Supplements guide
Vitamin D and perimenopause: why it matters and how to supplement correctly
Vitamin D deficiency is common across the general population and becomes increasingly relevant during perimenopause, when its role in bone health, immune function, mood, and muscle strength all converge. This guide covers what the evidence says, how to choose the right supplement, and five products worth considering.
Our content is developed with input from a registered dietitian specialising in women’s health
Affiliate disclosure: This article contains affiliate links. If you purchase through them we may earn a small commission at no extra cost to you. This never influences our recommendations.
Why vitamin D matters during perimenopause
Vitamin D is not strictly a vitamin. Once converted by the liver and kidneys into its active form, it functions as a hormone, with receptors found in almost every tissue in the body. During perimenopause, adequate vitamin D status becomes particularly important across several areas that are directly affected by hormonal change.
Bone health
Oestrogen plays a key role in maintaining bone density. As it declines through perimenopause and into menopause, bone loss accelerates significantly. Vitamin D is essential for calcium absorption and bone mineralisation. Without adequate vitamin D, calcium supplementation has limited benefit for bone protection.
Mood and mental health
Vitamin D receptors are found throughout the brain. Low vitamin D status is consistently associated with depressive symptoms in observational research, and this relationship may be particularly relevant during perimenopause when mood is already more vulnerable to hormonal fluctuation. It is worth noting this is an association, not proof that supplementation treats or prevents low mood, see What the evidence shows on mood below.
Muscle strength and function
Vitamin D receptors in muscle tissue play a role in muscle protein synthesis and neuromuscular function. Deficiency is associated with muscle weakness and an increased risk of falls, both of which become more clinically relevant in the years around menopause.
Immune regulation
Vitamin D modulates both innate and adaptive immune responses and contributes to the normal function of the immune system. Adequate status supports this normal immune function generally.
Deficiency is more common than most women realise
Vitamin D deficiency is recognised as a significant public health issue in countries at higher latitudes, including the UK, much of Europe, and northern parts of the US and Canada, particularly during autumn and winter when sunlight exposure is insufficient for the body to synthesise adequate amounts. Women with darker skin tones, those who cover their skin for religious or cultural reasons, and those who spend limited time outdoors are at higher risk year round, regardless of where they live.
Oct
to April
Sunlight insufficient for synthesis at higher latitudes
10-15mcg
400-600IU
UK and US government minimum recommendations
50nmol/L
20ng/mL
Generally considered sufficient
Many nutrition researchers and practitioners consider these government minimums to be a floor rather than an optimal target, particularly for perimenopausal women. Doses of 1,000 to 2,000IU daily are more commonly used in clinical practice for women in this life stage, though individual needs vary and a blood test gives the most accurate picture.
D3 vs D2, and should you take K2 with it?
Vitamin D3 (cholecalciferol)
Choose thisD3 is the form produced by the skin in response to sunlight and the form found in animal-derived foods. Research consistently shows it raises and maintains blood levels of 25-hydroxyvitamin D more effectively than D2. This is the form to look for in any supplement.
Vitamin D2 (ergocalciferol)
Less effectiveD2 is plant-derived and the form used in many fortified foods. It is less effective at raising blood levels and has a shorter half-life. Some vegan supplements use D2, though lichen-derived D3 is now widely available as a vegan alternative.
Vitamin K2, worth considering alongside D3
For bone health focusK2 works alongside D3 to direct calcium into bones rather than soft tissue. For women with a specific focus on bone health during perimenopause, a D3 and K2 combination is a well-supported choice. The MK-7 form of K2 has the best evidence for bioavailability. If you are taking a standalone D3, adding a separate K2 supplement is a reasonable option. If bone health is a priority, look for a combined D3 and K2 product.
If you take warfarin, speak to your GP or healthcare provider before starting K2. Warfarin works by blocking the liver’s use of vitamin K, and K2 supplementation, even at low doses, can directly counteract this and reduce warfarin’s effectiveness. This does not apply in the same way to newer anticoagulants such as apixaban or rivaroxaban, which work through a different mechanism, but any blood-thinning medication is worth checking with a GP or healthcare provider before adding K2.
Quick comparison
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| Product | Form | Best for | Buy |
|---|---|---|---|
| BetterYou DLux 3000 Oral Spray | D3 oral spray | Easy daily use, absorption | View → |
| Thorne Vitamin D 1000 | D3 capsule 1000IU | Clean formulation, maintenance dose | View → |
| Cytoplan Daily D3 | D3 tablet 50mcg (2000IU) | Higher dose, UK brand | View → |
| Bare Biology Beam and Balance | D3 spray 4000IU | Higher dose, IFOS quality | View → |
| Nordic Naturals D3 1000 | D3 softgel 1000IU | Trusted brand, third-party tested | View → |
Product reviews
01 · Best for ease of use
BetterYou DLux 3000 Oral Spray
BetterYou’s DLux 3000 delivers 3000IU (75mcg) of vitamin D3 per spray via the oral mucosa, bypassing the digestive tract. This format is well suited to women who have digestive absorption issues or who simply prefer not to take capsules. BetterYou is a well-established UK brand and this is one of their most widely used products. Each bottle provides a large number of doses making it cost effective for daily use.
