Vitamin D deficiency is one of the most common deficiencies in the Netherlands. Limited sunlight hours, especially in winter, leave much of the population with low levels.
Why vitamin D matters
Vitamin D (technically a hormone) is essential for calcium absorption, bone health, immune function, muscle function and mood.
Symptoms
Fatigue, muscle weakness/pain, bone pain, low mood, frequent illness, slow wound healing and hair loss (in severe cases).
Normal values (nmol/L)
Above 75: optimal. 50-75: sufficient. 30-50: insufficient. Below 30: deficient.
Risk groups
Everyone in the Netherlands (October-April), people with darker skin, elderly, those who spend little time outdoors, people with overweight.
Frequently asked questions
When is the best time to test?
End of winter (February-March) when levels are lowest and most informative.
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