Once thought of as a single nutrient, it is now known that B Complex is made up of several individual vitamins. All B vitamins are water-soluble & therefore not stored in the body for any length of time, so must be replenished on a regular basis, at least once a day, to avoid possible deficiencies. Thought to function best as a group, the synergistic B vitamins are contained in all living tissue & have a major role to play in all functions of the human body. B Complex is essential for sustaining a healthy nervous system, which enables us to cope with the everyday stresses life throws at us. B vitamins are heavily involved in our energy production as they help release this energy from both the carbohydrates & proteins we eat, which in turn helps with proper digestion. Also essential for brain function, production of healthy red blood cells & most importantly the growth of healthy hair, skin & nails. This 100mg B Complex is a great boost to anyone's supplement regime.