Myths vs facts: B12 and Schlaf

Vitamin B12 is often linked to sleep, but the scientific evidence is limited. A common myth is that B12 deficiency directly causes insomnia. While severe deficiency can lead to neurological symptoms that may indirectly affect sleep, a clear causal role for B12 in sleep disorders is not established. Another myth is that high-dose B12 improves sleep quality. Some studies suggest B12 may influence melatonin production, but effects are small and inconsistent. For healthy individuals without deficiency, extra B12 is unlikely to benefit sleep. The fact is: treating confirmed deficiency is important, but B12 is not a sleep aid. Evidence comes mostly from observational and mechanistic studies, not robust clinical trials. If you have sleep issues, focus on stress, sleep hygiene, and other nutrients (e.g., vitamin D, magnesium) first. B12 supplementation for sleep is not recommended unless deficiency is present.