Vitamin D in autumn and winter: supplement with care

neotes Editorial Team Oct 12, 2026

Vitamin D im Herbst und Winter: bewusst ergänzen

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You leave for work in the dark, spend the afternoon indoors and save your walk for the weekend. As the days become shorter, vitamin D production in the skin also changes. Whether a supplement is useful depends on your personal supply. At neotes, we explain what matters and how to make a considered product choice.

Less sun changes the initial situation

The body can produce vitamin D with the help of UVB radiation. In Germany, sunlight is usually insufficient for this from October to March. Stores built up during sunnier months can, however, contribute to supply in winter. The amount available differs from person to person. [1]

A single winter month therefore says little about your personal vitamin D status. Time spent outdoors, skin type, age and diet are all part of the overall picture. Looking at your daily routine provides a better basis for a decision than looking at the calendar alone.

A short walk during your lunch break remains a good way to add movement to your day. You should still use appropriate sun protection outdoors; using a sunbed is not recommended as a way to improve vitamin D supply. [2]

What vitamin D means for the body

Vitamin D contributes to the maintenance of normal bones and the normal function of the immune system. These functions explain why an adequate supply matters. They do not, however, mean that an ever-higher intake provides additional benefit. According to the German Federal Institute for Risk Assessment, additional intake generally offers no health benefit when vitamin D status is already adequate. [2]

A practical question can help with the decision: is there a reason in your situation to supplement your supply specifically? People who spend very little time outdoors or whose skin remains largely covered should pay particular attention. The body’s own production can also decline with age. [3]

Clarify three things before choosing a product

1. Which sources are already available?

Oily fish such as salmon, herring and mackerel provides vitamin D. Smaller amounts are found in foods such as egg yolk. Also check the labels of supplements you already use: a multivitamin, daily supplement box or other combination product may already contain vitamin D. Your total intake is what matters. [3]

2. Is there a reason for a medical classification?

A blood test can be useful when there is a specific reason for it. The usual measurement is 25-hydroxyvitamin D, abbreviated to 25(OH)D. This does not mean that healthy adults automatically need routine testing. Whether a measurement is appropriate and how an existing result should be interpreted can be clarified with a healthcare professional. [3]

3. Which amount suits the individual situation?

For adults with no endogenous vitamin D production, the German Nutrition Society gives an estimated value of 20 µg of vitamin D per day. This value describes an adequate intake under that condition. It is not a blanket recommendation to take the same amount as a supplement in addition to your existing intake. [1]

A clear recipe: neotes vitamin D3 oil

If you would like to supplement your intake in a targeted way and have clarified the appropriate amount, the dosage form can make everyday use easier. Our Vitamin D3 Oil contains cholecalciferol from lanolin in coconut-derived MCT oil. The formula consists of these two ingredients. It is suitable for vegetarians; the vitamin D3 source is of animal origin.

The daily serving stated on the product page is one drop, providing 25 µg of vitamin D3, equivalent to 1,000 IU. According to the directions, the drop can be taken directly or added to food or a drink. The oil-based form is a practical option for people who prefer drops to capsules.

For your comparison: the daily serving of 25 µg is above the German Federal Institute for Risk Assessment’s proposed maximum of 20 µg per daily serving of a food supplement. This is a recommendation for product composition. Check whether the dosage suits your needs and your other sources of vitamin D. [2]

Vitamin D3 oil: ingredients and daily portion view

Understand upper limits correctly

EFSA has set a tolerable upper intake level of 100 µg of vitamin D per day for adults from all food sources, including supplements. It is used for safety assessment. It is not an intake target and does not indicate how much additional vitamin D you personally need. [4]

Follow the product instructions and take any supplements you already use into account. If you take medication, have an existing medical condition or are being treated for a diagnosed deficiency, discuss your choice with your healthcare provider. [3]

A manageable step for the cold season

For autumn and winter, start with an overview of the time you spend outdoors, your diet, the supplements you already use and, where applicable, a result assessed by a healthcare professional. A supplement can then be added to an existing routine if it is genuinely appropriate. A regular point in your day, such as breakfast, can help you keep to the agreed use.

neotes vitamin D3 oil in detail get to know

Dietary supplements are not a substitute for a balanced and varied diet or a healthy lifestyle. The recommended daily consumption amount must not be exceeded. Keep out of the reach of small children.