Vitamin B1 (thiamine): Vitamin B1 may help naturally combat the negative effects of stress while supporting healthy energy levels, a proper nervous system, and muscle function. Vitamin B-1 plays an important part in the breakdown of foods, especially carbohydrates. It helps the body convert carbohydrates into glucose, which is then used to produce energy. Vitamin B-1 is considered an anti-stress vitamin because it supports proper nervous system and muscle functioning and may enhance the body's ability to withstand stressful conditions. Vitamin B-1 is also necessary for the production of hydrochloric acid, making it important for proper digestion. Because Vitamin B-1 is water soluble, it's not stored in the body and must be replenished daily. Although thiamine deficiency is rare, it can result in serious health complications involving the nervous system, brain, muscles, heart and gastrointestinal system. Individuals who consume heavy amounts of alcohol or who are chronically malnourished may have a higher-than-usual need for vitamin B-1.