How are VDR and Fruchtbarkeit related?

The link between VDR gene variants and fertility is an area of active research but remains inconclusive. The vitamin D receptor (VDR) mediates the action of vitamin D, which is involved in ovarian function, sperm quality, and endometrial receptivity. Some studies have reported associations between common VDR polymorphisms (e.g., FokI, BsmI, TaqI) and conditions like PCOS, endometriosis, or IVF outcomes. However, effect sizes are modest, and most evidence comes from observational or GWAS studies, not randomized trials. A VDR genetic test alone cannot diagnose a fertility problem or predict who will benefit from vitamin D supplementation. The most actionable step is to measure your actual 25-hydroxyvitamin D level via a blood test. If you are trying to conceive, discuss vitamin D status and supplementation with a healthcare provider. Safety note: excessive vitamin D can be harmful. Evidence: human-moderate (associations, not causal).