Vitamin D Deficiency and Menopause: Approach and Advice

A vitamin D deficiency during menopause affects not only your energy, but also your bone density and muscle strength at a time when your body is already producing less estrogen. This article explains why that combination deserves extra attention and what you can concretely do about it.

In short

• Vitamin D deficiency is more common during and after menopause, often occurring alongside declining bone density.
• Bone mass loss reaches up to 10-20% in the first five years after menopause; vitamin D supports the calcium absorption needed for that.
• Blood testing for vitamin D is part of Menovia's four diagnostic pillars, alongside DNA, microbiome, and hormone testing.
• At Menovia, vitamin D3 is dosed based on blood values and/or a demonstrated deficiency, with a target range of 100 to 150 nmol/L.
• A supplement without blood monitoring is guesswork; vitamin D symptoms during menopause call for a measured approach, not a fixed bottle from the pharmacy.

Why this matters

Estrogen plays a role in slowing bone breakdown. When production declines during menopause, bone mass loss accelerates: research from the North American Menopause Society (NAMS) shows that women can lose 10 to 20% of their bone mass in the first five years after menopause. Calcium is the building block for new bone, and vitamin D is needed to absorb that calcium in the gut; without enough vitamin D, calcium from food or supplements doesn't reach where it's needed as effectively.

In addition, skin becomes less efficient at producing vitamin D from sunlight as you age, which further increases the risk of a deficiency during menopause. A deficiency is defined in Dutch primary care practice as a blood value below 30 nmol/L, according to the NHG guideline. Symptoms like fatigue, muscle pain, and low mood overlap strongly with menopause symptoms, which is why vitamin D deficiency is often overlooked.

Who this is relevant for

This article is intended for women in perimenopause or postmenopause who recognize persistent fatigue, muscle pain, or bone fractures in the family, spend little time outdoors, have darker skin, or have a higher body weight (vitamin D dissolves in fat tissue and therefore enters the bloodstream less easily). Want to know how long your menopause typically lasts and which phase you're in? This article on the duration of menopause gives more context on the timeline in which bone loss and vitamin D deficiency can occur together.

What to look for with vitamin D deficiency during menopause

1. Your blood value, not just your symptoms

Fatigue and muscle pain say little on their own, since they also fit sleep problems or fluctuating hormones. Only a blood test shows whether you're below 30 nmol/L (deficiency according to the NHG guideline) or between 30 and 50 nmol/L (borderline range). Without that measurement, you don't know whether a supplement is even needed.

2. The form of vitamin D: D3 versus D2

Vitamin D3 (cholecalciferol) raises blood values more effectively and for longer than D2 (ergocalciferol), a difference shown in multiple comparative studies. For women during menopause who want to maintain their level structurally, D3 is the more logical choice than a random multivitamin with D2.

3. Dosage tailored to your starting value

A woman with a value of 20 nmol/L needs a different approach than someone at 45 nmol/L. At Menovia, BIG-registered doctors determine the vitamin D3 dose based on blood values and/or a demonstrated deficiency, not on a single fixed maintenance dose. The target blood value is 100 to 150 nmol/L; the dose and follow-up testing are therefore part of your personal treatment plan.

4. Combination with calcium and magnesium

Vitamin D doesn't work in isolation from the rest of your mineral balance. Calcium is needed for bone building itself, and magnesium is a cofactor in converting vitamin D to its active form in the body. A supplement that ignores these two misses part of the mechanism.

5. Connection to your broader hormone profile

Vitamin D doesn't stand alone during menopause. It belongs alongside blood testing, DNA testing, microbiome analysis, and the DUTCH test in building a complete picture of what's happening in your body, something this article on hormone therapy at a menopause clinic covers further.

6. The timing of measurement

Vitamin D values fluctuate with the seasons: in the Netherlands they're often higher in autumn (after a sunny summer) than in early spring. A measurement in March therefore says something different than a measurement in October, and that's relevant when assessing supplement advice.

Approach: what helps with vitamin D deficiency during menopause

Sunlight, the free foundation. 15 to 20 minutes of uncovered skin in the sun between April and September provides enough vitamin D for most people. Advice: sunlight is a good foundation in the summer months, but in the Netherlands the sun's intensity from October to March is too low to produce enough vitamin D, so this alone isn't enough during that period.

Nutrition, the addition that falls short. Fatty fish, eggs, and fortified dairy provide vitamin D, but in amounts too low to resolve a diagnosed deficiency. Advice: use nutrition as an addition alongside a supplement or therapy, not as your only source if your blood value is already below 30 nmol/L.

