Brain performance The brain is the largest and most important part of your nervous system. It contains billions of neurons, and is home to thoughts and feelings. It receives and coordinates signals from your senses, movement and memory. The normal function of the brain is dependent on many different nutrients. Clear Brain is based on a natural extract combination as well as vitamins and minerals. The content of iodine contributes to normal cognitive functions. Pantothenic acid contributes to normal mental performance. Riboflavin, niacin, vitamin B6 and B12 reduces fatigue and contribute to the normal function of the nervous system. Niacin, vitamin B6 and B12 contribute to normal psychological functions.