The B vitamins are likewise water-soluble and must be supplied on a daily basis, however their absorption is slightly different. Because they are attached to proteins, they need protein breakdown, which is activated by stomach acids. The majority of B vitamins are absorbed farther down in the small intestine, in the ileum. However, some B vitamins can also be absorbed in other parts of the gastrointestinal tract including the duodenum, jejunum, and colon. B complex vitamins play an important role in the body's ability to function normally. They include thiamin (V), riboflavin (V), niacin (V), pantothenic acid (V), pyridoxine (V) and biotin (V). Of these, vitamin B6 is involved with over 100 enzymatic reactions in the body, including those related to protein synthesis, carbohydrate metabolism, and cell division. Vitamin B12 is needed for the production of red blood cells and nerve cells. Folic acid is used in DNA replication and cell division, while B1 is necessary for the formation of muscle tissue and skin cells. Pantothenic acid plays a role in energy production from carbohydrates and fats. The B complex is essential for healthy living because it provides support to the immune system, regulates blood sugar levels, promotes growth of cells, and helps prevent cancer. It can be obtained through your diet but not all food sources are equal when it comes to nutrition quality.