Myths vs facts: VDR and Sport

The question about myths vs facts regarding VDR (Vitamin D receptor) and sport cannot be directly answered from the provided context, as it contains no specific information on VDR or its relation to athletic performance. Generally, VDR polymorphisms (e.g., rs2228570, rs1544410) can influence vitamin D metabolism and signaling. Some studies suggest links to muscle strength, bone density, and recovery, but the evidence is mostly mechanistic or based on small cohorts. Consumer DNA tests like MyBody-X often report VDR variants, but the clinical utility for personalized sport recommendations is low. No robust randomized controlled trials demonstrate that VDR genotype-based supplementation or training reliably improves performance. Therefore, caution is warranted: marketing claims about 'genetically optimized training' are often exaggerated. Adequate vitamin D status (blood levels) is important for athletes regardless of genotype. Evidence grade: mechanistic/unclear.