What role does Folsäure play in Sport?

Folic acid (vitamin B9) is crucial for DNA synthesis, cell division, and red blood cell formation. In sports, adequate intake supports oxygen transport and energy metabolism. Deficiency can lead to fatigue, reduced performance, and increased injury risk. However, there is limited evidence that supplementation beyond the RDA enhances athletic performance in non-deficient individuals. Some studies suggest benefits for homocysteine regulation, which may support vascular health, but the data are moderate and not conclusive. High doses can mask vitamin B12 deficiency, a concern especially for vegans. Genetic variants (e.g., in the MTHFR gene) can affect folate metabolism, but a DNA test alone does not replace medical advice. Athletes should aim for adequate intake through diet (leafy greens, legumes) and supplement only if a deficiency is confirmed.