TL;DR
Low vitamin D status is common in Greece and across Southern Europe, especially outside the summer months.
Most adults use 1000 to 4000 IU per day, depending on baseline status, skin tone, sun exposure and body weight. 4000 IU (100 µg) per day is the EFSA upper limit for adults. Testing before higher doses is advisable.
Greece receives abundant sunlight, which leads many people to assume vitamin D deficiency is not a concern. The reality is different. Studies in Greek adults show high rates of insufficiency, particularly in winter and in people with higher body weight or regular sunscreen use.
Why low vitamin D is common in Greece
- Most people spend limited time outdoors with sufficient skin exposure
- Sun avoidance and sunscreen use reduce synthesis
- Dietary sources of vitamin D are limited
- Skin pigmentation, age and body weight affect vitamin D status
Common doses by context
| Context | Common daily dose | Notes |
|---|---|---|
| Maintenance (sufficient baseline) | 800 to 1000 IU | General adult population |
| Correction of insufficiency | 2000 to 4000 IU | Ideally guided by a blood test and retest |
| Above 4000 IU | Only on medical advice | 4000 IU is the EFSA upper limit for adults |
Vitamin D3 vs D2
Vitamin D3 (cholecalciferol) is the preferred form for supplementation as it raises serum 25 OH D levels more effectively than D2.
When to test
A 25 OH D blood test provides accurate status information. Testing in late winter or early spring, when levels are typically at their lowest, gives the most representative reading. Under the Endocrine Society definitions, a result below 30 ng/mL indicates insufficiency and below 20 ng/mL indicates deficiency.
Many Greek adults have low vitamin D outside summer. A blood test is the simplest way to know your starting point before taking higher doses.
FAQ
How much vitamin D should adults in Greece take?
Many adults use 1000 to 2000 IU per day for maintenance, or 2000 to 4000 IU to correct insufficiency, ideally guided by a blood test. 4000 IU per day is the EFSA upper limit for adults.
Is vitamin D deficiency common in Greece?
Yes. Despite the sunny climate, studies show high rates of insufficiency in Greek adults, especially in winter, due to indoor lifestyles, sun avoidance and diet.
Should I take vitamin D3 or D2?
Vitamin D3 is preferred as it raises blood levels more effectively than D2.
Bottom line
Low vitamin D is widespread in Greece. For most adults, 1000 to 4000 IU of D3 daily is a practical range, staying within the EFSA upper limit. A blood test gives clarity on the right individual dose.
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