Isn't is possable to put some alcohol into the vial. Mix it around till it touches 100% of the interior. Then put in the powder hormone and sterile water (0.9% Benzyl Alcohol). Put on a cap and there you go.
The remaining Alcohol should kill all the bacteria and viruses in there.
Hell, why doesn't everyone just get a Ultra Violet Light and sit it under it for a day or so? UV kills everything, they do that to clean drinking water...
Does UV light degrade the Hormone?...