Hello, Thank you for your contact to healthcare magic. I understand your health concern, if I am your doctor I suggest you that nothing is good to gain weight naturally than to take artificial supplement. I advice you to eat proteinacious diet like eggs, soya bean etc. Do regular exercise especially running. This measures will increase weight and also muscle mass. I am not in a favour to give you advice to start nutrigain. Such supplement are having small steroid hormone which eventually harms in long period. I will be happy to answer all your future concern. Thank you, Dr Arun Tank Infectious disease specialist. Wish you a best health at health care magic.