welche vitamine helfen bei müdigkeit — what are common causes?

Fatigue has many causes – from sleep deprivation and stress to nutrient deficiencies. Vitamins such as B12, B6, folate (B9), vitamin D, and iron (not a vitamin but crucial) are commonly linked to energy metabolism and red blood cell formation. A deficiency can worsen fatigue, but evidence for routine supplementation in people with normal levels is weak. Most studies show clear benefit only when a deficiency is confirmed. Additionally, thyroid disorders, depression, or chronic inflammation (e.g., elevated CRP) can underlie exhaustion. DNA tests for MTHFR variants (rs1801133) are often marketed for fatigue, but the clinical relevance is unclear – associations are small and non‑specific. Instead of self‑testing and unguided supplementation, a medical workup with blood counts (including ferritin, B12, vitamin D, TSH) is advisable. The provided context does not contain direct evidence for vitamins against fatigue; the evidence here is based on general medical knowledge. Caveat: marketing for microbiome or DNA tests for fatigue often overstates their predictive value.