Most women aged 19 to 50 need about 1,000 mg of calcium and 15 mcg (600 IU) of vitamin D a day, rising to 1,200 mg of calcium after 50, according to the US National Institutes of Health. Here is a surprise worth knowing: your body absorbs only about 5% of the calcium in spinach, compared with about 27% from milk. So the foods you choose matter as much as the number on the label.
Key takeaways
- Calcium targets for women 35–50 range from 700 mg (UK) to 1,000 mg (US, Australia) a day, depending on where you live. After 50 they rise to 1,200–1,300 mg in the US and Australia.
- Vitamin D helps you absorb calcium. The US advises 15 mcg (600 IU) a day; the NHS advises 10 mcg a day, at least in autumn and winter.
- Dairy, calcium-set tofu, fortified plant milks, canned fish with bones and low-oxalate greens such as kale are your best food sources.
- If you use a calcium supplement, take 500 mg or less at a time, and do not exceed 100 mcg (4,000 IU) of vitamin D a day without medical advice.
- Food plus strength and impact training does more for your bones than any pill on its own.
Why calcium and vitamin D matter after 35
Calcium is the main mineral in your bones and teeth. It also helps your muscles contract, your nerves send signals and your blood clot. When you do not eat enough, your body keeps blood calcium steady by drawing on your skeleton, quietly, for years.
Vitamin D is the partner nutrient. It helps your gut absorb calcium and keeps bones properly mineralised. Without enough vitamin D, even a good calcium intake does less for you.
Your mid-30s matter because most people have built their peak bone mass by then. From here, the goal is to hold on to what you have. Around menopause, falling oestrogen speeds up bone loss for a few years, which is one reason calcium targets rise after 50. If you have questions about perimenopause or menopause and your bones, talk to your doctor, who can look at your personal risk.
For the full picture on keeping your skeleton strong, including the best exercises, read our guide to bone health for women after 35.
How much calcium women need, by age and country
Official targets differ by country because expert panels read the same evidence in slightly different ways. None of them is wrong. Pick the one from your country, or use the US figure if you want a simple middle-of-the-road target.
| Country or body | Women 35–50 | Women 51–70 | Upper limit or caution |
|---|---|---|---|
| United States (NIH) | 1,000 mg | 1,200 mg | 2,500 mg to age 50; 2,000 mg after |
| Australia and New Zealand | 1,000 mg | 1,300 mg | 2,500 mg |
| European Union (EFSA) | 950 mg | 950 mg | Not covered here |
| United Kingdom (NHS) | 700 mg | 700 mg | 1,500 mg or less from supplements unlikely to harm |
Upper limits include food and supplements together. In practice, it is very hard to go over them with food alone. The risk comes from stacking high-dose tablets on top of an already calcium-rich diet.
How much vitamin D women need
Vitamin D advice is more consistent across countries, but the amounts still differ a little.
- United States (NIH): 15 mcg (600 IU) a day from 19 to 70, and 20 mcg (800 IU) after 70.
- United Kingdom (NHS): 10 mcg a day. Everyone should consider a 10 mcg supplement in autumn and winter. If you are rarely outdoors, usually cover most of your skin, or have dark skin, the NHS advises taking it all year.
- Upper limit: both the NIH and NHS put the adult maximum at 100 mcg (4,000 IU) a day.
One quick conversion helps when you read labels: 1 mcg of vitamin D equals 40 IU. So 10 mcg is 400 IU, and 25 mcg is 1,000 IU.
What about sunlight?
Your skin makes vitamin D from UVB light. The NHS says most people in the UK can make enough from about late March or early April to the end of September. Some researchers suggest roughly 5 to 30 minutes of midday sun on your face, arms and legs, a few times a week, is enough for many people, but it depends on your skin tone, latitude, season and age.
Two practical limits: UVB does not pass through glass, so sitting by a sunny window does not count, and sunscreen with SPF 8 or more blocks much of the vitamin D-producing light. Skin cancer risk is real, so do not skip sun protection to chase vitamin D. In winter, or if you live far from the equator, food and a supplement are the safer route.
