxacin and doxycycline): space them several hours from calcium.
- Iron: calcium can block it. Take them at different meals.
Your pharmacist can make a simple schedule. Bring all your pills and supplements in a bag.
Gotchas
- Double counting. Many multivitamins and antacids contain calcium. Count them.
- “Bone health” blends. Some combine calcium with high doses of vitamin D or other minerals. Check the totals.
- Dairy-free diets. Choose soy milk or orange juice with added calcium, and shake the carton, since the calcium settles at the bottom.
- Spinach myth. Spinach is healthy, but you absorb very little of its calcium.
- Kidney stones. Getting enough calcium from food may actually help prevent the most common kind of stone. It is supplements taken in big doses that raise risk. Ask your doctor.
Common questions
How much calcium should a 70-year-old woman take?
Women over 50 need 1,200 mg a day from food and supplements combined. The upper limit is 2,000 mg.
Is it better to get calcium from food or supplements?
Food is preferred. Supplements can fill a gap, ideally 500 mg or less at a time.
Can seniors take too much calcium?
Yes. Over 2,000 mg a day can raise the risk of kidney stones and constipation, and it may interact with medicines.
What is the best calcium supplement for seniors?
Calcium citrate is absorbed with or without food and suits people on acid-reducing medicines. Calcium carbonate is fine with meals and costs less.
How do I know how much calcium is in my supplement?
Look at the Supplement Facts box for the elemental calcium per serving. Calcium carbonate is about 40% calcium; calcium citrate is about 21%.
Can I take calcium with my thyroid pill?
Not at the same time. Space calcium at least 4 hours from levothyroxine, or as your pharmacist advises.
Written by Khasim Basha Shaik. I research senior health and nutrition and summarize official sources for readers. I’m not a doctor, dietitian or other licensed health professional. Talk with your doctor before starting supplements. Last reviewed October 14, 2026.
