DE Europe | en English
Shipping to
DE Europe
  • CHSwitzerland
  • DEEurope
  • UKUnited Kingdom
  • USUnited States
  • OTOther
en English
  • enEnglish
  • deDeutsch

Swiss Made

Fast shipping


Swiss Made

Fast Shipping



Vitamin D3: the sunshine vitamin for good health

Vitamin D3, also known as the “sun vitamin”, is an essential nutrient for our health. In recent years, this vitamin has become increasingly important as its many functions in the body have become better understood. But what exactly is vitamin D3 and why is it so important for our bodies? In this article, we’ll take an in-depth look at this fascinating vitamin and find out how you can ensure your body is getting enough of it to support optimal health.

The significance of vitamin D3

Vitamin D3, also known as Cholecalciferol, is a fat-soluble vitamin essential for bodily health. It is primarily synthesized through sunlight exposure on the skin but can also be obtained through certain foods and supplements. The primary function of Vitamin D3 is to promote the absorption of calcium and phosphorus in the intestines, crucial for maintaining strong bones and teeth. Additionally, it plays a significant role in regulating the immune system, cell division, muscle strength, and inflammation processes in the body. A deficiency in Vitamin D3 can lead to various health issues, including osteoporosis, muscle weakness, depressive mood, and a weakened immune system. Therefore, it’s important to ensure you have adequate levels of this vital vitamin to promote your health and well-being.

Soak up vitamin D from the sun

Why is vitamin D3 important?

Vitamin D3 is an essential vitamin that fulfills a variety of important functions in the body. Its significance extends across various aspects of health and well-being:

  • Bone Health: Vitamin D3 plays a crucial role in the absorption of calcium and phosphate, which is essential for bone health and the prevention of osteoporosis and rickets.
  • Immune Function: It has been found that Vitamin D3 plays an important role in regulating the immune system. Adequate levels of Vitamin D3 can help strengthen the body’s defenses and reduce the risk of infections.
  • Anti-inflammatory Properties: Vitamin D3 possesses anti-inflammatory properties that can help reduce inflammation in the body and decrease the risk of chronic diseases.
  • Mood and Well-being: Maintaining adequate levels of Vitamin D3 can positively impact mood and reduce the risk of depression and seasonal affective disorder.
  • Cardiovascular Health: Studies suggest that sufficient levels of Vitamin D3 may reduce the risk of cardiovascular diseases such as heart attack and stroke.
  • Diabetes Prevention: Some studies indicate that Vitamin D3 may play a role in preventing type 2 diabetes by improving insulin sensitivity and reducing inflammation associated with the disease.

The sources of vitamin D3

Vitamin D3 can be obtained from various sources, including:

Sunlight: The primary source of Vitamin D3 is sunlight exposure. When the skin is exposed to the UV-B rays of the sun, it produces Vitamin D3. The amount of Vitamin D3 produced depends on factors such as the season, time of day, geographic location, skin color, and use of sunscreen.

Supplements: Vitamin D3 supplements are a convenient way to meet the body’s need for this vitamin, especially in regions with limited sunlight exposure or in individuals at higher risk of Vitamin D deficiency. These supplements are available in various forms such as tablets, capsules, or drops.

Natural Food Sources: Some foods naturally contain Vitamin D3 or are fortified with it. These include fatty fish like salmon, mackerel, and tuna, egg yolks, cod liver oil, and mushrooms exposed to UV light. Here is a table showing some natural food sources of Vitamin D3:

FoodVitamin D3 Content per Serving*
Salmon (cooked, 85g)447 IU
Tuna (cooked, 85g)154 IU
Egg yolk (1 large egg)41 IU
Cod liver oil (1 tsp)448 IU
Shiitake mushrooms (cooked, 85g)3 IU
*Values provided may vary depending on preparation method and origin.

By combining sunlight exposure, supplements, and a balanced diet, you can ensure that your body is adequately supplied with Vitamin D3. However, it is important to regularly monitor Vitamin D3 levels and consult with a healthcare professional regarding optimal supplementation.

