Vitamin B12, in particular, has a great impact on neurological health. When it comes to neurological concerns, vitamin B1 (thiamine), B2 (riboflavin), B3 (niacin), B7 (biotin), B6 (pyridoxine), B9 (folate, synthetically known as folic acid), and B12 (cobalamin) are especially important. Methionine is an amino acid that donates the methyl groups required for methylation reactions (biochemical reactions that are essential for the synthesis of the above-mentioned substances) to occur. Without methionine, myelin and neurotransmitters that are needed for neurological development, maintenance, and functions, cannot be produced. Vitamin B12 thus proves to be a very important micronutrient for brain health in both the children and the elderly. There are various conditions that may lead to the deficiency of this vitamin. But if the cause is due to a dietary deficiency, the proper and timely supplementation of this ‘nervous vitamin’ can prevent damage to the nervous system.