Carbohydrates are the most important source of energy for our bodies. Technically called carbohydrates, they are organic compounds that are indispensable to our bodies. Supplements of this essential macronutrient can be divided between those based on simple carbohydrates, which are recommended for restoring glycogen reserves at the end of training, and those based on complex carbohydrates (such as maltodextrins), which when taken before or during physical activity provide the body with constant energy. Normally, a carbohydrate intake of 5-7g/kg bw/day is recommended for those who exercise regularly, while for the support of intense training the quota can go up to 7-10g/kg bw/day. The requirement is however strictly personal and depends on many factors, related to the sport practised and the individual athlete.