Vitamin D in Salmon

Vitamin D deficiency and symptoms

Causes of a Deficiency:

  1. Limited Sunlight Exposure: One of the primary sources of Vitamin D is sunlight exposure. Individuals living in regions with limited sunlight or spending little time outdoors may be more susceptible to Vitamin D deficiency.
  2. Dark Skin: People with darker skin produce less Vitamin D than those with lighter skin, as melanin can impair Vitamin D production in the skin.
  3. Lack of nutrition: A diet lacking in foods naturally rich in Vitamin D, such as fish, eggs, and mushrooms, can lead to a deficiency.
  4. Aging: Elderly individuals often have lower Vitamin D levels, as aging skin becomes less efficient at producing Vitamin D, and the kidneys may convert Vitamin D less effectively into its active form.
  5. Obesity: Obesity can lead to lower Vitamin D levels, as Vitamin D may be stored in fat tissue, making less available in the bloodstream.
  6. Certain Medical Conditions: Some medical conditions like celiac disease, Crohn’s disease, and kidney disorders can impair Vitamin D absorption in the body, leading to a deficiency.
  7. Medications: Certain medications such as corticosteroids, anticonvulsants, and certain cancer drugs can interfere with Vitamin D absorption in the body, resulting in a deficiency.

It’s important to recognize the causes of Vitamin D deficiency to take appropriate measures for treatment and prevention. If you suspect a Vitamin D deficiency, it’s best to consult a doctor who can assist with diagnosis and treatment.

Symptoms and Consequences of Deficiency:

  1. Fatigue and Exhaustion: Persistent fatigue and a general feeling of exhaustion, even after adequate sleep, are common symptoms of Vitamin D deficiency.
  2. Muscle and Joint Pain: Vitamin D deficiency can lead to muscle weakness and pain, particularly in the joints, manifesting as diffuse muscle aches, back pain, or joint pain.
  3. Weaker Bones: Vitamin D deficiency can reduce bone density, increasing the risk of osteoporosis and fractures. In children, severe deficiency can lead to rickets, a condition causing soft and weak bones.
  4. Mood Swings: Low Vitamin D levels can affect mood and lead to depression, anxiety, or general irritability.
  5. Weakened Immune System: Vitamin D plays a crucial role in immune system regulation. Deficiency may increase susceptibility to infections, resulting in frequent colds, flu, or other infectious diseases.
  6. Hair Loss: Although less common than other symptoms, Vitamin D deficiency can contribute to hair loss. Low Vitamin D levels may affect hair growth and lead to excessive hair loss.
  7. Impaired Wound Healing: Vitamin D is involved in wound healing and tissue regeneration. Deficiency can delay wound healing and hinder recovery from injuries or surgeries.

It’s important to note that symptoms of Vitamin D deficiency can vary and may not always be apparent. Some individuals may have a deficiency without showing obvious symptoms. If you suspect a Vitamin D deficiency, it’s best to consult a doctor for proper diagnosis and treatment.

Prevention of Overdose and Safe Handling of Vitamin D Supplements:

  1. Follow recommended dosages on the packaging of Vitamin D supplements, and consult your doctor if you have concerns.
  2. Avoid taking multiple Vitamin D supplements simultaneously without medical guidance to prevent overdose.
  3. Be mindful not to inadvertently consume high doses, especially when taking supplements containing Vitamin D3.
  4. Discuss with your doctor if you have concerns about a Vitamin D deficiency or questions about the dosage of Vitamin D supplements.

A balanced approach is crucial to avoiding both deficiency and overdose of Vitamin D3. If you have concerns or notice symptoms of a Vitamin D deficiency, it’s advisable to consult a doctor to have your Vitamin D levels checked and take appropriate action.


Overall, vitamin D3 is an essential vitamin that fulfills a variety of important functions in the body. It is important for bone health, the immune system, mood and much more. A lack of vitamin D3 can lead to a variety of health problems, including fatigue, muscle pain, weak bones and a weakened immune system. It is therefore important to ensure that you get enough vitamin D3, either through sun exposure, supplements or a balanced diet. However, caution is required to avoid overdosing. It is advisable to have regular medical check-ups and if a vitamin D deficiency is suspected, to speak to a healthcare provider to take appropriate action.