Buy Genotropin HGH is e.coli-derived and identical to the natural hormone produced in the body. Genotropin is one of the most convenient to use HGH devices available. It is packaged in paper cartons containing ready-to-administer devices and is available at various strengths. Storage: Store at 2 °C to 8 °C refrigerator ( 39-46 °F), protection for 1 year (until the expiration date) At room temperature (up to 37 degrees °C ) you can keep the product for 30 days, at a maximum of 45 °C you can protect the product for a week.