Vitamin D in winter: Recognize the need and supplement correctly

Hardly any micronutrient is discussed as often in autumn and winter as vitamin D. The sun appears less frequently, the days become shorter – and many suddenly notice that they feel more tired and less energetic than during the summer months. A good reason to take a closer look: Why does the body actually need vitamin D, how can an increased requirement be recognized, who should be particularly attentive, and what role can dietary supplements play in a meaningful way?

Overview hide

Why vitamin D plays a special role

Signs that may indicate a possible increased need

What certain groups should pay particular attention to

Supplements as a meaningful addition, not as a replacement

Small daily routines with big effects

Common Questions About Vitamin D

Why vitamin D plays a special role

Vitamin D contributes, according to approved EU health claims, to a normal function of the immune system as well as to the maintenance of normal bone and muscle function. These functions occur constantly in the background, which is why a noticeable deficiency often only becomes apparent after a longer period – and usually more gradually than suddenly. Unlike most vitamins, the body can produce Vitamin D itself through the skin using sunlight. However, in countries like Germany, sunlight exposure from October to March is often insufficient to meet this need solely through self-production. People who spend a lot of time indoors, consistently use sun protection, or have a darker skin type are particularly affected by this seasonal gap.

Through a classic diet, the requirement can only be difficult to fully compensate for: fatty fish, egg yolks, or fortified foods do provide Vitamin D, but usually in amounts that are relatively small compared to the actual need during the darker months.

Signs that may indicate a possible increased need

Not every form of fatigue is automatically related to the vitamin D level – there are many possible causes, from lack of sleep to stress. Nevertheless, many people report during the winter months:

Clearly lower energy levels throughout the day
A generally more subdued mood
The feeling of being unable to concentrate as well

It is important to note: Not every person automatically needs additional supplements. Whether there is actually a deficiency or an increased need can be most reliably assessed through a blood test with a doctor or in consultation with medical professionals – individual factors such as place of residence, skin type, and lifestyle play a major role.

Tip: People who are often active outdoors can support their body’s natural vitamin D production – a walk in the midday sun often has a greater effect than one might initially think.

What certain groups should pay particular attention to

The individual requirement can vary significantly. People who mainly follow a plant-based diet, older people with generally thinner skin, and individuals who rarely go outside for health reasons are considered groups in which an increased need is more likely to occur. Anyone who regularly takes medication should generally discuss a possible dietary supplement with a doctor or pharmacist in advance, as certain active ingredients can influence each other.

This does not mean that these groups automatically require a supplement – but rather that occasional monitoring of values can be particularly worthwhile for them before adding anything on their own. Pregnant and breastfeeding women also belong to the groups for whom a medical assessment of individual needs is meaningful, as the nutrient requirements change completely during this life phase.

Supplements as a meaningful addition, not as a replacement

If an increased need is identified after consulting a doctor, high-quality preparations can be a practical addition to everyday life. Providers like BIOGENA have specialized in well-thought-out micronutrient formulations and offer with their vitamin D supplements a way to specifically support individual nutrition. The correct dosage remains crucial, which is best determined together with a doctor or a nutritionist, rather than self-medicating with high doses.

In supplements, Vitamin D3 (Cholecalciferol) is most commonly found, which is the most similar to the body’s own Vitamin D and tends to be absorbed more reliably in studies than the plant-based variant D2 (Ergocalciferol). For people who want to consciously follow a vegan diet, there are now D3 variants derived from lichens as an alternative to animal sources such as lanolin.

Those who generally want to engage more with the topic of micronutrients will find many practical starting points for everyday life in our article on healthy nutrition in conversation with a nutrition consultant.

Small daily routines with big effects

Alongside targeted supplementation, it makes sense to make everyday life more vitamin-friendly overall. A colorful, varied diet rich in fresh fruit and vegetables not only provides small amounts of vitamin D, but also numerous other micronutrients that can positively affect general well-being in combination. Our green smoothie recipes or the berry smoothies with blueberry and raspberry are excellent for incorporating more vitamins effortlessly into your day.

Exercise outdoors also pays off in two ways: it supports the body’s own vitamin D production and has an additional positive effect on sleep and overall energy levels. Those who are already thinking about home workouts in winter can specifically combine them with short outdoor sessions at noon, instead of completely moving indoors.

Plan regular time in daylight whenever possible
Consciously include fatty fish and egg yolks in your meal plan
Have blood tests to check vitamin D levels if fatigue persists
Take supplements only after consulting a healthcare professional and in the recommended dosage

This creates a routine that is not based on a single measure, but rather connects several small building blocks meaningfully – adapted to your own life situation and individual needs.

Common Questions About Vitamin D

Does everyone really need a vitamin D supplement in winter? No, the need is very individual. The most reliable way to determine an actual increased need is through a blood test.

Can I cover my vitamin D needs through diet alone? In the darker months, this is usually only limited through normal food, as the amounts in typical foods are limited.

How do I find the right dosage? Best together with a doctor or a nutritionist, based on individual blood values and personal life situation.

Are there certain groups of people who should be especially careful? Anyone who regularly takes medication or has a pre-existing condition should generally consult a doctor or pharmacist before taking a dietary supplement.