Vitamin D: Everything You Need To Know

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Often referred to as the sunshine vitamin, did you know that vitamin D may play a role in female and male fertility?

Let's unpack the importance of vitamin D in fertility and provide information on how to optimise your vitamin D levels to help with conception.

Vitamin D and Female Fertility

Research has shown that vitamin D plays a vital role in female reproductive health. Adequate levels of vitamin D are important for ovarian function, menstrual cycle regulation, and embryo implantation. Vitamin D deficiency has been associated with an increased risk of polycystic ovary syndrome (PCOS), a common cause of female infertility.

Vitamin D and Male Fertility

Vitamin D may also play a role in male fertility.

Studies have shown that men with higher levels of vitamin D may have better sperm quality and motility. Vitamin D deficiency has been associated with lower testosterone levels, which can affect sperm production.

Vitamin D2 vs Vitamin D3

There are two main forms of vitamin D: D2 (ergocalciferol) and D3 (cholecalciferol). While both forms can increase blood levels of vitamin D, D3 is considered to be the better form because it is more potent and has a longer half-life than D2.

D3 is also the form that is produced in the skin when it is exposed to sunlight, making it the most natural form of vitamin D. Overall, choosing a vitamin D supplement that contains D3 is recommended.

Vitamin D Fertility Dosage

The recommended daily intake of vitamin D for adults is 600-800 IU (International Units) per day. However, some studies suggest that higher doses may be needed for optimal fertility.

Getting enough vitamin D through food sources alone can be challenging, especially in countries with limited sunlight exposure like the UK. Therefore, a vitamin D supplement may be necessary to achieve adequate levels. Vitamin D3, the most active form of vitamin D, is the preferred form for supplementation. We recommend Vitamin D Spray which delivers 1000iu (25ug) per spray. We recommend one spray per day, preferably after a meal.

Adequate levels of vitamin D are essential for ovarian function, menstrual cycle regulation, embryo implantation, and sperm quality. If you are trying to conceive, it is essential to maintain optimal vitamin D levels through a combination of diet, sunlight exposure, and vitamin D supplementation.


Further reading

  • Fertility Tests Explained


    Fertility Tests Explained

  • IVF After 40


    IVF After 40

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