Very few medical professionals have any idea of how nutrition affects health, let alone mental health. I had B12 levels just above the bottom of the reference range and my doctor didn’t even notice because the report didn’t flag them – as if reference ranges were set in stone. He called the idea of injections “woo” and offered me adderall for my low energy instead. Obviously I knew better and fired him, but it can be difficult to find a good professional. I have had a lot of success with supplements that address methylation (many people are poor methylators genetically), mitochondrial biogenesis, and hormone/HPA axis issues.