Brain fog is becoming an increasing problem in our society. The B vitamins, especially B1 and B12, are critical for mental clarity. Inositol also helps promote being calm and can be especially helpful for those who are anxious. Many amino acids (proteins) are critical for adequate neurotransmitter levels (e.g., serotonin, dopamine, and epinephrine). Deficiencies of these amino acids and neurotransmitters, as well as many vitamins and minerals, can commonly cause depression. I suspect you will be amazed at how much happier you feel when you get adequate nutritional support.