Guide

Micronutrients in perimenopause: vitamin D, magnesium, B12, omega-3

Around menopause, supplements are marketed especially hard. Some nutrients do deserve attention, but many promises do not hold up. This guide puts the four most discussed into context – with one principle: test first, then supplement.

Vitamin D: often low, small effect on muscle

The body makes vitamin D mainly from sunlight on the skin, which in northern Europe barely happens from October to March. Low winter levels are therefore common. For muscle strength the evidence is sobering: a meta-analysis in postmenopausal women found only a small, non-significant improvement in grip strength from vitamin D – mainly in women with low starting levels. Combined with strength training, older adults showed a somewhat larger effect on leg strength. The German Nutrition Society gives 20 micrograms (800 IU) per day as an estimate when the body makes none itself.

Magnesium: usually covered by diet

Magnesium is involved in hundreds of enzyme reactions, including in muscles and nerves. Good sources are wholegrains, legumes, nuts, seeds and green vegetables. A varied diet usually meets needs. High-dose supplements can cause diarrhoea; the German Federal Institute for Risk Assessment advises no more than 250 mg a day from supplements on top of food.

Vitamin B12: essential on a vegan diet

Vitamin B12 occurs in meaningful amounts only in animal foods. A review shows that deficiency is common among vegans and that supplementation effectively prevents it. Because the body stores B12 for a long time, deficiency often shows only after years – as tiredness, poor concentration or pins and needles. Vegans should supplement B12 permanently and have their status checked regularly (holo-TC or methylmalonic acid).

Omega-3 fatty acids

EPA and DHA are found mainly in oily sea fish such as salmon, herring or mackerel. Professional bodies recommend one to two fish meals a week. Plant sources like linseed oil, chia seeds and walnuts provide the precursor ALA, which the body converts only in small amounts. For people who eat no fish, algae oil is a direct source of EPA and DHA.

Test first, then supplement

Many supplements are unnecessary, some even harmful at high doses – fat-soluble vitamins like vitamin D can accumulate. A conversation with your GP or gynaecologist, possibly with a blood test, makes sense. For menopausal symptoms such as severe hot flushes or sleep problems, there are effective medical options to discuss there.

In short

Vitamin D is often low in winter – check needs with a blood test
Magnesium is usually covered by diet
B12 is essential on a vegan diet
Omega-3: one to two fish meals a week or algae oil
Do not take high-dose products without reason

Frequently asked questions

Do I need special products during menopause?

Not automatically. A balanced diet covers most nutrients. Supplements make sense when a deficiency is proven or likely, such as B12 on a vegan diet.

How do I get my vitamin D level tested?

With a blood test (25-OH vitamin D) at your GP. Without a specific reason it is often paid privately.

Can you overdose on vitamin D?

Yes. Persistently very high doses can raise calcium levels. Take high-dose products only after medical advice.

Sources

Abshirini M et al. (2020): Vitamin D supplementation on muscle strength and mobility in postmenopausal women: meta-analysis. J Hum Nutr Diet 33(2):207-21 PubMed DOI
Antoniak AE, Greig CA (2017): Combined resistance training and vitamin D supplementation in older adults: meta-analysis. BMJ Open 7(7):e014619 PubMed DOI
Fernandes S et al. (2024): Exploring vitamin B12 supplementation in the vegan population: a scoping review. Nutrients 16(10):1442 PubMed DOI