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Gainers are nutritional supplements to gain weight, supply fast energy and nutrients to the body after training. Common gainers contain proteins, carbohydrates, a little fat to help gain muscle mass. There are also more complex gainers that are enriched with creatine, vitamins or bcaa. Thus, gainers are high calorie protein supplements aimed at increasing daily calorie intake to promote weight gain. They are an excellent helper after training to immediately replenish glycogen in the body, which our body consumes during training. Gainer can be imagined as a complete meal just in the form of powder, which contains all the necessary nutrients after training for quality regeneration. The advantage of the gainer compared to the classic diet is that thanks to the powder form and method of production, it is easier to digest for the body and thus the body receives the necessary nutrients much earlier. It should be noted that the carbohydrate component in gainers can contain two different types of carbohydrates, both complex - ie slowly absorbed and fast sugars. Slow carbohydrates include maltodextrin and fast carbohydrates - sugar, glucose or fructose.