Hi, I would not recommend any weight gainers in the market to my patients. Increasing weight and putting on extra muscles can be achieved by a positive calorie diet. Here you need to consume more amount of calories than you require. You can achieve it by increasing the consumption. Go for good sources like oats, sprouted seeds that are good in proteins and avoid excessive consumption of fatty foods. Regarding endura mass, I would never recommend it to my patients because of two reasons 1) It contains soy protein. Soy protein may have some kind of hormonal effect that is not at all desirable. 2) They are called as nutritional supplements and never tested far enough for their safety. So, you can never assure anyone of their safety. I would suggest you to see a nutritionist and follow a diet plan as suggested. Hope the above information helps you. Thank you for writing in healthcaremagic. Have a wonderful day.