Vitamin D and Fertility

Definition

Vitamin D is a fat-soluble hormone that regulates calcium absorption, immune function, and gene expression in reproductive tissues. Deficiency is strongly linked to reduced fertility and pregnancy complications.

How it works

Vitamin D receptors are found throughout the reproductive system, including the ovaries, uterus, placenta, and sperm. This vitamin regulates the production of anti-Müllerian hormone (AMH) and other reproductive hormones that control ovulation and egg quality. Vitamin D modulates immune function to prevent implantation failure and miscarriage, and deficiency increases the risk of PCOS, endometriosis, and poor sperm quality. Studies show that women with adequate vitamin D levels have significantly higher pregnancy and live birth rates, particularly in IVF cycles.

Role

Vitamin D regulates immune tolerance, hormone production, and calcium metabolism essential for reproductive and fetal health.

Examples

• Fatty fish (salmon, tuna)
• Egg yolks
• Mushrooms exposed to sunlight
• Fortified milk and plant milks
• Cod liver oil
• Sunlight exposure (10-30 minutes daily)

Recommendations

Maintain serum vitamin D levels of 30-50 ng/mL year-round through sunlight exposure and food sources. Consider supplementation of 1,000-4,000 IU daily, especially during winter months or if you have limited sun exposure, and have levels tested regularly.

Key takeaway

Vitamin D sufficiency is critical for fertility: it regulates both immune tolerance and reproductive hormones necessary for conception and pregnancy success.

Related terms