Evidence check: Nährstoffcheck in the context of Müdigkeit

A nutrient check in the context of fatigue can be useful if an actual deficiency exists (e.g., vitamin B12, iron, vitamin D). However, the evidence for genetic tests claiming to predict such deficiencies is weak. The provided contexts cover MC4R (monogenic obesity), IL1B (inflammation), and rs6265 (BDNF/stress) – none directly address nutrient checks or fatigue. The only DNA test QA in the context rates skin glycation tests as marketing without robust evidence. Therefore, caution is warranted: many commercial nutrient checks rely on poorly validated biomarkers or correlations. Fatigue has numerous causes (sleep, stress, diet, underlying conditions). A nutrient check may serve as a screening tool but does not replace medical evaluation. The evidence level is mixed: for some nutrients there is strong clinical evidence (e.g., B12 deficiency), but genetic prediction is mostly mechanistic or GWAS-based, not clinically confirmed. Safety note: persistent fatigue should always be evaluated by a physician before taking supplements.