If only depression was simple enough that it could be cured by supplements. Alas, it’s not, but that doesn’t mean a supplement can’t nudge you closer to a more content state.
Most people with clinical depression have tried medications. SSRIs are a multi-billion dollar business, and there are thousands of papers to wade through to estimate how effective they are for different people.
The idea of using a device to help with depression is intuitively appealing: use device, and then zap, less depression right away!