Myths vs facts: Folsäure and Schlaf

The relationship between folic acid (vitamin B9) and sleep is a topic where myths and facts often blur. Fact: Folate is crucial for DNA synthesis and homocysteine metabolism. Some observational studies suggest a link between low folate levels and sleep disturbances, especially in older adults or those with depressive symptoms. The proposed mechanism involves homocysteine reduction or serotonin production. However, the evidence is weak: no large randomized controlled trials demonstrate that folic acid supplementation improves sleep. A common myth is that folic acid alone can cure insomnia – this is unproven. Another myth is that MTHFR variants (e.g., C677T) necessarily require supplementation for good sleep – this is an overstatement. Most people meet their needs through diet. High-dose folic acid can even have adverse effects (e.g., masking B12 deficiency). Bottom line: A balanced diet rich in folate (kale, spinach, legumes) is sensible, but evidence for a direct sleep benefit from folic acid is limited. For sleep issues, prioritize stress management and sleep hygiene, and consult a doctor if a deficiency is suspected.