Vitamin D plays an important role in many biological processes in our body, whether in bone and muscle health or in the immune system. However, recent research suggests that it may also play a crucial role in fertility. In the Czech Republic, more than half of the population suffers from its deficiency.
Less Sun, Less ‘D’
Vitamin D is primarily obtained by spending time outdoors, colloquially from the sun. The impact of the sun’s rays (specifically UVB) on our skin triggers its synthesis in the body. It is then converted into its active form in the liver and kidneys. However, the time required to be outdoors to obtain sufficient ‘D’ depends on many factors, such as location, season, cloudiness, time of day, skin pigment intensity, or exposed skin area.
A certain wavelength of UV radiation is also necessary for the production of vitamin D. This is available in our region only from April to October, between 10 am and 3 pm. It’s enough to be in the sun for about 20 to 30 minutes during these months. During this time, the skin can produce over a hundred times the recommended daily dose and store the excess for later use.
Although the primary source is sunlight, vitamin D can also be obtained from food. Its richest natural source is fish oil, especially from salmon, mackerel, and herring. It is also found in smaller amounts in liver, egg yolks, sardines, and tuna. Unlike the ‘D’ obtained from the sun, the body cannot store the vitamin D from food or supplements.
Age is also a risk factor for adequate vitamin D levels. With advancing years, the skin’s ability to produce vitamin D decreases. Certain digestive tract diseases, such as Crohn’s disease or celiac disease, can also complicate vitamin D absorption in the body. Regular users of corticosteroids or weight loss medications should also be cautious.
The Impact of Vitamin D on Fertility
Those trying to conceive should also take note. The latest studies show that men with higher vitamin D levels tend to have better-quality sperm (higher count and mobility) and higher testosterone levels, which increases the chances of successful egg fertilization.
In women, a lack of vitamin D can affect reproductive health and the menstrual cycle. Its deficiency can manifest as painful menstrual cramps (dysmenorrhea), irregular cycles (amenorrhea), or even a complete cessation of the cycle. Some studies also show that low levels of vitamin D can affect estrogen levels and thus influence conception itself. Women with higher levels of ‘D’ have a greater chance of becoming pregnant, even with assisted reproduction. Additionally, the risk of recurrent miscarriages is reduced.
However, it’s important to realize that the necessary amount of vitamin D is individual. If you are unsure whether you have a vitamin D deficiency, you can have its levels measured at Repromeda. Considering the latest scientific findings, we have introduced preventive testing for ‘D’ and other vitamins in the body. Based on the results, we can then recommend individual medication.
