hi,i understand your concern..well..yes you can take nutrigain bcoz this product is also available by the name itself or as Nutrigain plus but in the form of granules and capsules. It helps underweight people to increase their weight by filling them with more energy in the natural way. It also improves the metabolism of the consumer hence increasing the overall health of the person. It also contains natural ingredients like pippali and maricha which helps to increase your appetite and makes your body able to absorb complete nutrients of food consumed How to take: One capsule can be taken each in the morning and at night after half an hour of drinking Nutrigain. 25 gms of granules can be taken along with 200 ml milk (preferably full cream) after half an hour of having breakfast and dinner.. As far as your ankle pain is concerned you should exercise atleast 30 minute a day and wear good quality shoes as well..after 30 year of age wevlosses calcium from our bone the term is called osteoclast so you should increase your calcium intake as well and focus on exercise and proper diet...i hope this can help you...