Thanks for the query. Firstly understand that weight gain is very dependent on genetics and metabolism. It is important to know that just eating just two heavy meals a day will not help. Eating the right foods at the right time is very important. Eat meals at frequent intervals. Eat a mid meal between each main meal. Avoid junk foods. Include dairy, eggs, nuts, fruits in your meals. Avoid alcohol and smoking. Exercise at least thrice a week. Even if you were to take medicines or supplements they will not work in isolation You need to have a calorie and nutrient dense meal. So, first try to improve your diet before you decide to start any supplement.