Biotin has a couple of names. It has been called vitamin B7 as well as vitamin H. Whichever name you choose to call it, it is a water-soluble vitamin that belongs to the B-complex vitamins group. Biotin has many uses in the body, but is particularly important in metabolizing fats and amino acids. It is also used in cell growth. Biotin is a key component in the Citric Acid Cycle, which is a process by which energy is created during aerobic exercise.