The B-complex contains eight B vitamins. They form a group of essential vitamins for the normal and healthy functioning of the human body. They are very different in terms of their roles in the body and their chemical composition, but most of them are found in similar foods, which is why they belong together to a group called the B-complex. Vitamins B1, B2, B3, B5 and B7 have different tasks, but the same goal. They take care that the production of energy in our body is smooth and efficient (1, 2). In addition, vitamins B6, B9 and B12 provide the nervous system with the production of hormones and materials that serve as "building blocks" for the cells, as well as the health of the neurons (3).