What to watch with VDR and Fruchtbarkeit?

Regarding VDR (Vitamin D Receptor) variants and fertility: Some research links vitamin D deficiency to reduced fertility, but evidence for using VDR genetic tests to guide supplementation is weak. MyBody-X's hormone test does not directly measure VDR variants; it only assesses current vitamin D levels. EFSA sets the upper safe limit at 4000 IU/day for adults – exceeding this without medical supervision risks toxicity. For fertility concerns, a blood test for 25-hydroxyvitamin D is recommended over genetic testing. Supplementation should be discussed with a doctor, as both deficiency and excess can impair fertility. Currently, VDR SNP tests have limited clinical utility for fertility advice.