Form
D3 oral spray
Dose per spray
3000IU (75mcg)
Format
No capsules needed
Brand origin
UK
What we like
Convenient spray format, good dose, widely available, established UK brand.
02 · Best clean capsule
Thorne Vitamin D 1000
Thorne’s Vitamin D 1000 provides a straightforward 1000IU (25mcg) dose of D3 in a clean, minimal capsule with no unnecessary fillers or additives. Thorne is NSF Certified for Sport and has a strong track record in quality formulation. A reliable everyday option for women who want a simple, well-tested D3 at a maintenance dose. For those needing a higher dose, two capsules daily gives 2000IU.
Form
D3 capsule
Dose
1000IU (25mcg) per capsule
Certification
NSF Certified for Sport
Additives
None unnecessary
What we like
NSF certified, clean formulation, flexible dosing, strong quality track record.
03 · Best higher dose option
Cytoplan Daily D3 50mcg
Cytoplan’s Daily D3 provides 50mcg (2000IU) of D3 per tablet, a dose that sits above the UK and US government minimum recommendations and is more aligned with what research suggests is needed for optimal status in adults. Cytoplan is a UK supplement brand with transparent labelling and a charity-owned structure. A well-formulated tablet at a dose appropriate for many perimenopausal women, particularly through autumn and winter.
Form
D3 tablet
Dose
50mcg (2000IU) per tablet
Brand origin
UK, charity-owned
Good for
Autumn and winter use
What we like
Higher dose than most budget options, UK brand, transparent labelling, good value.
04 · Best higher dose spray
Bare Biology Beam and Balance Vitamin D3 Spray
Bare Biology’s Beam and Balance is a high-dose vitamin D3 oral spray providing 4000IU (100mcg) per spray. This dose is suited to women who have confirmed or suspected deficiency, or who want a higher maintenance dose through winter months. Bare Biology is the same UK brand known for their IFOS five-star certified omega-3 range, and the same commitment to clean formulation and transparent sourcing applies here.
Form
D3 oral spray
Dose per spray
4000IU (100mcg)
Brand
Bare Biology, UK
Good for
Confirmed deficiency or winter repletion
What we like
High dose in a convenient spray format, trusted UK brand, clean formulation consistent with their omega-3 range.
05 · Trusted everyday softgel
Nordic Naturals Vitamin D3 1000
Nordic Naturals’ Vitamin D3 1000 delivers 1000IU (25mcg) of D3 in a small softgel with olive oil for absorption. Nordic Naturals is the same brand known for their omega-3 range and applies the same third-party testing standards here. Non-GMO verified and lab tested for purity and potency. A straightforward, well-trusted option for women who want a reliable daily maintenance dose.
Form
D3 softgel with olive oil
Dose
1000IU (25mcg) per softgel
Testing
Third-party lab tested
Verified
Non-GMO verified
What we like
Third-party tested, non-GMO, comes in olive oil for absorption, consistently reliable quality from a well-established brand.
How to supplement vitamin D
Government recommendations vary slightly by country. In the UK, the NHS recommends 400IU (10mcg) daily as a minimum. In the US, the NIH’s Recommended Dietary Allowance is 600IU (15mcg) for adults up to 70, rising to 800IU (20mcg) over 70. Many nutrition researchers consider 1,000 to 2,000IU (25 to 50mcg) more appropriate for adults generally, particularly through autumn and winter. If you have had a blood test showing deficiency, a higher dose of 3,000 to 4,000IU may be appropriate until levels are restored. Always check with your GP or healthcare provider if you are unsure about dosing.
Vitamin D is fat-soluble. Take it with a meal containing fat for best absorption. There is some evidence suggesting morning intake may be preferable to evening, though the effect is modest.
A blood test (serum 25-hydroxyvitamin D) gives the most accurate picture of your current status. Your GP or healthcare provider can arrange this, or home finger-prick tests are available from various providers. Testing in autumn before starting supplementation is a sensible approach for those in the northern hemisphere.
Vitamin D toxicity is possible at very high doses taken long term, but is uncommon at doses up to 4,000IU daily in healthy adults. Both UK and US guidelines set the upper tolerable intake at 100mcg (4,000IU) daily for adults. Do not exceed this without medical supervision.
