Vitamins are dietary components which are necessary for life. They play a major
role in health and their deficiency may be linked to symptoms of psychiatric disorders. B vitamins
are required for proper functioning of the methylation cycle, monoamine oxidase production,
DNA synthesis and the repair and maintenance of phospholipids. Vitamin B deficiency
could influence memory function, cognitive impairment and dementia. In particular, vitamins
B1, B3, B6, B9 and B12 are essential for neuronal function and deficiencies have been linked
to depression. We discuss the causes of depression and the neurochemical pathways in depression.
In particular, we provide evidence that vitamin B contributes to the complexity of depressive