As the days grow shorter and the sunlight fades, many of us naturally spend less time outdoors. While this seasonal shift may feel cosy, it also means our bodies produce less vitamin D — the so-called “sunshine vitamin.”
Vitamin D is far more than just a bone-strengthening nutrient. Research increasingly shows its importance in fertility and pregnancy:
- For women, vitamin D helps regulate ovarian function, supports healthy egg development, and plays a role in the immune system — which is crucial for embryo implantation. Deficiency has been linked to lower IVF success rates and a higher risk of complications in pregnancy.
- For men, vitamin D has been associated with better sperm quality, motility, and overall reproductive health.
- During pregnancy, adequate vitamin D reduces the risk of gestational diabetes, pre-eclampsia, and low birthweight, while supporting your baby’s bone and immune development.
Unfortunately, vitamin D deficiency is common in the UK, especially from October to March, when sunlight is insufficient to maintain healthy levels.
What you can do:
- Consider a daily supplement of 10 micrograms (400 IU) — the dose recommended by the NHS for adults, including those trying to conceive.
- Include dietary sources such as oily fish, eggs, and fortified foods.
- Take advantage of any daylight hours outdoors, even short walks can help.
As winter approaches, topping up your vitamin D is a simple, evidence-based step that could make a real difference to your fertility journey and beyond.
