Evidence check: VDR in the context of Haut

The vitamin D receptor (VDR) is frequently discussed in the context of skin health, particularly psoriasis, skin barrier function, and premature aging. The evidence is moderate: human observational studies and GWAS have linked VDR polymorphisms (e.g., FokI, TaqI) to psoriasis risk, but effect sizes are small and replication inconsistent. For direct anti-aging effects (collagen, elasticity), robust clinical trials are lacking; most data come from cell or animal models. VDR does influence keratinocyte differentiation and local vitamin D activation, which is biologically plausible, but a personalized recommendation based solely on a genetic test is not evidence-based. Caveat: Vitamin D supplementation should not be guided by a VDR test alone – blood levels of 25(OH)D are clinically more relevant. MyBody-X tests provide orienting hints, not diagnoses.