We live too far north to get enough vitamin D from the sun for half the year. The result is a deficiency that's widespread, low on symptoms, and easy to fix once you know your number.
Reading time 4 min · Updated May 2026 · Aevia Insights
- A large share of Danes have low vitamin D, particularly October–March.
- Deficiency can affect energy, immunity, mood and bones.
- The symptoms are vague, measurement is the only reliable route.
- Supplements are cheap and effective, but the dose should be matched to your level.
Why are so many deficient?
Vitamin D is produced in the skin from sunlight. At Danish latitudes the sun is too weak from autumn to spring, and indoor work compounds the problem.
What deficiency means
Low vitamin D is associated with fatigue, weakened immunity, poorer bone health and possibly mood effects. It's rarely dramatic, but it wears on you.
Measure rather than guess
Your need for supplements depends on your current level. A blood test tells you whether you're deficient, and how much you should supplement, instead of taking a random dose.
Frequently asked questions
Can I just take a supplement to be safe?
A moderate supplement is safe for most people in winter, but a measurement ensures you get it right, neither too little nor too much.
Is vitamin D included at Aevia?
Yes, as part of the vitamin and mineral panel (deficiency check).
This article is general information and does not replace individual medical advice.