{"id":11809,"date":"2026-08-14T12:46:38","date_gmt":"2026-08-14T10:46:38","guid":{"rendered":"https:\/\/qneurope.com\/?p=11809"},"modified":"2026-08-14T12:46:39","modified_gmt":"2026-08-14T10:46:39","slug":"vitamin-d-deficiency-european-winter","status":"publish","type":"post","link":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/","title":{"rendered":"Vitamin D and the European Winter: Why Half a Continent Runs Low"},"content":{"rendered":"
\n

It’s half past four in Berlin, and the streetlights are already on. In Athens the sun is technically still up \u2014 low, orange, not doing much. You’ve had two coffees, a desk job, and maybe four minutes of direct daylight since Monday. Your doctor mentioned, almost in passing, that your last blood test flagged a vitamin D deficiency. You nodded, the way you nod at things you’ve heard before: from a friend, a headline, someone selling a bottle of something online. What you hadn’t heard was why this happens to so many people at once, every year, on schedule, or what “deficiency” even means next to the similar-sounding “insufficiency.”<\/p>\n\n\n\n

That’s the gap this piece tries to close. Not with alarm \u2014 with the actual numbers, the actual thresholds, and the parts researchers are still honest about not knowing.<\/p>\n\n\n\n

Your skin has a season, and winter isn’t it<\/h2>\n\n\n\n

Vitamin D synthesis in skin depends on a narrow band of ultraviolet B (UVB) radiation striking a compound called 7-dehydrocholesterol in the epidermis. That reaction needs the sun sitting reasonably high in the sky. Once its angle drops past a certain point (automatically, for months at a stretch, the further you are from the equator), the relevant UVB gets scattered and absorbed by the atmosphere before it ever reaches the ground.<\/p>\n\n\n\n

The demonstration of this is decades old and still holds up. Researchers exposed human skin samples to real winter sunlight in Boston (42.2\u00b0N) and Edmonton (52\u00b0N) and measured how much previtamin D3 the reaction produced. In Boston, exposure between November and February produced essentially none. In Edmonton, roughly the line running through Manchester or Rotterdam, the dead window ran from October clear through March.<\/p>\n\n\n\n

Lay that over a map of Europe and the picture isn’t subtle. Madrid sits around 40\u00b0N, Rome around 42\u00b0N, both already inside Boston’s no-synthesis band for part of the year. Paris is close to 49\u00b0N. Berlin, Warsaw, and London cluster around 51-52\u00b0N, Edmonton territory. Oslo, Stockholm, and Helsinki sit at 59-60\u00b0N, where the effective vitamin D winter isn’t a few weeks \u2014 it’s closer to half the year.<\/p>\n\n\n\n

Your skin is also the organ that gets the attention once the heating comes on and the air dries out \u2014 a separate concern from UVB synthesis, but the two happen to start in the same season. If the skincare side of winter is what brought you here, we’ve written separately about how skin needs shift through your 30s, 40s, and 50s<\/a>, including how QN Europe’s Swiss-developed Physio Radiance line approaches it.<\/p>\n\n\n\n

“Deficient” and “insufficient” aren’t the same word \u2014 and the mix-up matters<\/h2>\n\n\n\n

This is where casual reporting on the topic gets sloppy, and precision is the whole point here.<\/p>\n\n\n\n

“Vitamin D deficiency” and “vitamin D insufficiency” get used interchangeably in headlines, but they describe different concentrations of 25-hydroxyvitamin D (25(OH)D) in blood, the standard clinical marker, and different expert bodies draw the line differently. The US Institute of Medicine calls anything below 30 nmol\/L deficient, 30-50 nmol\/L insufficient, 50 nmol\/L or above sufficient. The Endocrine Society uses a stricter scale: deficient below 50 nmol\/L, insufficient 50-75 nmol\/L, normal above 75 nmol\/L. Same blood sample, two different verdicts, depending which threshold you’re reading it against.<\/p>\n\n\n\n

The most-cited attempt to put a continent-wide figure on this pooled data from 55,844 individuals across European studies. Using the stricter deficiency cutoff (<30 nmol\/L), 13.0% came back deficient on a year-round average \u2014 hiding a seasonal swing: 17.7% during extended winter (October-March), versus 8.3% in summer. Switch to the broader insufficiency threshold (<50 nmol\/L) and the yearly average jumps to 40.4%.<\/p>\n\n\n\n

