The idea of using a device to help with depression is intuitively appealing: use device, and then zap, less depression right away!
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.
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.