Carbo’s are a type of supplement for gaining weight that are comprised primarily of carbohydrates. Carbohydrates are a major source of energy within the body. These carbo supplements can contain simple or complex carbohydrates, but are generally very low in fat. Taking carbo supplements after working out can create a better recovery, and it is used by body builders and serious athletes for gaining weight. These supplements are of particular interest to so-called “hard gainers” who need a boost to their weight gain, or for those who have hit their plateau and need a boost to move to the next level.