hai, your Body mass index says you are underweight. Intially don t go for any protein supplements. First eat protein nourished foods like Almond,cashew,channa,soyabean,peanut in your daily food intake. Add jaggery,black gram,and dal prepared with ghee. take diary product like milk,yogurt,chesse,butter etc. Add banana and tuber vegetables. This will nourish in a healthy way and gain weight. if you still didnt put weight and you feel fatique and tiredness and consult your doctor and take protein supplement. Because protein supplement Endura mass advised for Athletes for sustain release of energy during their exercise. Normal being not advised to take endura mass. Hope i answered your query Thank you