Unfortunately, it is not that simple. However, recent studies show that vitamin D, which is formed in the skin with the help of UVB radiation from the sun, plays a crucial role in both male and female fertility. Therefore, in case of involuntary childlessness, an examination of the vitamin D level should always be made.
Vitamin D has an influence on sex hormone production in men and women
In men, for example, vitamin D can increase testosterone levels if they have previously suffered from vitamin D deficiency. In addition, the vitamin also affects sperm production and maturation and can be instrumental in improving male fertility.
In women, the vitamin can regulate the menstrual cycle and promote egg maturation or the development of the endometrium. Additionally, high levels of vitamin D have been found to increase the success of artificial insemination through in vitro fertilization (IVF).
Of course, vitamin D deficiency is not the only reason for decreased fertility. However, addressing this deficiency should be an integral part of fertility enhancement therapy.
So we advise you to enjoy the sun at every opportunity – depending on your skin type for about 15-30 minutes per day without sunscreen. This is because even a sun protection factor of 8 would reduce the skin’s vitamin D synthesis by 95%.
Exercise and a healthy diet also have a positive effect on vitamin D levels. Foods rich in vitamin D include fatty fish, such as herring or salmon, avocados, and mushrooms. However, a tangible vitamin D deficiency can usually only be corrected by taking a vitamin supplement. It is best to consult your doctor about this.
 Pilz S. et al., Effect of vitamin D supplementation on testosterone levels in men, Hormon Metab Res., März 2011
 European Society of Endocrinology. “Vitamin D supplements could improve fertility.” Medical News Today. MediLexicon, Intl., 24 May. 2017