Vitamin D and Female Fertility — A Frequently Missed Connection

Vitamin D deficiency is one of the most common nutritional deficiencies in Australia — and one of the most frequently overlooked factors in female fertility assessment.

Vitamin D receptors are found throughout the female reproductive system, including the ovaries, uterus and placenta. This distribution points to a direct functional role in reproductive health that goes well beyond its well-known contribution to bone density.

Research has shown that vitamin D plays a role in regulating reproductive hormones, supporting follicular development, improving endometrial receptivity and reducing systemic inflammation — all of which are critical factors in both natural conception and assisted reproduction outcomes. Notably, studies have indicated that infertile women treated with vitamin D had a significantly increased clinical pregnancy rate, highlighting just how meaningful this simple, correctable deficiency can be.

Given how common insufficiency is in the Australian population — even with our climate — vitamin D is a non-negotiable marker in any preconception assessment. Optimal levels for fertility sit considerably higher than the threshold used to define clinical deficiency, which means many women with “normal” results are still not where they need to be.

Vitamin D is assessed as part of our Fertility Support Program and our Energy & Fatigue Panel.

Source: PMC9896710 — Vitamin D and female fertility.
Read the full study here