This brief video on the Walsh overmethylation - folate deficiency depression biotype [2 of 5] - will remind you of the the fact that depression is more than just an appearance of sadness.
My mission here at CorePsych is simple: Use stimulant medications precisely. If they don't work predictably it's highly likely that your body is influencing the way medications are metabolized.
If you appreciate my consistent CorePsych perspective on the serious need for dramatic improvements in mind care, you will love this video with Sapolsky.