If its in a large quantity its very hard to separate and will probably die, any more than 15i.u. in a vial is useless in my opinion, mixed with sterile water it will last 48 hours with bacteriostic water 5-7 days maximum. If exposed to air it will be destroyed, so basically if you don't have a very good lab to separate it then you will probably not get much good from it. How m uch do you have in a vial?