Vitamin B1 (thiamine) is necessary to metabolise carbohydrates and to produce acetylcholine. Vitamin B2 (riboflavin) is a precursor to coenzymes after being converted to its bioactive form, in order to be used by the body. Vitamin B3 (niacin) is a precursor to coenzymes and plays an important role in energy transfer reactions for the metabolism of sugars, fats and alcohol. Vitamin B5 (pantothenic acid) is a precursor to coenzyme A, which is necessary for metabolizing amino acids, fatty acids etc. Vitamin B6 (pyridoxine) in 5 pyridoxine phosphate form is an important coenzyme for decarboxylation. Folic acid works synergistically with Vitamin B12 for DNA synthesis, which is necessary for all skin cells. Vitamin B12 (cyanocobalamin) is coenzyme necessary in order to process carbohydrates, proteins and fats and is involved in erythropoiesis. In addition, it is essential for the maintenance of nerve sheaths. Inositol is an important intermediate element, of the second messengers, as well as a primary element of the cell membrane phospholipids involved in many biological processes. Vitamin B7 (D-Biotin) is an essential coenzyme, which works synergistically with other B-complex vitamins, for the synthesis of proteins, carbohydrates and fatty acids. Choline is essential for the formation of nerve impulses, which convey information through the nervous system. Moreover, it is involved in the production of hormones and is necessary for the metabolism of fats and cholesterol. Para-aminobenzoic acid (PABA) is essential for the folic acid synthesis and for maintaining healthy skin.