It is important to note that Biotropin HGH  is a delicate molecule, and vigorous shaking or high temperatures will destroy the amino acid bonds, making the hormone ineffective. Therefore, Biotropin HGH must be always handled with care. It needs to be refrigerated at all times. In its freeze-dried form,  HGH has been found to possess a shelf life of approximately 18 months. Ensure that the vial containing the powder is not exposed to extreme heat  or extreme cold temperatures as these will destroy the molecule and will render it inactive. When reconstituted (mixed with sterile water or bacteriostatic water), the shelf-life of Biotropin HGH  drops. Your package will include free bacteriostatic water  (water with a small amount of benzyl alcohol added for sterilisation and preservation). Once mixed with the powder, your Biotropin HGH will possess a shelf-life of approximately 2 weeks to 20 days (Refrigerated).