Vitamin d deficiency rarely announces itself. A patient may attend for an annual check-up or a follow-up on an unrelated concern, and the blood report shows a vitamin D level well under the reference range. In the UAE this is a routine finding rather than an unusual one, and it affects Emiratis and expatriates, men and women, children and older adults alike.
A shortage of the “sunshine vitamin” in one of the sunniest cities in the world may seem contradictory, but there are clear reasons behind it. The sections below cover the symptoms to be aware of, why the problem is so widespread in Dubai, and what testing and treatment involve.
The Role of Vitamin D in the Body
Strictly speaking, vitamin D behaves more like a hormone than a typical vitamin. The skin produces it in response to ultraviolet B (UVB) light, after which the liver and kidneys convert it into an active form. Food and supplements contribute a smaller share.
Its best-known job is regulating calcium. Without adequate vitamin D, the intestine absorbs only a fraction of the calcium in the diet, and the body starts drawing on the reserves held in bone. Vitamin D receptors are also found in muscle and immune cells, which helps explain why a long-standing shortfall can affect strength, recovery and resistance to infection, not just the skeleton.
Common Symptoms of Low Vitamin D
Many people with low levels feel entirely well. When vitamin d symptoms do appear, they build slowly, and patients often put them down to work pressure, poor sleep or simply getting older.
Fatigue is the complaint physicians hear most, usually described as tiredness that lingers despite a full night’s rest. Other signs include:
- a dull ache in the bones, often in the lower back, pelvis or legs
- muscle weakness or cramping, sometimes noticed when climbing stairs or rising from a chair
- recurrent colds and chest infections
- cuts and wounds that are slow to heal
- increased hair shedding
- low mood, particularly over a prolonged period
Where the shortfall is severe and long-standing, bones may lose mineral and soften. Adults can develop osteomalacia, which raises the likelihood of fractures, while children are at risk of rickets and impaired growth.
Thyroid disease, anaemia and several other conditions can present in much the same way. For that reason, vitamin D symptoms alone are not enough to make a diagnosis; a blood test is needed.
Why Low Vitamin D Is Common in Dubai
Sunshine is plentiful in Dubai, but the conditions for turning it into vitamin D are not. Between May and October in particular, daytime heat pushes most activity indoors. A typical working day might move from an air-conditioned apartment to a covered car park, a vehicle with tinted windows and an office tower, with very little direct sun at any point. Outdoor exercise tends to be left until evening, by which time UVB levels are too low to be useful.
Clothing is a further factor. Many residents, for cultural, religious or personal reasons, wear garments that leave little skin uncovered. Those who spend more time outdoors are rightly encouraged to use sunscreen, yet a high-SPF product also blocks much of the UVB the skin needs. Skin tone matters as well. Higher melanin content slows production, so people with darker skin need considerably longer in the sun to achieve the same result.
Diet seldom makes up the difference. Oily fish, egg yolks and fortified foods are the principal sources, and few people eat them in sufficient quantity. Taken together, these factors account for the high rates of vitamin d deficiency documented in research from the UAE and neighbouring Gulf states.
Groups at Higher Risk
Low vitamin D can affect anyone in Dubai, though physicians pay particular attention to the following groups:
- pregnant and breastfeeding women, whose requirements are higher
- infants who are exclusively breastfed, as breast milk contains relatively little vitamin D
- adults over 60, since the skin’s capacity to produce vitamin D declines with age
- people with obesity, in whom vitamin D tends to be stored in fat tissue rather than circulating
- office workers, students and others who spend most of the day indoors
- patients with coeliac disease, Crohn’s disease or a history of bariatric surgery, all of which can reduce absorption
- those with chronic kidney or liver disease
- people on long-term medication such as certain anticonvulsants or corticosteroids
For anyone in these categories, a vitamin D test is a reasonable request at the next routine appointment, whether or not symptoms are present.
Vitamin D Testing in Dubai
The standard investigation is the 25-hydroxyvitamin D test, abbreviated as 25(OH)D. It reflects the body’s vitamin D stores over the preceding weeks and is the measure most laboratories and clinical guidelines rely on.
In Dubai, the test is offered by most clinics, hospitals and independent laboratories. It involves a routine blood draw from the arm, and fasting is not normally required unless it is combined with tests such as fasting glucose or a lipid profile. Results are generally returned within one to two working days.
