How are Folsäure and Müdigkeit related?

Folate (vitamin B9) is essential for cell division and red blood cell formation. A deficiency can lead to megaloblastic anemia, whose primary symptom is fatigue and weakness. The link is clinically well-established: without sufficient folate, the body produces fewer functional red blood cells, impairing oxygen delivery to tissues and causing fatigue. Folate also plays a role in energy metabolism. Genetic variants (e.g., MTHFR) can affect folate metabolism and may increase susceptibility to fatigue, but the effect is moderate and depends on diet, lifestyle, and other factors. A blood test measuring folate and homocysteine levels can provide clarity. Important: high-dose folic acid supplements can mask a vitamin B12 deficiency, which also causes fatigue. Therefore, supplementation should always be discussed with a doctor. The evidence is strong (human-strong), based on decades of clinical research.