The best calcium foods, including vegetarian options
The table below uses NIH food data. Serving sizes are converted to metric for convenience.
| Food | Serving | Calcium | Notes |
|---|---|---|---|
| Plain low-fat yogurt | 8 oz (227 g) | 415 mg | Vegetarian; Greek yogurt is usually lower in calcium but higher in protein |
| Part-skim mozzarella | 1.5 oz (42 g) | 333 mg | Vegetarian |
| Canned sardines with bones | 3 oz (85 g) | 325 mg | Also gives some vitamin D and omega-3 |
| Skimmed milk | 1 cup (240 ml) | 299 mg | Whole milk: 276 mg |
| Calcium-fortified soy milk | 1 cup (240 ml) | 299 mg | Vegan; shake the carton, as calcium settles |
| Firm tofu made with calcium sulfate | ½ cup (about 125 g) | 253 mg | Vegan; check the label for “calcium sulfate” |
| Canned pink salmon with bones | 3 oz (85 g) | 181 mg | Mash the soft bones in |
| Kale, cooked | 1 cup | 94 mg | Absorbed about as well as milk calcium |
| Chia seeds | 1 tablespoon | 76 mg | Vegan; easy to add to porridge |
| Spinach, boiled | ½ cup | 123 mg | Only about 5% is absorbed |
Why spinach does not count much
Spinach looks good on paper, but it is high in oxalate, which binds calcium so your body cannot use most of it. The NIH lists collard greens, sweet potatoes, rhubarb and beans as other oxalate-rich foods. Keep eating them for fibre and other nutrients, just do not rely on them for calcium. Kale, broccoli and cabbage are much better, with absorption similar to milk.
If you eat little or no dairy
Plant-based eating can easily cover your calcium needs, with a little planning. Build each day around two or three of these: fortified soy or oat milk, calcium-set tofu, fortified plant yogurt, chia seeds, and greens such as kale, bok choy or broccoli. Check that plant milks say “calcium fortified” on the label, because organic versions are often not fortified. If you are also watching protein, our guide to how much protein women need after 35 shows how tofu and soy milk do double duty.
The best vitamin D foods
Few foods are naturally rich in vitamin D, which is why supplements are so common. These are the most useful, again from NIH data.
| Food | Serving | Vitamin D |
|---|---|---|
| Rainbow trout, farmed, cooked | 3 oz (85 g) | 16.2 mcg (645 IU) |
| Sockeye salmon, cooked | 3 oz (85 g) | 14.2 mcg (570 IU) |
| UV-exposed white mushrooms, raw | ½ cup, sliced | 9.2 mcg (366 IU) |
| Fortified 2% milk | 1 cup (240 ml) | 2.9 mcg (120 IU) |
| Atlantic sardines, canned in oil | 2 sardines | 1.2 mcg (46 IU) |
| Egg, large | 1 egg | 1.1 mcg (44 IU) |
Vegetarians have fewer options: UV-exposed mushrooms (look for “high in vitamin D” on the pack), eggs, and fortified milks, plant milks, cereals or spreads. Vitamin D fortification varies a lot between countries, so read labels rather than assuming.
A 2-minute calcium check
You do not need an app to see whether you are close. Try this with yesterday’s food:
- Write down every dairy food, fortified milk or yogurt, tofu, canned fish with bones, and leafy green you ate.
- Give each one its value from the table above. Halve or double it if your portion was smaller or bigger.
- Add them up. Ignore spinach.
- Compare the total with your target from the first table.
If you are well short most days, add one serving at a time before reaching for a supplement. A yogurt at breakfast and a glass of fortified milk or soy milk later in the day can add around 700 mg between them.
A sample calcium-rich day
- Breakfast: 1 cup plain yogurt with 1 tablespoon chia seeds and fruit (about 490 mg). More ideas in our vegetarian high-protein breakfasts.
- Lunch: wholegrain wrap with canned sardines or salmon, or a calcium-set tofu salad (about 180–325 mg).
- Snack: a latte made with milk or fortified soy milk (about 300 mg per cup of milk).
- Dinner: stir-fry with kale or broccoli and tofu, or pasta with a little mozzarella.
That lands comfortably near 1,000 mg without a single tablet, and the same day covers a good share of your protein, too.
Should you take supplements?
