Zeit für Vitamin D

Das Multitalent: Vitamin D ist wichtig für unsere Gesundheit und das Immunsystem sowie unsere Stimmung - aber wir bekommen selten genug davon.


Sonnenlicht ist die beste natürliche Quelle von Vitamin D. Im Herbst und Winter, wenn die Tage kürzer werden und die Sonne uns seltener erfreut, ist es umso wichtiger sich um seinen Vitamin D Haushalt zu kümmern. Genügend Vitamin D über die Nahrung aufzunehmen ist fast nicht möglich, insbesondere für Menschen mit einem veganen oder vegetarischen Lebensstil: die besten Quellen des wichtigen Vitamin D3 sind fettiger/öliger Fisch, Leber, Eier sowie Käse und Butter, die besten Quellen für Vitamin D2 sind Pilze und Avocado. Ohne tägliche ungeschützte Zeit in der Sonne (d.h. ohne Sonnencreme/schutz, was wiederum für die Haut problematisch sein kann) ist daher kontinuierliche Ergänzung mit einem Vitamin D Präparat zu empfehlen.

Vitamin D trägt zur Erhaltung normaler Knochen, normaler Zähne sowie zu einer normalen Funktion des Immunsystems bei. Es übernimmt eine Funktion bei der Zellteilung und wird für ein gesundes Wachstum und eine gesunde Entwicklung der Knochen bei Kindern benötigt. Außerdem trägt Vitamin D zu einer normalen Muskelfunktion, einem normalen Calciumspiegel im Blut sowie einer normalen Aufnahme/Verwertung von Calcium und Phosphor bei. Für die Wichtigkeit von Vitamin D3 und die Unterscheidung zwischen D3 und D2 empfehlen wir unseren Blog zum Thema über diesen Link. 


Anbei eine gute Zusammenfassung unserer Partner von BioCare in englischer Sprache zum Thema Vitamin D mit besonderem Fokus auf das Immunsystem unter them Titel "Combat the winter blues, colds and flus with vitamin D":




Vitamin D is one of the most important vitamins that our body needs to function optimally. Vitamin D is best-known for its bone supporting function whereby it plays an important role in enhancing the absorption of calcium and phosphorus. Other important roles of vitamin D include regulating our insulin production for optimum blood sugar balance, enhancing immunity, supporting cardiovascular health and regulating our mood. Despite its importance, vitamin D deficiency is unfortunately very common, particularly within the UK population but also across the rest of Northern Europe, including Switzerland (see below from EDI). This is mainly due to our lack of sunlight exposure (which is our main source of vitamin D) along with a low intake through the diet. Other factors which further contribute towards low vitamin D levels include old age, pregnancy and breastfeeding, dark or covered skin, sunscreen use, obesity and the intake of certain medications such as metformin.




As we are now approaching winter where our exposure to sunlight will be very limited, it is important to ensure that our vitamin D levels are kept within optimum levels. This is particularly important as vitamin D can enhance our immune response against various infections which are more common during winter such as tuberculosis, influenza and viral upper respiratory tract infections.[1] It is also supportive of mental health conditions such as Seasonal Affective Disorders (SAD) and depression, whereby vitamin D supplementation portrayed effectiveness in reducing depressive symptoms in SAD patients.[2] It is suggested that vitamin D may enhance serotonin production hence its mood-enhancing effects.[3] Due to the Western diet and an indoor lifestyle, it is becoming harder for us to maintain adequate levels of vitamin D in our body. Food sources of vitamin D include oily fish, such as salmon, mackerel and sardines, eggs and raw milk. However, due to the increase of fish and poultry farming, vitamin D levels in these sources are lower than expected. For example, farmed salmon was found to have approximately 75% less vitamin D in comparison to wild salmon.[4] Therefore, a vitamin D supplement is essentially the best way of ensuring that we get our daily dose of vitamin D.




The UK Department of Health have always recommended adults over 65 years, pregnant and breastfeeding women, babies and children to supplement with 10 micrograms (400 IU) of vitamin D, especially if the infant is breastfed or if receiving less than 500ml of suitably fortified formula milk. However, more recent recommendations (2016) have advised that everyone in the UK should supplement with vitamin D during autumn and winter, and all year round for those with limited sunlight exposure even during summer such as those who cover up for religious reasons or individuals with an indoor, sedentary lifestyle e.g. working in an office. For Switzerland, we refer to the recommendations of the EDI below! Where there is a deficiency, individuals will require significantly larger doses of vitamin D of around 2000-4000 IU administered for at least 3 months and levels then retested. Obese individuals, patients with malabsorption syndromes, and patients on glucocorticoids, anti-seizure and AIDS medications may require higher doses of vitamin D (up to 2-3 times higher – at least 6000–10 000 IU/day). We recommend that you get your serum vitamin D levels tested before taking high doses of vitamin D. 


Vitamin D is a fat soluble vitamin, so individuals with compromised digestion or difficulty digesting fat may not be able to absorb and metabolise vitamin D well. It is important for these individuals to select an emulsified (pre-digested) version of vitamin D to ensure optimal absorption.


We strongly recommend that you include vitamin D as part of your winter supplement protocol this year. For adults and children we offer BioCare Bio-D Vitamin D3 in a practical liquid solution. For children, an alternative would be our BioCare Red Berry BioMelts, which provide Vitamin D3 in combination with 3 billion beneficial bacteria delivered in a great tasting powder in individual sachets which your kids will love.


Got a question? The brand you can talk to:

We have a team of Clinical Nutritionists at the end of our advice line, open to you, for product support and advice (5 days a week). 0121 433 8702 or clinicalnutrition@biocare.co.uk. Or send an e-mail to info@nourishme.ch

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