Why So Many People in Sunny Dubai Are Low in Vitamin D

Think about an ordinary weekday in Dubai. You leave a basement car park in a car with tinted windows, drive to another car park beneath the office, and spend the day under air conditioning behind glass. The gym is indoors. Lunch is delivered. Walks happen after sunset for half the year, and in daylight you are covered up, wearing sunscreen, or both.

None of this is unhealthy. Avoiding the midday heat is sensible, and protecting your skin is important. But it explains a surprising finding about life in the UAE: in a city with sunshine almost every day, low vitamin D is remarkably common.

This guide looks at why that happens, what vitamin D deficiency can and can't feel like, and why a blood test beats guessing. If you are wondering about your own levels, our advanced blood panel explains how vitamin D is measured alongside other nutrient, metabolic and hormonal markers.

Why is vitamin D deficiency so common in Dubai?

Vitamin D deficiency is common in Dubai mainly because sunshine is plentiful but skin exposure is not. Most of the day is spent indoors or in cars, outdoor time shifts to early morning and evening when UVB is weak, and clothing and sunscreen cover much of the skin. Skin tone, body weight, age and diet add to the picture.

Your skin makes vitamin D when exposed to ultraviolet B (UVB) light, and several everyday factors limit that:

The research from the region supports this. A study by Al Anouti and colleagues (2011) of university students in Abu Dhabi found low average vitamin D levels even when tested in summer, with women, who reported more sun avoidance, tending to have lower levels than men. A larger single-centre analysis by Haq and colleagues (2016), covering more than 60,000 people of many nationalities tested at one Abu Dhabi hospital, found that around four in five had levels in the deficient or insufficient range. People who are sent for a blood test are not a random sample of the population, but studies in the UAE have repeatedly reported high rates of low vitamin D.

What does vitamin D do in the body?

Vitamin D helps the body absorb calcium and phosphate from food, which makes it central to healthy bones, teeth and muscles. Over time, a significant shortfall can lead to softened bones, known as osteomalacia in adults and rickets in children. Research is also exploring its role in immune and metabolic health.

Vitamin D behaves more like a hormone than a typical vitamin: the liver and then the kidneys convert it into its active form, which is why liver and kidney conditions, and some medicines, can affect levels. Many other links, from immunity to mood, show an association rather than clear cause and effect.

What are the signs of vitamin D deficiency?

Many people with low vitamin D have no symptoms at all. When signs do appear, they tend to be vague: tiredness, general aches, bone pain, muscle weakness or cramps, and sometimes low mood. Because these overlap with many other causes, symptoms alone cannot tell you whether vitamin D is low.

The signs most often described include:

Online lists of "14 signs" tend to stretch the evidence. Tiredness and aches can just as easily reflect poor sleep, stress, low iron or an underactive thyroid, as our guide to why you might always be tired explains.

Can low vitamin D cause hair loss?

Low vitamin D has been associated with some types of hair loss in research, but the evidence does not show that it directly causes hair to fall out. It is one of several factors, alongside iron, thyroid function, stress and genetics, that a doctor may check when shedding is unexplained.

Why is a blood test better than guessing?

A blood test is the only reliable way to know your vitamin D status. The test measures 25-hydroxyvitamin D, the form that reflects what your body has made from sunlight and taken in from food and supplements over recent weeks. It tells your doctor whether treatment is needed, and how much.

Guessing goes wrong in both directions. Some people feel well and are significantly deficient; others take vitamin D for months and miss the real cause of their tiredness.

Results need interpreting. Labs report vitamin D in nmol/L or ng/mL, and the thresholds for "deficient" and "insufficient" vary between international guidelines, so your doctor reads your result alongside your history, other markers such as calcium, and any medicines you take. Vitamin D can be checked on its own or as part of broader diagnostics and screening, which is often more useful when the question is "why do I feel like this?".

Is it safe to take vitamin D supplements without testing?

Standard low-dose vitamin D supplements are widely used and generally considered safe for most adults, but taking high doses without testing is not a good idea. Vitamin D is stored in the body, and too much over time can lead to vitamin D toxicity, raising calcium levels, which may cause nausea, thirst, confusion and kidney problems.

