Hello Thank You for contacting HCM. Welcome to Health Care Magic. My name is Dr Muhammad Ahmad & i will look into your problem. I have gone through your query and would try to help you in the best possible way. 1-Make sure your Body doesn t have a disease specially thyroid or an intestinal issue.Get a general body check up. 2-Take high protein diet . 3-A two hour hard physical exercise every day ( however you can divide it into two portion , one hour in the morning and one hour in the evening ) like morning or evening hard walk or a visit to gym will yield results within 2-3 months . 4-But as your body is thin so visit a gym and instructor in gym will advise you how to strengthen the muscle with mass build. But during this period you have to eat high protein as well as fat. 5-Please Don T try over the counter products from brands and vendors which are not authentic they usually contain steroids and heavy metals which can have very bad side effects. 6- Don t Take steroids. 7- Stay persistent ,no big change is created in just one or two weeks do good gym and hard workout for one year consistently with full heart then see results. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. Wishing you good health.