Is Folsäure useful for Darmgesundheit?

Folic acid (vitamin B9) is crucial for cell division and DNA synthesis, making it theoretically important for the rapidly renewing gut lining. Some research suggests a role in maintaining intestinal barrier integrity and modulating the microbiome, but the evidence is weak and mostly mechanistic (animal or in vitro studies). High-quality human trials are lacking. For individuals with a confirmed deficiency, supplementation may support gut health, but for those without deficiency, benefits are unproven. High doses (>1 mg/day) may pose risks, such as masking vitamin B12 deficiency. Consumers should not rely solely on folic acid; a balanced diet rich in natural folates (leafy greens, legumes) is recommended. A gut microbiome test can identify individual needs, but it does not replace medical advice.