Vitamin B1 (thiamine) is involved in normal energy-producing metabolic processes. Vitamin B1 contributes to the normal functioning of the nervous system and the maintenance of normal psychological function, as well as the proper functioning of the heart. Vitamin B1 is water soluble and must be replenished daily, just like the other vitamins belonging to the B vitamin complex. Vitamin B1 is also called moral because of its effect on the nervous system and mental behavior. If you take it continuously, it can cause vitamin C deficiency, so it is advisable to use it proportionately. Vitamin B1 can participate in the metabolism of proteins, fats, carbohydrates, as well as in cellular metabolic processes.