So, 13% or 40%? Both are real numbers from the same dataset; neither is more honest than the other. They’re answering slightly different questions \u2014 and any article quoting just one figure without naming its threshold isn’t giving you the full picture.<\/p>\n\n\n\n

Who’s actually more likely to run low<\/h2>\n\n\n\n

Winter thins everyone’s reserves to some degree, but not evenly. A handful of factors stack the odds further.<\/p>\n\n\n\n

Who<\/th>Why<\/th><\/tr><\/thead>
Adults 60 and older<\/td>Skin becomes less efficient at the synthesis reaction with age \u2014 also the exact population the EFSA-authorised falling-risk claim targets<\/td><\/tr>
People with more melanin in their skin<\/td>Melanin absorbs UVB too, so meaningfully longer sun exposure is needed to trigger the same amount of synthesis<\/td><\/tr>
People who keep most of their skin covered outdoors<\/td>Less exposed surface area means less UVB reaches the reaction site, regardless of how sunny it is<\/td><\/tr>
People working indoors on a daytime schedule<\/td>The relevant window is roughly midday; a commute in the dark on both ends removes it entirely<\/td><\/tr>
People with obesity<\/td>Vitamin D is fat-soluble and partitions into adipose tissue, lowering what’s circulating in blood<\/td><\/tr>
Residents of Central and Northern Europe<\/td>Latitude alone puts most of the continent in a no-cutaneous-synthesis window for months, as above<\/td><\/tr>
Exclusively breastfed infants without supplementation<\/td>Breast milk is a naturally poor source of vitamin D, independent of the mother’s own status<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

If two or more of these apply to you, a 25(OH)D blood test is a more useful next step than guessing.<\/p>\n\n\n\n

What we reviewed for this piece, and where the evidence gets thin<\/h2>\n\n\n\n

We went through EFSA’s dietary reference opinion, the pan-European pooled analysis above, and two of the largest vitamin D outcome trials ever conducted before writing any of this. Here’s the honest split between what’s solid and what isn’t.<\/p>\n\n\n\n

Solid: EFSA’s Adequate Intake for vitamin D is 15 \u00b5g (600 IU) per day for the general population over one year old. Worth noting: EFSA calls this an “Adequate Intake,” not a Recommended Dietary Allowance. The panel judged existing evidence insufficient to derive a full reference intake with the usual statistical confidence. That’s EFSA being upfront about the limits of what’s known, not us softening a number. The Tolerable Upper Intake Level sits at 100 \u00b5g (4,000 IU) per day for adults, including pregnant and breastfeeding women. That’s a ceiling for sustained intake from all combined sources, not a target to aim for.<\/p>\n\n\n\n

Also solid, and this is the part supplement marketing tends to gloss over: vitamin D’s legally authorised functions in the EU are specific, and mostly skeletal. It contributes to the normal function of the immune system, the maintenance of normal bones, normal blood calcium levels, the maintenance of normal muscle function, the maintenance of normal teeth, normal absorption and utilisation of calcium and phosphorus, and has a role in the process of cell division. Those seven phrases are the entire authorised vocabulary. Anything beyond them, on any product, in any EU country, isn’t backed by an EFSA claim assessment.<\/p>\n\n\n\n

Thin: nearly everything researchers hoped vitamin D might do once you step outside that list.<\/p>\n\n\n\n

Getting enough: sun, food, and where a supplement fits<\/h2>\n\n\n\n

Sun exposure isn’t a reliable route through a European winter, no matter how much time you spend outdoors \u2014 the UVB simply isn’t there, north of roughly 35\u00b0 latitude, for months at a time. That leaves food and supplementation.<\/p>\n\n\n\n

Food is a real but limited contributor. Oily fish (salmon, mackerel, herring, sardines), egg yolks, and fortified products (some margarines and plant milks, occasionally dairy) all add something, but rarely add up to 15 \u00b5g on a typical day unless fish is a regular fixture. It’s one of the few nutrients where even a good diet gets most people partway, not all the way, between October and March.<\/p>\n\n\n\n

