The Dark Season: Light, Vitamin D & Everyday Life

During the dark season, the sun sits too low in the sky in Central Europe from roughly October to March, so the skin produces barely any vitamin D - and staying well supplied becomes more of a challenge. Vitamin D contributes to the normal function of the immune system as well as to the maintenance of normal bones, teeth and muscle function. Daylight, a steady daily rhythm and movement are the simplest everyday levers; the right vitamin D dosage is best determined with your doctor based on your blood level.

Off to work in the dark in the morning, back home in the dark in the afternoon - and the desk in between. That is what winter looks like for many people. No wonder that quite a few things shift during this time: less daylight, more time indoors, and the body's own vitamin D production almost grinds to a halt. This guide shows you, soberly and practically, how to build light, rhythm and the "sunshine vitamin" cleverly into your winter routine. We deliberately stay cautious here: this is about everyday routines and the recognised function of vitamin D - not about promises regarding mood.

Why the dark season changes everyday life

Our body takes strong cues from light. The alternation of light and dark steers the internal clock and with it the day-night rhythm. In winter, less light reaches the retina, and we spend most of our time in rooms that are noticeably darker than outdoors even during the day. Many people then find it harder to get going in the morning - a common everyday observation. The practical starting point is simple: consciously bring more light into the day and keep the rhythm stable. Both cost nothing.

Bringing light and daylight into everyday life

Daylight is many times brighter than indoor lighting, even on an overcast winter day. Even a short time outdoors therefore makes a noticeable difference. Practical ideas:

• Get out in the morning: a short walk in the forenoon brings plenty of daylight to the eye - ideal on the way to work or during the lunch break.
• Outdoors rather than just by the window: window glass filters out a lot of light; spending time in the open air is considerably more effective.
• Make your workspace bright: desk close to the window, curtains fully open during the day.
• Fixed times: keeping wake-up and bedtimes as consistent as possible keeps the rhythm stable.

If you find it harder to wind down in the evening, you will find neutral everyday tips in Sleeping better naturally. How nutrients for nerves and less fatigue fit into the picture is shown in Spring fatigue & nutrients.

Movement as a building block

Movement is part of a healthy everyday life - especially when you spend a lot of time indoors in winter. The charm lies in the combination: anyone who moves outdoors gathers daylight and fresh air at the same time. It does not have to be an exercise programme; regular walks, cycling to work or taking the stairs instead of the lift already count. If you would also like to keep an eye on your nutrient supply for muscles and nerves, the overview in Energy: magnesium, iron & B vitamins will help.

Thought through practically, movement can be combined with the light building block: anyone who uses the lunch break for a brisk walk catches the brightest time of day and gets moving at the same time. For office workers who sit in front of a screen all day, this is often the only reliable portion of daylight - which makes the fixed habit all the more valuable. Further suggestions for the desk-bound day are collected in Nutrients for the office and screen.

Vitamin D during the dark season

Vitamin D plays a special role because the body normally produces most of it itself through the skin - with the help of sunlight when the sun is high enough. In Central Europe the sun sits too low from roughly October to March, so the body's own production drops sharply. Vitamin D is hard to cover through diet alone, as only a few foods contain appreciable amounts (such as oily sea fish, egg yolk). It is recognised that: vitamin D contributes to the normal function of the immune system, to the maintenance of normal bones and teeth as well as to normal muscle function and supports the normal absorption and utilisation of calcium.

How to interpret your level and choose the dosage is explained in detail in Vitamin D dosage: blood level & winter. Vitamin D3 is often combined with K2 - the background is in Combining vitamin D3 and K2. How vitamin D interacts with vitamin C and zinc in the immune context can be read in Immune system: vitamin C, D and zinc. Whether D3 or D2 is clarified in Vitamin D3 vs. D2.

What research is investigating

The functions of vitamin D for the immune system, bones, teeth and muscles are well established - hence the authorised statements. Beyond that, research is investigating how sharply the vitamin D supply actually drops during the winter half-year at our latitudes and which factors (skin type, age, time spent outdoors) influence the body's own production. Because the results vary from person to person, your personal blood level remains the most meaningful instrument - blanket figures are misleading here.

