Experts recommend 250–500 mg of combined EPA (eicosapentaenoic acid ... Best foods to eat: B vitamins, especially B6, B9 (folate), and B12, play an important role in brain function.

If you supplement, you can avoid side effects by taking no more than 100 mg of vitamin B6 each day. Vitamin B6, also known as pyridoxine, plays an important role in many of your body's functions.