That’s the honest context for where a supplement conversation belongs. LifeQode<\/a>, QN Europe’s nutrition line, is built on what the brand describes as the synergistic effect of its ingredients \u2014 vitamins and minerals rarely occur on their own in nature, so pairing them may make more physiological sense than isolating one. One LifeQode product, EDG3 Plus<\/a>, is built around its “Power of 3”: turmeric, vitamin D3, and a glutathione-amino acid blend, positioned around immune support, bone and joint health, energy and vitality, brain health, and digestion.<\/p>\n\n\n\n

For winter immune and cardiovascular support more broadly, separate from the vitamin D question, QN Europe also has Ol\u00e9, an olive leaf extract<\/a>. And if a seasonal energy slump brought you here more than a blood test result, Qaf\u00e9<\/a>, a green coffee product with Nutriose fibre, is aimed at that \u2014 a different problem, worth not conflating with a deficiency.<\/p>\n\n\n\n

What the big trials did \u2014 and didn’t \u2014 prove<\/h2>\n\n\n\n

The skeletal case for vitamin D is old and well established: without it, calcium absorption falls, and bones and teeth suffer \u2014 hence the narrow, specific EFSA claims listed above. Where the science gets disappointing is everything researchers hoped might follow from that foundation.<\/p>\n\n\n\n

The largest, cleanest test is the VITAL trial: 25,871 US adults given 2,000 IU of vitamin D3 daily (well above the EU’s 15 \u00b5g reference intake) for a median of 5.3 years, tracked for cancer and cardiovascular events. Supplementation did not lower invasive cancer incidence or major cardiovascular events compared with placebo. A related study, VITAL-DEP, followed 18,353 adults aged 50+ on the same dose specifically for depression prevention, and found no benefit there either.<\/p>\n\n\n\n

That’s two of the largest, most rigorously designed vitamin D trials ever run, and both came back null on their headline questions. It doesn’t mean vitamin D is worthless outside bone health. A trial can miss a real but smaller effect, and research on narrower subgroups continues. But the popular version of this story, where vitamin D is a general-purpose fix for heart disease, mood, or resistance to something like COVID-19, isn’t what the best current evidence shows. Autoimmune disease is an active area with some interesting, unreplicated signals: not yet solid enough to build a recommendation on. If a deficiency is confirmed on a blood test, that’s a conversation for a doctor, not a decision made in a supplement aisle \u2014 correcting it is a medical matter, with a dose your clinician sets against your actual number.<\/p>\n\n\n\n

Don’t chase a number that isn’t there<\/h2>\n\n\n\n

Vitamin D is fat-soluble, which means, unlike vitamin C or the B vitamins, your body stores the surplus instead of flushing it out. That’s why the 100 \u00b5g Tolerable Upper Intake Level for adults exists: sustained intake above it, from food and supplements combined, carries a genuine risk of toxicity, most commonly through excess calcium building up in the blood.<\/p>\n\n\n\n

Megadosing on the logic that more must be better is the one clearly wrong move here. If you supplement, add up the total from every source against that 100 \u00b5g ceiling, not just whatever’s in the one bottle on your counter. And if a blood test has already told you you’re deficient, correcting it properly is a job for medical guidance and a follow-up test, not a self-directed high dose.<\/p>\n\n\n\n

Frequently Asked Questions<\/h2>\n\n\n\n

How much vitamin D do I actually need per day?<\/strong><\/p>\n\n\n\n

EFSA’s reference is an Adequate Intake of 15 \u00b5g (600 IU) per day for the general population over one year old \u2014 a population baseline, not a personalised prescription. Your doctor can tell you if your situation calls for something different.<\/p>\n\n\n\n

Can food alone get me through winter?<\/strong><\/p>\n\n\n\n

For most people, not reliably. Oily fish, egg yolks, and fortified products all contribute, but few diets deliver 15 \u00b5g on a typical day without fish appearing regularly. It’s a meaningful partial contribution during the darker months, not the whole answer.<\/p>\n\n\n\n

