Thanks for posting your enquiry to HealthCareMagic website, As can be seen, you are suffering from low weight gain. In order to provide a judgement on your ideal weight, it is essential to calculate your normal weight based on your age, sex, and height. For example assuming that your height is 170 cm, you are male and 25 years old, the ideal weight for you is about 60 kg. The Endura Mass products is a kind of supplements produced by some companies. In this case, various products are found such as those specialized for advanced levels of bodybuilding, ordinary weight gain, etc. For example, there is a well-known company in the USA producing high quality of these products made from fruitarian products, proteins, minerals and vitamins adding lots of calories each day. Please notice that in USA Endure Mass lacks the approval authorization from the FDA. This well-known company claims that Endure Mass is not recommended for those suffering from renal diseases, etc. and also recommends you to use it after consulting with doctors expert in nutritional sciences. The goal of dietary supplements is getting sufficient necessary nutrients from their perspective. Professor Marina from the University of Helsinki believes that more than 90% of dietary supplement products and programs are incorrect. Some consumers and evaluators report unsafe levels of arsenic, cadmium, lead and mercury in several of the protein powders examined. The point is that I do not know exactly to what extent the products purchased by you are made based healthy and safe methods. Is that really standardized? Therefore, please notice that this a risky way to gain weight using some products such as Endura Mass. According to instructions posted by you and my experience I recommend you as follows: 1. You demand to test your body using routine urine, blood, organ (such as kidney, liver, etc.) tests. 2. To assess and approach your weight loss, you demand to take some specific tests ordered by your doctor to rule out some diseases such as COPD, Malignancies (very low probability in your case), Infections, Gastrointestinal disorders, other organs diseases, Malnutrition due to psychological or socio-economic problems. 3. Set a normal lifestyle using appropriate physical activity, sufficient food intake and effective social activities. 4. Given that, all diseases and abnormalities mentioned above have been ruled out in your case, and still you cannot get appropriate weight gain, you may use supplementary nutrient products prescribed by your doctor. You might take the regular kidney, other organ function tests after this. Hope you find my suggestions useful, Regards