Does Vitamin D Help with Fertility?

Vitamin D for IVF

Updated: September 25, 2026 · Reviewed by Taylor J. Graber, MD

Medically Reviewed by: Aimee Eyvazzadeh MD

Vitamin D and Fertility

Vitamin D is a fat-soluble vitamin naturally present in few foods, available as a dietary supplement, and produced by the body through sun exposure. Vitamin D obtained from sun or supplements is biologically inactive until the liver and kidneys convert it into its active form, which supports calcium absorption, bone health, and normal levels of calcium and phosphate in the blood.

Vitamin D deficiency is common, particularly during winter months. Research has suggested a link between low blood levels of Vitamin D and outcomes related to fertility, pregnancy, and lactation, including a systematic review and meta-analysis (Chu 2018) of studies in women undergoing assisted reproductive therapy (ART). That analysis found that women with higher Vitamin D levels were more likely to have a live birth, a positive pregnancy test, and clinical pregnancy compared with women who were deficient or insufficient — though no clear association was found between Vitamin D levels and miscarriage risk. A separate analysis found that very low Vitamin D levels were associated with a higher rate of early pregnancy loss, while higher preconception levels were associated with higher rates of clinical pregnancy and live birth.

Our Take

Based on the available published research, Vitamin D supplementation in women trying to conceive appears to be generally safe and may help support Vitamin D and calcium levels. Some studies suggest a possible link between adequate Vitamin D levels and improved pregnancy and neonatal outcomes, though research in this area is ongoing and individual needs vary.

Vitamin D needs — including whether supplementation, and at what dose, makes sense for you — should be discussed with your own doctor or OB, ideally well before you begin trying to conceive, since it can take time to build up and stabilize Vitamin D levels in the body.

If you're exploring ways to support your overall wellness while trying to conceive, our clinical team can talk through options as part of a broader conversation with your own physician. Learn more about our pregnancy-related IV support or read about our approach to fertility-related IV therapy.

Schedule a conversation with our team to learn more.