Is it possible to get too much vitamin D?<\/strong><\/p>\n\n\n\n

Yes, and it’s worth taking seriously precisely because the vitamin is popular right now. It’s fat-soluble, so the body stores excess rather than excreting it, and sustained intake above the 100 \u00b5g Tolerable Upper Intake Level can lead to toxicity. More isn’t automatically better here.<\/p>\n\n\n\n

Do I need a blood test, or can I just start taking something?<\/strong><\/p>\n\n\n\n

A 25(OH)D blood test is the only way to know your actual status rather than guess \u2014 the sensible first move if you’re in a higher-risk group, or considering anything beyond a general-population dose. A confirmed deficiency should be corrected under medical guidance, at a dose matched to your number.<\/p>\n\n\n\n

Does vitamin D really help with colds, low mood, or general immune resilience?<\/strong><\/p>\n\n\n\n

The authorised claim is narrower than the popular idea: vitamin D contributes to the normal function of the immune system \u2014 a baseline physiological role, not a treatment claim. Large trials on broader outcomes, including a depression-prevention study with over 18,000 participants, haven’t found a supplementation benefit. It’s an honest gap between what the biology suggests and what the trials have shown.<\/p>\n\n\n\n

I live in Southern Europe \u2014 does any of this still apply to me?<\/strong><\/p>\n\n\n\n

Somewhat less than someone in Oslo, but yes. Madrid and Rome sit close enough to the same latitude band to produce a measurable winter gap, and the pan-European pooled analysis found deficiency in every region studied, south included, just at lower rates. Time outdoors at midday and how much skin is covered matter as much as raw latitude.<\/p>\n\n\n\n

The Short Version<\/h2>\n\n\n\n

Vitamin D deficiency in Europe is a seasonal, latitude-driven problem: above roughly 35\u00b0N, essentially the whole continent, the skin’s UVB-triggered synthesis reaction shuts down for months each winter. A pan-European pooled analysis of 55,844 people found 13.0% with severe deficiency (25(OH)D <30 nmol\/L) on a year-round average, rising to 17.7% in extended winter, while the broader insufficiency threshold (<50 nmol\/L) captured 40.4%. Two numbers measuring two different clinical cutoffs, not a contradiction. EFSA sets an Adequate Intake of 15 \u00b5g\/day and a Tolerable Upper Intake Level of 100 \u00b5g\/day for adults. Trial evidence for benefits beyond bone and muscle health (cardiovascular disease, depression) has been consistently null in the largest studies run to date. Your skin doesn’t know what season it’s “supposed” to be; it only knows what UVB is reaching it, and on a European afternoon in January, the honest answer is: not much. For where a supplement fits into that picture without overstating it, see the note above on LifeQode’s EDG3 Plus<\/a>.<\/p>\n\n\n\n

Geography, not a personal failing<\/h2>\n\n\n\n

None of this makes winter vitamin D deficiency a crisis, exactly. It’s closer to a predictable, well-documented fact of living this far from the equator \u2014 like needing a coat, except this shortfall doesn’t announce itself with cold fingers. More often it shows up as fatigue you quietly blame on the season, or it shows up as nothing at all, until a blood test says otherwise.<\/p>\n\n\n\n

What doesn’t get said out loud enough: the sun was never going to fix this for you past a certain latitude, no matter how many lunchtime walks you took in November. That’s not a lifestyle failing to correct with more willpower. It’s geography, on a schedule the calendar already knew about before you did.<\/p>\n\n\n\n

If you’re reading this because a test flagged something, the honest next step isn’t a purchase \u2014 it’s a conversation with whoever ordered that test, about a dose matched to your actual number. If you’re just trying to get ahead of the season generally, the two figures above (15 \u00b5g as the baseline, 100 \u00b5g as the ceiling) are what to check any label against, ours included.<\/p>\n\n\n\n

Where Our Range Fits<\/h2>\n\n\n\n

If a winter top-up is what you’re after, EDG3 Plus<\/a> is where vitamin D3 sits in our LifeQode<\/a> range, combined with turmeric and a glutathione-amino acid blend rather than sold as an isolated vitamin. That pairing is deliberate: nutrients rarely turn up alone in food, and we’d rather formulate the way they occur.<\/p>\n\n\n\n

