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There is really no drug or hormone for general weight gain. Growth hormone is very expensive and has lots of side effects, so should be reserved for medical needs. The growth hormone you see advertised on the Internet is not real GH. If it was it would be illegal to sell, as it must be prescribed by a doctor, probably a specialist. If you are not having results gaining through eating more and exercising, check with a registered dietician who can see how many calories you're really taking in. Just eating until you're stuffed may not be eating the right things.