Cyanobol is a supplement that contains the active ingredient 5-amino-1-(5-phospho-D-ribosyl)-imidazole-4-carboxamide, often referred to as AICAR. It is primarily marketed for its potential to enhance athletic performance and endurance by promoting the production of energy in muscle cells. Some users also claim it may aid in fat loss and improve recovery times. However, its efficacy and safety for these purposes are not well-established, and it may be subject to regulations in competitive sports.