"How to raise vitamin D quickly" is a common search, but there is no safe shortcut to manage on your own. If your levels are low, a doctor may recommend a short higher-dose course, then a lower maintenance dose and a repeat test. The right amount depends on your starting level, body weight, absorption and health history.

Some medicines, including certain anti-seizure medicines and long-term steroids, can lower vitamin D levels, and others, such as some diuretics, may interact with high-dose supplements. Anyone with kidney disease, kidney stones or a condition affecting calcium should take advice before supplementing.

Should you get more sun to raise your vitamin D?

Do not start sunbathing to fix low vitamin D. Dubai's UV is strong enough to cause sunburn quickly, and repeated sun exposure raises the risk of skin cancer, premature skin ageing and pigmentation. Whether brief, sensible exposure is appropriate for you is a conversation to have with your doctor.

This is a genuine trade-off. For someone with fair skin, a history of skin cancer, or melasma, extra sun carries a real cost, and testing and supplementing under medical guidance is usually the more sensible route. We explain why the region's sun is so hard on pigment-prone skin in why pigmentation is so common in Dubai. Daily sunscreen remains important, and you should not abandon it to chase vitamin D.

What foods are high in vitamin D?

Few foods are naturally rich in vitamin D. The main dietary sources are oily fish such as salmon, sardines and mackerel, egg yolks, liver, and foods fortified with vitamin D, such as some milks, yoghurts, breakfast cereals and spreads. Mushrooms exposed to UV light also contain some.

Diet helps, but correcting a true deficiency through food alone is difficult. Fortification varies between brands, so check labels, particularly if you follow a plant-based diet or avoid dairy.

Who should consider having their vitamin D checked?

Anyone with persistent, unexplained symptoms should ask about testing, but some groups are at higher risk of low vitamin D and may benefit from being checked even when they feel well:

When should you see a doctor?

See a doctor promptly if you have persistent bone pain, noticeable muscle weakness, difficulty walking or getting up, or a fracture after a minor fall or knock. These need proper assessment, as they can have causes other than vitamin D.

Book an appointment too if tiredness, aches or low mood have lasted more than a few weeks, or if you have been taking high-dose vitamin D and develop nausea, excessive thirst, frequent urination or confusion. In children, bowed legs, delayed growth or bone pain should always be checked by a doctor.

How we approach vitamin D at Shookra

At our clinic in Business Bay, vitamin D is rarely looked at in isolation. A doctor takes a full history, covering your routine, sun habits, diet, medicines and symptoms, then chooses the tests that fit. Low vitamin D often sits alongside other findings, such as low iron or thyroid changes, so it is usually measured as part of a wider panel, for example within a fatigue and energy assessment.

Results are reviewed with you in plain language, any treatment is matched to what they show, and a follow-up test confirms the change. Dr. Hassan Hamdan, our General Practitioner, can advise on testing and on what your results mean. This "measure first, then act" principle runs through our longevity care, as we explain in why we take a diagnostics-led approach to longevity.

Frequently asked questions

Can you get vitamin D through a window?

Very little. Ordinary window glass blocks most of the UVB light your skin needs to make vitamin D, so sitting in a sunny office, car or living room does not meaningfully raise your levels. UVA, which passes through glass more easily, can still contribute to pigmentation and skin ageing, so window sun offers some skin risk and little vitamin D benefit.

How long does it take to raise vitamin D levels?

It varies with your starting level, the dose your doctor recommends and how well you absorb it. Levels usually rise over several weeks to a few months, and doctors often repeat the blood test after around three months to check the response and adjust the dose.

Is it possible to take too much vitamin D?

Yes. Vitamin D is fat-soluble and stored in the body, so taking high doses for long periods can build up and raise calcium in the blood. This can cause nausea, thirst, confusion and kidney problems. Toxicity is uncommon at standard doses, which is why high-dose courses should be guided by testing.

Living well in the sun without running low

Low vitamin D in Dubai is less about a lack of sunshine and more about how we live with it: indoors, in cars, covered up and sensibly protected. You do not need to change that lifestyle to stay on top of your levels. You just need to know where you stand, and a blood test is the simplest way to find out.

If you have been feeling tired or achy, or you belong to one of the higher-risk groups, book a consultation with our team. We will help you understand your results and decide what, if anything, needs to change.