Is VDR useful for fertility?

The usefulness of VDR (Vitamin D Receptor) genetic testing for fertility is currently not well supported by strong evidence. Vitamin D is involved in reproductive processes such as implantation and sperm quality, and VDR polymorphisms have been studied in association with fertility outcomes. However, effect sizes are small, findings are inconsistent across populations, and most data come from observational or mechanistic studies rather than randomized trials. The provided context contains no information on VDR. Therefore, any claim that a specific VDR variant meaningfully predicts or improves fertility is premature. For individuals concerned about fertility, measuring blood vitamin D levels and ensuring adequate intake is more actionable than relying on VDR genotyping alone.