Food comes first, because it brings protein, potassium and other bone-friendly nutrients along with the calcium. Supplements make sense if you cannot reach your target through food, or if your doctor finds low vitamin D.
How to take calcium well
- Keep doses small. Absorption is best at 500 mg or less at a time, so split larger amounts across the day.
- Know your type. Calcium carbonate is 40% elemental calcium and works best with food. Calcium citrate is 21% calcium and can be taken with or without food.
- Top up, do not double up. Count what you already get from food, and only supplement the gap.
- Space it from some medicines. Calcium can interact with certain antibiotics, thyroid medication and other drugs, so ask your pharmacist about timing. If you take iron, our iron for women guide explains why to keep the two apart.
How to take vitamin D well
For most adults, a daily 10–15 mcg (400–600 IU) supplement fits the NHS and NIH advice. Take it with a meal that contains some fat. Do not go above 100 mcg (4,000 IU) a day unless your doctor prescribes it, because too much vitamin D can raise blood calcium.
Safety note: The NIH notes that higher intakes of calcium from supplements might raise the risk of kidney stones, and some evidence suggests calcium supplements could affect heart health, though findings are mixed. If you have had kidney stones, have kidney disease, take regular medication or have been told you have low bone density, talk to your doctor before starting supplements.
Should you get your vitamin D tested?
Routine testing is not recommended for everyone, but ask your doctor about a blood test if you are rarely outdoors, cover most of your skin, have dark skin, have a condition that affects absorption, or have had a fracture from a minor fall. The test measures 25-hydroxyvitamin D. The NIH describes these ranges:
| Blood level | What it generally means |
|---|---|
| Below 30 nmol/L (below 12 ng/mL) | Linked with vitamin D deficiency |
| 30 to under 50 nmol/L (12 to under 20 ng/mL) | Generally considered inadequate for bone and overall health |
| 50 nmol/L or more (20 ng/mL or more) | Generally considered adequate |
| Above 125 nmol/L (above 50 ng/mL) | Possible adverse effects, especially above 150 nmol/L (60 ng/mL) |
Labs in different countries report in different units, so check whether your result is in nmol/L or ng/mL before comparing.
Nutrients are half the story: load your bones too
Calcium and vitamin D supply the raw materials, but bones respond to force. Lifting weights, brisk walking with some hills, stair climbing and small jumps (if your joints allow) all signal your skeleton to stay strong. If you are not lifting yet, our strength training plan for women over 35 takes about three hours a week and is a simple place to start.
FAQ
How much calcium should a woman over 40 take daily?
In the US and Australia, women up to 50 need about 1,000 mg a day from food and supplements combined. In the EU the reference is 950 mg, and in the UK 700 mg. Most women can get there with three good servings of calcium-rich foods.
Is it better to get calcium from food or supplements?
Food first. It comes with protein and other nutrients your bones need, and you are less likely to overshoot. Supplements are useful to fill a gap you cannot close with food.
Can I take calcium and vitamin D together?
Yes. Many supplements combine them, and vitamin D helps you absorb calcium. Just keep the calcium dose at 500 mg or less per serving and stay within the vitamin D upper limit.
What is the best time to take calcium?
Take calcium carbonate with a meal. Calcium citrate can be taken at any time. If you need more than 500 mg, split it between breakfast and dinner.
Do I need vitamin D if I live somewhere sunny?
Maybe not, if you spend regular time outdoors with some skin uncovered. But office life, covering clothing, sunscreen and darker skin all reduce how much you make. If you are unsure, ask your doctor whether a test makes sense for you.
Free tool: see how today’s habits could shape your strength and mobility at 50, 60 and 70 with Future You, and plan your bone-density and blood checks with the Health Check-Up Planner.
Sources
- NIH Office of Dietary Supplements. Calcium: fact sheet for health professionals.
- NIH Office of Dietary Supplements. Vitamin D: fact sheet for health professionals.
- NHS. Vitamins and minerals: calcium.
- NHS. Vitamins and minerals: vitamin D.
- EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on dietary reference values for calcium. EFSA Journal, 2015.
- NHMRC. Nutrient reference values for Australia and New Zealand: calcium.
This article is for general education and is not medical advice. Check with your doctor before starting a new training or nutrition plan, especially if you have a health condition.