D3 supplement, tailored to your blood value. At Menovia, the vitamin D3 dose is determined based on your blood values and/or a demonstrated deficiency, with a target range of 100 to 150 nmol/L. Choose D3 over D2 based on the higher effectiveness shown in comparative studies, but determine a higher dose only together with your doctor and with follow-up testing.

Blood testing and monitoring, the only way to know if it's working. At Menovia, a blood test for vitamin D is part of the four diagnostic pillars, alongside DNA, microbiome, and hormone testing. Blood testing takes place every 12 weeks; this lets the doctor assess whether the dose fits your blood value and treatment plan.

Combination with bio-identical hormone therapy, the simultaneous approach. Estrogen fluctuations and vitamin D deficiency often affect your bone density at the same time, which is why Menovia uses hormone therapy, lifestyle, and supplements simultaneously within the three programs, not one after another. Advice: discuss vitamin D as part of a broader plan with your BIG-registered doctor, rather than as a separate action item alongside your menopause symptoms.

What to avoid

• Taking a high dose of vitamin D without blood monitoring. Vitamin D is fat-soluble and accumulates in the body; with prolonged very high doses, this can lead to an excessively high calcium level in the blood. Measure first, dose after.
• Relying on fatigue as the only signal. Fatigue during menopause often has multiple simultaneous causes, including disrupted sleep and fluctuating thyroid values. A symptom doesn't automatically point to vitamin D.
• Only using vitamin D2 if you have a structural deficiency. D2 stays active in the body for a shorter time than D3, so your value drops back more quickly between doses.

Comparison at a glance

Approach, Cost, Effect on blood value, Suitable as a foundation, Monitoring needed: Sunlight (April-September) — Free — Moderate to good, seasonal — Partly — No. Nutrition (fatty fish, eggs) — Low — Limited — No, only as an addition — No. Supplement D3, dose based on blood values — Low — Good, if matched to starting value — Yes — Yes, every 12 weeks. Blood testing and monitoring — Part of diagnostics — N/A (measurement method) — Yes, as a starting point — Ongoing. Combination with hormone therapy — Part of program — Indirect, via bone metabolism — Yes, with broader symptoms — Every 12 weeks.

Frequently asked questions

Does vitamin D deficiency really relate to menopause?

Yes, vitamin D deficiency is more common during and after menopause because declining estrogen levels accelerate bone breakdown and vitamin D is needed for the calcium absorption that counters this. The combination increases the risk of accelerated bone mass loss, which can reach up to 10-20% in the first five years after menopause.

What's a normal vitamin D value during menopause?

A blood value below 30 nmol/L counts as a deficiency according to the NHG guideline, and 30-50 nmol/L as a borderline range. At Menovia, the target value is 100 to 150 nmol/L, established and monitored within your personal treatment plan.

How much vitamin D per day do I need during menopause?

The right dose of vitamin D3 depends on your blood value and any demonstrated deficiency. At Menovia, BIG-registered doctors determine the dose individually, with a target range of 100 to 150 nmol/L and monitoring through blood testing.

Is vitamin D3 better than D2 during menopause?

Yes, D3 (cholecalciferol) raises blood values more effectively and for longer than D2 (ergocalciferol), a difference shown in comparative studies. D3 is therefore the standard choice for supplementation.

Can too much vitamin D be harmful?

Yes, vitamin D is fat-soluble and accumulates with prolonged very high doses, which can lead to an excessively high calcium level in the blood. Dose based on a measured starting value, not by feel.

Does sunlight help against vitamin D deficiency in winter?

No, in the Netherlands the sun's intensity from October to March is too low to produce enough vitamin D through the skin. Supplementation is usually needed during those months, especially with an already diagnosed deficiency.

Is vitamin D part of Menovia's testing?

Yes, blood testing including vitamin D is one of the four diagnostic pillars at Menovia, alongside DNA testing, microbiome analysis, and the DUTCH test. This testing forms the basis for the treatment plan drawn up by a BIG-registered doctor.

Does vitamin D replace hormone therapy during menopause?

No, vitamin D supports calcium absorption for bone health, but doesn't affect estrogen levels themselves. At Menovia, vitamin D is therefore used simultaneously with bio-identical hormone therapy and lifestyle, not as a replacement.

In conclusion

The least-known part of this story is the role of your gut health: microbiome research shows that the absorption of fat-soluble vitamins like vitamin D partly depends on the composition of your gut flora, which explains why two women with the same supplement dose can end up with different blood values. That's exactly why a standalone bottle of vitamin D says less than a measured, repeated program.

Related articles

• Weight gain during menopause, what you can do about it
• Thyroid and hot flashes, how are they connected

This information is intended as an educational resource and does not replace medical advice, diagnosis, or treatment. If you have symptoms or questions about your personal situation, we recommend consulting a doctor.