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The post is the personal opinion of the author and not necessarily that of Nutrizzia d.o.o., the owner of this website. The author made the research and conclusions based on his own and general knowledge, unless otherwise stated in the text below.

Tanja Avsec Faganel

Why winter might make vitamin D3 supplements necessary



Winter sunset

As winter approaches, sunlight decreases, and many people find it challenging to get enough vitamin D3 from natural sources alone. Vitamin D3 is a crucial nutrient we primarily absorb from sun exposure, but in the darker, colder months, supplements become an important option. Among these, cod liver oil stands out as a natural source of vitamin D3, also offering additional health benefits.



Why Vitamin D is Harder to Obtain in Winter?

Our primary source of vitamin D is sunlight exposure, which prompts our skin to produce vitamin D3. During winter, however, this process is often disrupted by:


  1. Shorter days and weaker sunlight: Winter sunlight is less intense and at a lower angle, particularly in regions far from the equator, which makes UVB rays—necessary for vitamin D production—less available.

  2. More time indoors: Colder temperatures and shorter days mean we spend more time indoors, reducing our sun exposure further.

  3. Heavier clothing: When we do go outside, winter clothing usually covers much of our skin, which also blocks UV rays.


For these reasons, vitamin D deficiency is particularly common in winter, especially in northern climates.



The benefits of cod liver oil as a vitamin D3 supplement

Cod liver oil is a natural supplement that provides not only vitamin D3 but also other beneficial nutrients, such as omega-3 fatty acids and vitamin A. This natural option is a valuable way to bridge the seasonal gap, ensuring your body gets the support it needs Here’s why it can be an excellent choice for winter:


  • Bone health: Vitamin D3 helps the body absorb calcium effectively, which is essential for strong bones. This is particularly important in winter, as low vitamin D can lead to weakened bones over time.

  • Immunity boost: Adequate vitamin D levels reduce the risk of respiratory infections, which is crucial in winter when colds, flu, and other respiratory illnesses are more common.

  • Mood improvement: Studies show that vitamin D supplementation can improve mood, especially for those with SAD, a condition linked to reduced sunlight exposure.

  • Omega-3 and inflammation reduction: Cod liver oil’s omega-3 fatty acids further support joint health and may reduce inflammation, easing winter aches and pains.


Cod liver oil provides a natural and effective source, recommended for inclusion in your routine alongside a balanced diet and, where possible, exposure to sunlight.



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