17 years old is actually not very recommended to take this sports supplement product. You can increase your intake through diet. If you can't eat a lot, you can choose a small number of meals and form a habit. In fact, to gain muscle, the main intake is carbohydrates, such as oatmeal and potatoes, which are all very good, followed by protein. Such as beef, fish, chicken and egg protein. The ratio in protein is 0/.5 to 2 grams of protein per kilogram of body weight/kloc-0. As long as you have enough carbohydrates, protein intake and proper scientific training, you can definitely gain weight. After half an hour of exercise, add carbohydrates and then protein. You can eat steamed bread and a few egg whites (egg yolk cholesterol is too high, it is recommended to eat no more than four egg yolks per week). But you can eat more protein. So if possible, it will waste egg yolk.