Evidence check: B12 in the context of Stress

The role of vitamin B12 in stress is not strongly supported by evidence. B12 is crucial for nerve function and neurotransmitter synthesis (serotonin, dopamine), which influence mood. Deficiency can cause fatigue and depressive symptoms that may mimic or worsen stress. However, no robust clinical trials show that B12 supplementation reduces stress in non-deficient individuals. Evidence is limited to observational and mechanistic studies. Consumer tests often overstate the link. If you have normal B12 levels, taking extra is unlikely to help with stress. Safety note: high doses are generally safe, but stress management should address lifestyle factors like sleep, exercise, and diet. Evidence rating: unclear due to lack of direct human trials.