Two honest notes before you decide. Vitamin D’s authorised benefits in the EU are the seven phrases listed earlier, and we won’t stretch them past that. And whatever you choose, ours or anyone’s, read the label against 15 \u00b5g and 100 \u00b5g before you buy. If you’d like help working out where a supplement fits alongside what you already eat, that’s a conversation our team is glad to have.<\/p>\n\n\n\n

\n\n\n\n

Written and source-checked by the QN Europe editorial team. We work from peer-reviewed research and stay open about what it doesn’t yet show. Have a question, or your own experience with this? Write to us. We read everything.<\/em><\/p>\n<\/main>","protected":false},"excerpt":{"rendered":"

It’s half past four in Berlin, and the streetlights are already on. In Athens the sun is technically still up \u2014 low, orange, not doing much. You’ve had two coffees, a desk job, and maybe four minutes of direct daylight since Monday. Your doctor mentioned, almost in passing, that your last blood test flagged a […]<\/p>\n","protected":false},"author":5,"featured_media":11855,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61],"tags":[],"class_list":["post-11809","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-health"],"yoast_head":"\nVitamin D Deficiency in Europe: A Winter Guide<\/title>\n<meta name=\"description\" content=\"Why does half of Europe run low on vitamin D every winter? The real deficiency numbers, the sun science, and how much you need.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Vitamin D Deficiency in Europe: A Winter Guide\" \/>\n<meta property=\"og:description\" content=\"Why does half of Europe run low on vitamin D every winter? The real deficiency numbers, the sun science, and how much you need.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/\" \/>\n<meta property=\"og:site_name\" content=\"QN Europe\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-14T10:46:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-14T10:46:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/qneurope.com\/wp-content\/uploads\/2026\/08\/9.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"654\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"salihqn\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"salihqn\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"15 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/\"},\"author\":{\"name\":\"salihqn\",\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/#\\\/schema\\\/person\\\/f31275953c5e4ba8a55f8dc450314a29\"},\"headline\":\"Vitamin D and the European Winter: Why Half a Continent Runs Low\",\"datePublished\":\"2026-08-14T10:46:38+00:00\",\"dateModified\":\"2026-08-14T10:46:39+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/\"},\"wordCount\":2710,\"publisher\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/qneurope.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/9.webp\",\"articleSection\":[\"Health\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/\",\"url\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/\",\"name\":\"Vitamin D Deficiency in Europe: A Winter Guide\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/qneurope.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/9.webp\",\"datePublished\":\"2026-08-14T10:46:38+00:00\",\"dateModified\":\"2026-08-14T10:46:39+00:00\",\"description\":\"Why does half of Europe run low on vitamin D every winter? The real deficiency numbers, the sun science, and how much you need.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/#primaryimage\",\"url\":\"https:\\\/\\\/qneurope.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/9.webp\",\"contentUrl\":\"https:\\\/\\\/qneurope.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/9.webp\",\"width\":1200,\"height\":654},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/vitamin-d-deficiency-european-winter\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Startseite\",\"item\":\"https:\\\/\\\/qneurope.com\\\/en\\\/home\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Vitamin D and the European Winter: Why Half a Continent Runs Low\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/qneurope.com\\\/en\\\/\",\"name\":\"QN Europe\",\"description\":\"Dein Partner f\u00fcr eine aufregende Zukunft\",\"publisher\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/qneurope.com\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/#organization\",\"name\":\"QN Europe\",\"url\":\"https:\\\/\\\/qneurope.com\\\/en\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/qneurope.com\\\/wp-content\\\/uploads\\\/2025\\\/01\\\/cropped-qn-europe-logo.webp\",\"contentUrl\":\"https:\\\/\\\/qneurope.com\\\/wp-content\\\/uploads\\\/2025\\\/01\\\/cropped-qn-europe-logo.webp\",\"width\":500,\"height\":53,\"caption\":\"QN Europe\"},\"image\":{\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/qneurope.com\\\/en\\\/#\\\/schema\\\/person\\\/f31275953c5e4ba8a55f8dc450314a29\",\"name\":\"salihqn\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Vitamin D Deficiency in Europe: A Winter Guide","description":"Why does half of Europe run low on vitamin D every winter? The real deficiency numbers, the sun science, and how much you need.