Nature's Harbor Vitamin B-5, also known as pantothenic acid, is one of eight B complex vitamins. Like most B complex vitamins, Vitamin B-5 is utilized in the metabolism of fats and carbohydrates and energy production. It also aids in the manufacture of adrenal hormones and red blood cells. Vitamin B-5 plays an important role in maintaining a healthy digestive tract and enhancing the strength of the immune system. It is known as the anti-stress vitamin because it may improve the body's ability to withstand stressful conditions.