Supplements After 40 and Through Menopause: What Changes
How nutrient needs shift after 40 and around menopause: more calcium, less iron, vitamin D and B12, and what the evidence says about herbs for hot flushes.
6 min read
The biggest change after 40 comes with menopause. Falling oestrogen speeds up bone loss, so calcium and vitamin D matter more, and the calcium RDA for women rises from 1,000 mg to 1,200 mg a day after 50. Iron needs drop from 18 mg to 8 mg once periods stop. Herbal products for hot flushes have mixed evidence, so talk to a doctor before trying them.
Menopause usually happens between 45 and 55, but it can happen earlier[1]. This guide covers the nutrients whose official amounts change, what helps bones, and what research says about popular menopause supplements.
What changes in your nutrient needs after 40?
For women, the official amounts for calcium and iron change at 51, and vitamin D rises after 70. Magnesium and vitamin B12 stay the same. Here are the US Recommended Dietary Allowances (RDAs) from the NIH:
| Nutrient | Women 31–50 | Women 51+ |
|---|---|---|
| Calcium | 1,000 mg | 1,200 mg[2] |
| Iron | 18 mg | 8 mg[3] |
| Vitamin D | 15 mcg (600 IU) | 15 mcg (600 IU) to 70; 20 mcg (800 IU) over 70[4] |
| Magnesium | 320 mg | 320 mg[5] |
| Vitamin B12 | 2.4 mcg | 2.4 mcg[6] |
For men, calcium rises to 1,200 mg after 70[2], and vitamin D to 800 IU after 70[4]. UK amounts differ: the NHS says adults need 700 mg of calcium and 10 micrograms of vitamin D a day[7]. Whichever you follow, these are totals from food and supplements together.
Do I need calcium and vitamin D after menopause?
They matter more, but food is the first source of calcium, and vitamin D is the one most people need as a supplement. Lower oestrogen reduces calcium absorption and increases calcium loss, and women lose on average about 1% of their bone mineral density a year after menopause[2]. The NHS menopause advice is to eat calcium-rich foods such as milk, yoghurt and kale, get some sunlight, and take vitamin D supplements[8]. In the UK, everyone should consider 10 micrograms of vitamin D a day in autumn and winter[9].
If you do take calcium, a few practical points:
- Absorption is highest at 500 mg or less at a time[2], so larger amounts are often split.
- The upper limit for calcium is 2,000 mg a day from age 51[2]. Higher supplemental intakes might increase the risk of kidney stones[2].
- Don't exceed 100 micrograms (4,000 IU) of vitamin D a day unless your doctor advises it[9].
The calcium guide compares carbonate and citrate, and can I take vitamin D and calcium together covers the pairing.
Should I stop taking iron after menopause?
Most women need much less iron once periods stop, so check whether you still need it. The RDA falls from 18 mg to 8 mg a day after 50[3]. That's why multivitamins for adults over 50 often contain little or no iron, and more calcium, vitamin D and vitamin B12[10]. If a doctor has prescribed iron for low levels, keep following their advice. Otherwise, a 50+ formula is usually the better fit.
Do I need more vitamin B12 as I get older?
The amount you need doesn't change, but absorbing it can get harder. Atrophic gastritis, which reduces how well B12 is absorbed from food, affects about 2% of the general population but 8% to 9% of adults aged 65 and older, and between 3% and 43% of older adults living in the community have low B12, depending on the definition used[6]. Long-term metformin and stomach-acid medicines can also lower B12 levels[6]. If you take either, ask whether your B12 should be checked. More in the vitamin B12 guide.
Do supplements help with hot flushes?
The evidence is mixed, and some products carry risks. What NCCIH reports:
- Soy and red clover isoflavones: studies have had inconsistent results. Phytoestrogens appear safe short term, but long-term safety hasn't been established, and they may not be safe for women who shouldn't take oestrogen[11].
- Flaxseed: products were no more effective than a placebo for hot flushes[11].
- Black cohosh: a 2023 review of 22 studies found products containing it were potentially beneficial for overall menopause symptoms, with improvements in hot flushes but not anxiety or depression[12]. Rare cases of liver damage, some very serious, have been reported in people taking black cohosh products; it's uncertain whether the herb was responsible, but you should contact your provider if you develop signs such as dark urine and fatigue[12].
- DHEA: it's uncertain whether it helps, its long-term safety is unknown, and some evidence suggests even short-term use may cause harm, including liver damage[11].
The NHS advises talking to a doctor before taking herbal supplements or complementary medicines for menopause[8]. Treatments such as HRT are a conversation to have with your GP.
Which supplements need extra care after 40?
Vitamin A, and minerals that interact with bone and thyroid medicines. The NHS says women who have been through the menopause and older men, who are at higher risk of osteoporosis, should avoid more than 1.5 mg of vitamin A a day from food and supplements. Many multivitamins and fish liver oils contain vitamin A[13].
If you are prescribed an oral bisphosphonate such as alendronate for bone loss, take magnesium-rich supplements at least 2 hours before or after it[5]. Calcium may interact with levothyroxine[2], which is common in this age group; see the best time to take supplements for spacing.
What else protects your bones?
Exercise does a lot that supplements can't. The NHS highlights weight-bearing exercise, such as walking, running or dancing, and resistance exercise with weights, plus stopping smoking and cutting down on alcohol[8][7]. Adults aged 19 to 64 should also do muscle-strengthening activities on 2 or more days a week[7].
How Suppin helps
- Choose a goal-based plan such as Strength after menopause or Strong bones, and Suppin builds a routine by fixed safety rules, with a reason for each product.
- Tell it about medications and conditions; nutrients that may interact aren't added automatically and show "Review with a professional".
- The Nutrients tab adds up calcium, vitamin D, vitamin A and iron across all your labels and compares them with daily values and upper limits.
- With AI allowed, you can send a photo or PDF of a lab report to the assistant and have it explained in plain language. Nothing is stored.
Get Suppin on the App Store to set up a routine that fits this stage of life.
FAQ
The US RDA is 1,200 mg a day for women over 50, from food and supplements combined[2]. The NHS sets 700 mg a day for adults[7].
The NHS includes vitamin D supplements in its advice for protecting bones around menopause[8], and 10 micrograms a day is enough for most people[9].
Usually much less: the RDA drops from 18 mg to 8 mg a day after 50[3]. Keep taking iron only if a doctor has advised it.
It is generally well tolerated in studies, but rare cases of liver damage have been reported in people taking black cohosh products[12]. Talk to your doctor before taking it.
Studies have had inconsistent results, and the long-term safety of phytoestrogen supplements hasn't been established[11].
Sources
- NHS — Menopause and perimenopause
- NIH Office of Dietary Supplements — Calcium fact sheet
- NIH Office of Dietary Supplements — Iron fact sheet
- NIH Office of Dietary Supplements — Vitamin D fact sheet
- NIH Office of Dietary Supplements — Magnesium fact sheet
- NIH Office of Dietary Supplements — Vitamin B12 fact sheet
- NHS — Osteoporosis prevention
- NHS — Things you can do to help menopause and perimenopause symptoms
- NHS — Vitamin D
- NIH Office of Dietary Supplements — Multivitamin/mineral supplements fact sheet
- NCCIH — Menopausal Symptoms: In Depth
- NCCIH — Black Cohosh
- NHS — Vitamin A
Educational information, not medical advice. Check with your doctor or pharmacist before starting or changing supplements, especially if you take medication, are pregnant or have a health condition.
