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The Invaluable Health Benefits of Vitamin D


Vitamin D, often called the 'sunshine vitamin', plays a crucial role in maintaining overall health. Although its association with bone health is well known, the benefits of vitamin D extend far beyond that. In this article, we will explore the multiple benefits of this essential vitamin for physical and mental well-being.

  1. Support for bone health:

Vitamin D is essential for the absorption of calcium and phosphorus, the two minerals essential for bone health. It plays a major role in the formation and maintenance of bone density, preventing the development of conditions such as osteoporosis.

  1. Strengthening the immune system:

Studies have shown that vitamin D plays a crucial role in strengthening the immune system. It stimulates the production of antimicrobial peptides, which help fight infections and diseases. An adequate level of vitamin D is therefore essential to maintain a robust immune defense.

  1. Chronic disease prevention:

Research suggests that vitamin D may play a role in preventing chronic diseases such as type 2 diabetes, cardiovascular disease, and certain types of cancer. Adequate levels of vitamin D are associated with a reduced risk of developing these conditions, highlighting its importance for long-term health.

  1. Mental well-being:

Vitamin D not only benefits the body, but also the mind. Studies have linked low vitamin D levels to mood disorders such as depression. Ensuring optimal levels of vitamin D can help support mental health and reduce the risk of emotional disorders.

  1. Regulation of metabolism:

Vitamin D influences metabolism, which can have a significant impact on body weight and weight management. Adequate levels of vitamin D are associated with better regulation of appetite and fat metabolism, which may help prevent obesity.

Why is vitamin D produced by UV rays better for your health?

Vitamin D produced by exposure to ultraviolet (UV) rays from the sun, particularly UVB, is often considered beneficial to health compared to vitamin D obtained from from food sources or supplements. Here are some reasons why UV-produced vitamin D is often preferred:

  1. Natural production in the skin: When the skin is exposed to UVB rays from the sun, it naturally synthesizes vitamin D. This production method is considered as natural and considers it to reproduce the natural biological process of the organism.

  2. Response regulated by the body: When vitamin D is produced by the skin thanks to sun exposure, the body naturally regulates production accordingly. of his needs. This means that the body can adjust the amount of vitamin D produced based on various factors, such as season, geographic latitude, and skin pigmentation.

  3. Active form of vitamin D: Vitamin D produced by the skin is initially in an inactive form. However, it is quickly converted to its active form by the liver and kidneys. This active form of vitamin D is considered more effective in regulating the metabolism of calcium and phosphorus, essential for bone health.

  4. Storage life in the body: Vitamin D produced by sun exposure has a longer storage life in the body compared to vitamin D from food sources. This means that even in the absence of continued exposure to sunlight, the body can still use stored vitamin D for some time.

  5. Additional beneficial effects: Sun exposure is associated with health benefits beyond just vitamin D production. Moderate sun exposure is linked to improved mood, sleep regulation, and other positive effects on physical and mental well-being.

However, it is essential to emphasize that excessive exposure to the sun can also be harmful due to the risk of sunburn and skin cancer. It is recommended to find a reasonable balance between sun exposure and taking vitamin D from other sources when necessary to avoid the risks associated with excessive UV exposure.

How long is exposure to synthesize the vitamin D needed on a daily basis?

The amount of sun exposure time needed to synthesize enough vitamin D depends on several factors, such as skin pigmentation, time of day, season, geographic latitude, and amount of skin exposed. Here are some general guidelines:

  1. Skin Pigmentation: People with lighter skin synthesize vitamin D more quickly than those with darker skin, because skin pigmentation acts as a barrier to UVB rays. Thus, individuals with darker skin may require longer exposure to sunlight to produce adequate levels of vitamin D.

  2. Time of day: Sun exposure is more effective for the synthesis of vitamin D when the sun is more direct. UVB rays are more abundant when the sun is higher in the sky, generally between 10 a.m. and 3 p.m. However, this may vary depending on the season and latitude.

  3. Amount of skin exposed: The greater the surface area of skin exposed, the greater the production of vitamin D. Exposing arms and legs, without sunscreen, is generally recommended. However, caution is essential to avoid sunburn.

  4. Exposure time: In general, sun exposure of about 10 to 30 minutes two to three times a week is often considered sufficient for most people. However, this may vary depending on the factors mentioned above.

  5. Season and latitude: During the winter months, especially in areas at higher latitudes, the angle of the sun is lower, which can make the synthesis of the vitamin D less effective. Longer exposure may be necessary during these periods.

It is important to note that using sunscreens can reduce the body's ability to synthesize vitamin D because they block UVB rays. However, it is also crucial to protect the skin from damage caused by excessive sun exposure, including sunburn and the risk of skin cancer.

Before making any significant changes to your sun exposure, it is always recommended to consult a healthcare professional for advice tailored to your individual situation.


Vitamin D, often overlooked, turns out to be a versatile vitamin with invaluable health benefits. Whether to maintain strong bones, strengthen the immune system, prevent chronic diseases or support mental health, vitamin D is an essential ally. It is therefore crucial to ensure that our bodies receive enough of this valuable vitamin, whether through sun exposure, a balanced diet or supplements if necessary. Investing in our vitamin D intake means investing in our long-term well-being.

Author: Luc Dessauvages

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