Or even general blood screenings. I once went to the doctor for depression that was severe enough to affect work and marriage. I was fortunate that the doctor

Or even general blood screenings. I once went to the doctor for depression that was severe enough to affect work and marriage. I was fortunate that the doctor tested for B12 deficiency, a week of methylated b12 supplementation fully fixed my depression which hasn't returned in years. Turns out there is a genetic component to B12 deficiency, and other family members have been turning up with the same kind of thing. I wonder how many people get driven into expensive medication and treatment programs for relatively simple to treat vitamin/metabolic disorders.