Definitely, even without screening, the first step should be a prescription for basic OTC nutrients for which people are often deficient and that are associated

Definitely, even without screening, the first step should be a prescription for basic OTC nutrients for which people are often deficient and that are associated with depression, zinc, vitamin D etc... Similarly, most of the time people leave the doctor with a prescription for paracetamol and an advice to monitor the symptoms and come back a short while after if the symptoms don't improve. It's simply a low cost and efficient first step of the diagnostic.