What the evidence shows on vitamin D and mood
The relationship between vitamin D and mood is genuinely worth separating into two different questions, because the evidence for each is quite different.
The first question is whether low vitamin D status is associated with depression. Here the evidence is fairly consistent: a 2013 systematic review and meta-analysis of over 31,000 participants found that people with depression had lower vitamin D levels on average than those without (Anglin et al., British Journal of Psychiatry, 2013). This is an association, not evidence that low vitamin D causes depression.
The second, more clinically useful question is whether taking a vitamin D supplement actually improves depressive symptoms. Here the evidence is considerably weaker. A 2014 systematic review of randomised controlled trials found inconsistent results, with some trials showing benefit and others showing none (Li et al., Journal of Clinical Endocrinology and Metabolism, 2014). Vitamin D is not a treatment for depression or low mood, and it should not be positioned as one. Correcting a genuine deficiency may support overall wellbeing as part of a broader picture, but it is not a clear fix for mood symptoms on its own.
Frequently asked questions
Should I take vitamin D every day in winter?
Yes, if you live at a higher latitude. In the UK, sunlight from October to April is insufficient to trigger meaningful vitamin D synthesis in the skin, and the same applies across much of northern Europe, Canada, and the northern United States. Health authorities in these regions recommend everyone consider a daily supplement of at least 400 to 600IU (10 to 15mcg) through these months. Many people benefit from supplementing year round, particularly if they spend limited time outdoors.
Does vitamin D help with perimenopause symptoms?
Vitamin D is not a treatment for perimenopause symptoms in the way that HRT is. Its value during perimenopause is primarily in supporting bone health, muscle function, and immune regulation, all of which are areas that become more vulnerable during this transition. Correcting a deficiency can make a meaningful difference to how you feel generally, though it is not a fix for mood or hot flush symptoms specifically.
Do I need to take K2 with vitamin D?
K2 is not essential with vitamin D supplementation for most purposes, but it is a reasonable addition for women with a specific focus on bone health. K2 helps direct the calcium that vitamin D helps absorb into bones rather than soft tissue. If bone health is a priority, look for a combined D3 and K2 product or add a separate K2 (MK-7 form). If you take warfarin, check with your GP or healthcare provider first, as K2 can interfere with how warfarin works.
What is a good vitamin D level?
A serum 25-hydroxyvitamin D level of 50nmol/L (20ng/mL) or above is generally considered sufficient by both UK and US guidelines. Levels below 25 to 30nmol/L (roughly 10 to 12ng/mL) indicate deficiency. Some guidelines, including US Endocrine Society guidance, consider levels of 75nmol/L (30ng/mL) and above optimal for broader health outcomes, though the evidence at this higher end is less settled, and note that units differ: US labs typically report in ng/mL, while UK and most of Europe report in nmol/L.
Is it safe to take vitamin D with HRT?
Yes. There are no known clinically significant interactions between vitamin D supplementation at standard doses and HRT. Both work on different pathways and are commonly used together.
References (highest level of evidence first)
Systematic reviews and meta-analyses
- Ceglia L, Harris SS. Vitamin D and its role in skeletal muscle. Calcified Tissue International. 2013;92(2):151-162. doi:10.1007/s00223-012-9645-y. PMID: 22968766.
- Anglin RES, Samaan Z, Walter SD, McDonald SD. Vitamin D deficiency and depression in adults: systematic review and meta-analysis. British Journal of Psychiatry. 2013;202(2):100-107. doi:10.1192/bjp.bp.111.106666. PMID: 23377209.
- Li G, Mbuagbaw L, Samaan Z et al. Efficacy of vitamin D supplementation in depression in adults: a systematic review. Journal of Clinical Endocrinology and Metabolism. 2014;99(3):757-767. doi:10.1210/jc.2013-3450. PMID: 24423304.
- Tripkovic L, Lambert H, Hart K et al. Comparison of vitamin D2 and vitamin D3 supplementation in raising serum 25-hydroxyvitamin D status: a systematic review and meta-analysis. American Journal of Clinical Nutrition. 2012;95(6):1357-1364. doi:10.3945/ajcn.111.031070. PMID: 22552031.
- Theuwissen E, Teunissen KJ, Spronk HMH et al. Effect of low-dose supplements of menaquinone-7 (vitamin K2) on the stability of oral anticoagulant treatment: dose-response relationship in healthy volunteers. Journal of Thrombosis and Haemostasis. 2013;11(6):1085-1092. doi:10.1111/jth.12203.
Guidelines
- Scientific Advisory Committee on Nutrition. Vitamin D and Health. 2016.
- National Institutes of Health, Office of Dietary Supplements. Vitamin D: Fact Sheet for Health Professionals.
- NICE Menopause Guideline NG23. National Institute for Health and Care Excellence. Updated 2023.
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