Hello, if you want to increase muscle you have to take lean protein & protein supplement for muscle increase.but in 15 days it's very short period for helathy way to growth.

Dear User, I hope you are doing well. There is a need to correct your eating pattern .Weight gain need proper strategy to gain muscle. We are having weight management program which is based on customized diet along with clinical fitness so there is no side effects. You may know more about us and start consult with us through our website https://www.facebook.com/diet4health/

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To gain weight its very important to follow a healthy diet which has optimal amounts of first class proteins (dairy products,egg,fish,etc) complex carbohydrates(oats,brown rice etc) & healthy fats (almonds,walnuts etc )along with a structured exercise program that is balanced with weight training and cardio will surely help. Kindly contact us to get customized diet & workout plan.

See, it's a human body, changes have to gradual as a high protein diet required. Before that certain vital statistics need to be considered. For a detailed guidance contact me directly