Eating in winter: nutrients from the ground up

Even if vitamin D takes centre stage in winter, it is worth looking at the entire nutritional foundation. Seasonal winter vegetables such as cabbage, root vegetables, leek and lamb's lettuce are rich in vitamins and secondary plant compounds. Wholegrain products, pulses, nuts and seeds provide B vitamins, magnesium, zinc and iron. Some have recognised contributions: B vitamins and magnesium contribute to a normal energy metabolism and to the reduction of tiredness, iron to normal oxygen transport. Anyone eating a vegetarian or vegan diet keeps an eye on critical nutrients - orientation is offered by Nutrients for vegans and, specifically on iron, Iron: how long until it takes effect?. In this way, diet forms the foundation on which targeted supplements such as vitamin D build.

A nice side effect of winter cooking: warming stews, roasted vegetables and soups made from seasonal ingredients provide not only nutrients but also do the sense of well-being good in the cold, dark season. Anyone who also thinks of the immune system will find the right building blocks in Immune system: vitamin C, D and zinc. And anyone who often feels tired during this time looks at their supply of iron and B vitamins, which contribute to a normal energy metabolism.

Which form and format of vitamin D suits you?

With supplements you will usually come across vitamin D3 (the form the skin also produces) and, less often, D2 - the difference is explained in Vitamin D3 vs. D2. When it comes to the format, you have the choice:

Because vitamin D is fat-soluble, you take it best with a meal that contains some fat. Which format is more suitable is compared in Vitamin D: drops or capsules?; what to look for in terms of quality is set out in Vitamin D supplement: recognising quality.

Fixed routines for the dark weeks

• Morning: open the curtains right after getting up and, if possible, step outside for a few minutes.
• Midday: use the brightest time of day for a short walk - even when it is overcast.
• Throughout the day: drink enough and make sure to move.
• Evening: wind down at as consistent a time as possible to keep the rhythm stable.
• Seasonal: think about your vitamin D supply during the winter half-year and have your status checked by a doctor if needed.

These routines are deliberately simple - their value lies in regularity. Also fitting for the immune system in autumn and winter are Building up the immune system in autumn and Strengthening the immune system in winter.

Honestly put: when you should seek medical advice

Feeling temporarily less energetic in winter is familiar to many. If, however, you feel persistently low, listless or heavily burdened over a longer period, that is a reason to have it clarified by a doctor or psychotherapist - there are good places to turn to for this. You should also seek medical advice before taking higher-dose vitamin D, during pregnancy, with existing conditions or when taking medication. This guide provides everyday information and does not replace individual advice.

Matching products from Scheunengut

For your supply during the dark months, you will find suitable supplements in the Vitamin D category - often as vitamin D3, on its own or combined with K2, as capsules, tablets or drops. If you would like to supplement more broadly, you will find further building blocks in Vitamins & minerals and Immune system. All products are made in Germany and lab-tested. A suitable dosage is best clarified with a doctor based on your vitamin D level.

Frequently asked questions (FAQ)

Why does the body produce barely any vitamin D in winter?

Vitamin D forms in the skin only when the sun is high enough. In Central Europe the sun's position is too low from roughly October to March, so the body's own production drops sharply. Vitamin D is hard to cover through diet, as only a few foods such as oily sea fish or egg yolk contain appreciable amounts - which is why staying well supplied becomes an issue in winter.

How do I find the right vitamin D dosage in winter?

The most meaningful measure is your individual status, which you can have determined by a doctor via the blood level (25-OH vitamin D). On this basis the right dosage can be set. Blanket recommendations are misleading, because the requirement varies depending on skin type, age and time spent outdoors. Our guide "Vitamin D dosage: blood level & winter" goes into this in detail.

Does daylight help against the winter slump?

Daylight is a simple, free building block for the winter day: even on overcast days it is many times brighter outdoors than indoors, and time in the open air supports a stable day-night rhythm. We deliberately make no promises regarding mood. If you feel persistently low over a longer period, you should seek medical or psychotherapeutic advice.

Is it enough to eat more oily fish in winter?

Oily sea fish is one of the few foods with an appreciable vitamin D content, but the requirement is usually hard to cover through diet alone in winter. A varied winter cuisine with vegetables, wholegrains, pulses and nuts provides many other nutrients and forms the foundation - targeted supplements such as vitamin D build on top of it, guided by your personal blood level.