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Greetings for the day!!!       The testoterone levels you have mentioned is normal for men. The normal values range from 249-836 for male upto 49yrs. So you can definitely do muscle building.     Regarding Shilajit capsules, apart from other compounds it contains 5% steroids that could affect your body. Another reason to avoid is that, results produced with any kind of supplements are short term. Once you get back to your original routine you would loose all the results. Continuing to take the supplements for longer can affect vital organs like liver and kidney.      For muscle building the ideal method will be to have a well balanced diet customized according to your requirement with appropriate weight training exercises.     I personally do not suggest any supplements.