Biotin, also known as Vitamin B7 and Vitamin H is important in many functions of the body. The main function of biotin is to help improve energy and function as a coenzyme in CO2 (carbon dioxide) transfer. But, did you know that without vitamin B7, your bone marrow, sweat glands and even nerves won't function optimally? Biotin supplements are important if you want to ensure that you have enough biotin, or have a biotin deficiency.