GH in powder/granular state

Help me out on this one. I have recently been informed that GH in powder/granulated form need not be refrigerated at all. Only after it is reconstituted does it need to be refrigerated. Is this correct or is my source full of it?

It is stable at room temperature but is preferably refrigerated. Extreme temperature changes will negatively affect the protein and you have no idea what that vial has been through. After reconstitution it needs to be refrigerated and each brand has a different shelf-life.