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/","og_locale":"en_US","og_type":"article","og_title":"Vitamin D Deficiency in Europe: A Winter Guide","og_description":"Why does half of Europe run low on vitamin D every winter? The real deficiency numbers, the sun science, and how much you need.","og_url":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/","og_site_name":"QN Europe","article_published_time":"2026-08-14T10:46:38+00:00","article_modified_time":"2026-08-14T10:46:39+00:00","og_image":[{"width":1200,"height":654,"url":"https:\/\/qneurope.com\/wp-content\/uploads\/2026\/08\/9.webp","type":"image\/webp"}],"author":"salihqn","twitter_card":"summary_large_image","twitter_misc":{"Written by":"salihqn","Est. reading time":"15 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/#article","isPartOf":{"@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/"},"author":{"name":"salihqn","@id":"https:\/\/qneurope.com\/en\/#\/schema\/person\/f31275953c5e4ba8a55f8dc450314a29"},"headline":"Vitamin D and the European Winter: Why Half a Continent Runs Low","datePublished":"2026-08-14T10:46:38+00:00","dateModified":"2026-08-14T10:46:39+00:00","mainEntityOfPage":{"@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/"},"wordCount":2710,"publisher":{"@id":"https:\/\/qneurope.com\/en\/#organization"},"image":{"@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/#primaryimage"},"thumbnailUrl":"https:\/\/qneurope.com\/wp-content\/uploads\/2026\/08\/9.webp","articleSection":["Health"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/","url":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/","name":"Vitamin D Deficiency in Europe: A Winter Guide","isPartOf":{"@id":"https:\/\/qneurope.com\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/#primaryimage"},"image":{"@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/#primaryimage"},"thumbnailUrl":"https:\/\/qneurope.com\/wp-content\/uploads\/2026\/08\/9.webp","datePublished":"2026-08-14T10:46:38+00:00","dateModified":"2026-08-14T10:46:39+00:00","description":"Why does half of Europe run low on vitamin D every winter? The real deficiency numbers, the sun science, and how much you need.","breadcrumb":{"@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/#primaryimage","url":"https:\/\/qneurope.com\/wp-content\/uploads\/2026\/08\/9.webp","contentUrl":"https:\/\/qneurope.com\/wp-content\/uploads\/2026\/08\/9.webp","width":1200,"height":654},{"@type":"BreadcrumbList","@id":"https:\/\/qneurope.com\/en\/vitamin-d-deficiency-european-winter\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Startseite","item":"https:\/\/qneurope.com\/en\/home\/"},{"@type":"ListItem","position":2,"name":"Vitamin D and the European Winter: Why Half a Continent Runs Low"}]},{"@type":"WebSite","@id":"https:\/\/qneurope.com\/en\/#website","url":"https:\/\/qneurope.com\/en\/","name":"QN Europe","description":"Dein Partner f\u00fcr eine aufregende Zukunft","publisher":{"@id":"https:\/\/qneurope.com\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/qneurope.com\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/qneurope.com\/en\/#organization","name":"QN Europe","url":"https:\/\/qneurope.com\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/qneurope.com\/en\/#\/schema\/logo\/image\/","url":"https:\/\/qneurope.com\/wp-content\/uploads\/2025\/01\/cropped-qn-europe-logo.webp","contentUrl":"https:\/\/qneurope.com\/wp-content\/uploads\/2025\/01\/cropped-qn-europe-logo.webp","width":500,"height":53,"caption":"QN Europe"},"image":{"@id":"https:\/\/qneurope.com\/en\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/qneurope.com\/en\/#\/schema\/person\/f31275953c5e4ba8a55f8dc450314a29","name":"salihqn"}]}},"_links":{"self":[{"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/posts\/11809","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/comments?post=11809"}],"version-history":[{"count":3,"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/posts\/11809\/revisions"}],"predecessor-version":[{"id":11826,"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/posts\/11809\/revisions\/11826"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/media\/11855"}],"wp:attachment":[{"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/media?parent=11809"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/categories?post=11809"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qneurope.com\/en\/wp-json\/wp\/v2\/tags?post=11809"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}