Each human being has unique biochemistry which results in diverse nutritional needs. Individuals may be deficient in certain nutrients and overloaded in others. Advances in epigenetic science have sealed the powerful impact of nutrients on gene expression and have enabled improved treatment for mental disorders. Neurotransmitters, which are instrumental in mental disorders, appear to be epigenetic in absorption , metabolism and storage of key nutrients. For example we now understand that methionine and SAMe act as serotonin reuptake inhibitors, and folates and niacinamide depress neurotransmission at dopamine receptors. For the first time we are able to adjust gene expression of enzymes that may be a improper levels. Dr. Walsh has accumulated a data base of over 10,000 patients and shares his nutrient supplementation to patients with mental conditions such depression, schizophrenia, autism and Alzheimer's Disease