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Enhanced Mood: Vitamin B12 is involved in the synthesis of serotonin, a neurotransmitter that regulates mood

[DOI] [Google Scholar] 33.Leyden J., Stephens T., Finkey M., Appa Y., Barkovic S

Alcohol and tobacco Heavy alcohol intake and smoking both stress the nervous system and bone marrow and can interfere with nutrient status

It is endogenously distributed across both central and peripheral tissues, including the hypothalamus, pituitary gland, and limbic system, making it a broadly studied subject in neuroendocrine and sleep biology research

However, you will find that most vitamin supplements contain much higher doses of vitamin B12, such as 500mcg or 1000mcg