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Vitamin D and tiredness
Low levels are common at these latitudes, but D is rarely the whole story on its own.
Vitamin D deficiency is real and common in Northern Europe — the sun angle cannot make D in the skin from roughly October to March — and it causes tiredness, muscle aches and low mood. But it is also over-blamed: D is often low alongside whatever is actually wrong, and fixing it while ignoring sleep, iron and mood changes nothing.
The check is a 25-hydroxyvitamin D blood test, best taken at the end of winter when stores are lowest. If it is low, the national guidance dose is boringly standard — typically 20-50 micrograms a day for a few months, then a maintenance dose. There is no evidence that huge doses beyond correction do anything extra.
Zuerst prüfen
A 25-hydroxyvitamin D test at the end of winter.
Nachschlagewerk, kein medizinischer Rat. Wenn Müdigkeit fortschreitet, unerklärt ist oder mit Gewichtsverlust, Fieber, Nachtschweiß oder Atemnot kommt, sehen Sie einen Arzt. Hier wird nichts diagnostiziert.