Laboratories report results in either ng/mL or nmol/L. Exact thresholds differ slightly between laboratories; the ranges below are those most commonly applied.
| Level (ng/mL) | Level (nmol/L) | Interpretation |
| Below 20 | Below 50 | Deficient |
| 20 to 29 | 50 to 74 | Insufficient |
| 30 to 100 | 75 to 250 | Sufficient |
| Above 100 | Above 250 | Potentially excessive |
A result should always be read in context. The treating physician will consider age, symptoms, medical history and any other findings before confirming vitamin d deficiency and deciding whether treatment is required.
Treatment Options
In most cases, vitamin d deficiency treatment is simple, inexpensive and highly effective. The mainstay is a vitamin D3 (cholecalciferol) supplement, prescribed as a daily tablet, a weekly capsule or, for young children, oral drops. The dose is set according to the blood result, body weight and any coexisting conditions. Where levels are markedly low, a physician will often begin with a higher corrective course over six to eight weeks before moving the patient onto a lower maintenance dose.
Calcium may be added if dietary intake is poor or there is evidence of reduced bone density. A repeat 25(OH)D test, usually around three months after starting treatment, confirms whether levels have recovered and allows the dose to be fine-tuned.
High-strength vitamin D products are easy to buy online and over the counter, which makes self-medication tempting. Taking large doses for extended periods without supervision can cause hypercalcaemia, a build-up of calcium in the blood linked to nausea, kidney stones and heart rhythm disturbances. Supplements should be taken only at the dose a doctor recommends.
Maintaining Healthy Vitamin D Levels
Restoring vitamin D is only half the task. Keeping it within range calls for some ongoing attention.
The cooler months, roughly November to March, are the best time to build regular outdoor activity into the week, and even brief periods with the forearms and lower legs uncovered make a worthwhile contribution. In summer, an early-morning walk is a far more practical option than anything later in the day.
Salmon, sardines, mackerel, eggs and fortified milk, yoghurt or cereals are all worth including regularly. Many residents, especially those whose work keeps them indoors, will also be advised to continue a low-dose maintenance supplement. For anyone who has been deficient before, an annual blood test is a sensible way to catch any decline early.
When to Consult a Doctor
Persistent tiredness, unexplained bone or muscle pain and frequent infections all warrant a medical review, as does belonging to any of the higher-risk groups described above. A general physician is well placed to take a full history, order the appropriate tests, exclude other causes and agree on a treatment plan.
For residents of International City and the surrounding communities, convenience counts. An Affordable General Physician International City Dubai with laboratory facilities on site allows consultation, blood collection and follow-up to take place at a single location. A clinic that provides Medical & Dental Services in Dubai can also simplify routine care for the whole family.
Frequently Asked Questions
Why is low vitamin D so common in Dubai when there is so much sun?
The skin can only make vitamin D when sunlight reaches it directly. Long hours indoors, covering clothing and regular sunscreen use all limit that exposure, regardless of how sunny the climate is.
What vitamin d symptoms should prompt a test?
Ongoing fatigue, bone or back pain, muscle weakness and frequent infections are the most common reasons people are tested. Many patients have no symptoms at all, so routine screening is also worthwhile for higher-risk groups.
Do I need to fast before a vitamin D blood test?
Not usually. The 25(OH)D test can be taken at any time of day. Fasting may be requested if it is being done alongside tests such as blood glucose or cholesterol.
How long does vitamin d deficiency treatment take to work?
Blood levels generally recover within two to three months of consistent supplementation. Improvements in energy and muscle comfort are often noticed within the first few weeks.
Is sunlight alone enough to correct low vitamin D?
For a mild shortfall, additional time outdoors may help. A confirmed deficiency, however, usually needs supplementation first, followed by a combination of sun exposure, diet and a maintenance dose.
Can vitamin D supplements cause harm?
Yes, if taken in high doses for long periods. Excess vitamin D can raise blood calcium and lead to complications, which is why supplements should follow a doctor’s prescription.
Can children develop vitamin d deficiency?
They can. Breastfed infants and children who spend little time outdoors are most at risk, and low levels in childhood can affect bone growth. A paediatrician can advise on suitable drops or supplements.
