Supplement
Calcium for women
Calcium is a mineral with EFSA-authorised roles in the maintenance of normal bones and teeth, and in normal muscle function and blood clotting. The adult RNI for women is 700 mg/day, rising to 1,250 mg/day while breastfeeding. Most adults get enough from a varied diet, so calcium is usually a diet question before it is a supplement one. Speak to your GP or pharmacist before starting a supplement, especially alongside other medication.
What it does
Calcium is an essential mineral. The roles permitted under EFSA-authorised health claims are factual and modest:
- Calcium is needed for the maintenance of normal bones.
- Calcium is needed for the maintenance of normal teeth.
- Calcium contributes to normal muscle function.
- Calcium contributes to normal blood clotting.
These are general nutritional roles, not a treatment claim for bone density loss or osteoporosis specifically. Bone health is assessed clinically, not by a supplement label.
Who it is for
Calcium needs are steady through most of adult life and rise specifically while breastfeeding. See our life-stage nutrient table for the full breakdown by age and stage, and our bone health hub for how calcium fits alongside vitamin D and fracture-risk assessment around perimenopause, menopause and the senior years.
What to look for when buying
- Most adults in the UK can get enough calcium from a varied diet (dairy, fortified plant milks, leafy greens, tinned fish with bones); check your intake before assuming you need a supplement.
- Calcium needs rise while breastfeeding (an extra 550 mg/day above the 700 mg adult RNI); see our life-stage nutrient table for the full breakdown.
- Vitamin D helps the body absorb calcium, which is why many products pair the two; check whether a calcium product also covers your vitamin D, so you are not double-dosing elsewhere.
- Taking calcium at the same time as iron or certain thyroid medications can reduce absorption of the other; space them out and check with your pharmacist if you take either.
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Check it yourself
Check any product's milligram amount against the recommended daily intake lookup and the upper safe limit checker before you buy.
Frequently asked questions
Do I need a calcium supplement?
Most adults in the UK can get enough calcium from a varied diet including dairy, fortified plant milks, leafy greens and tinned fish eaten with bones. Check what you actually eat before assuming you need a supplement; the adult RNI is 700 mg/day.
Does calcium need does change at menopause?
The Reference Nutrient Intake itself stays at 700 mg/day at 50+, the same as 19-50. What changes around perimenopause and menopause is bone density risk more broadly, which is why NICE guidance on fracture-risk assessment (CG146) specifically recommends considering assessment for women aged 65 and over. Calcium is one factor among several, not the whole picture.
Can I take calcium with my other supplements?
Calcium can reduce absorption of iron and some thyroid medications if taken at the same time, so space them out by a couple of hours. Vitamin D helps the body absorb calcium, which is why many products combine the two.
What happens if I take too much calcium?
The NHS advises not exceeding 1,500 mg/day of calcium from supplements, since very high intakes have been linked to side effects including kidney stones in some people. This is a supplement-only ceiling; dietary calcium is not counted the same way.
This is information, not medical advice, and is not a substitute for a registered clinician. Concerns about bone density or fracture risk should be raised with a GP, who can arrange a proper clinical assessment.
Editor, Her Vitals
Oliver leads Her Vitals's editorial coverage of women's life-stage health and supplements. He curates and reviews existing branded products across trying to conceive, pregnancy, postnatal, perimenopause, menopause and the senior years, weighing what the evidence supports against guidance from bodies such as EFSA, the NHS and NICE, and is clear that the content is information rather than medical advice.
Last reviewed: 8 June 2026
Reviewed by Oliver Mackman, Editor. Editorial review against published guidance; not a clinical review.