It needs to be frozen... if you have a lab freezer that goes down to -40 degrees that is ideal, but if all you have is a home freezer, OK. Also try and keep moisture away from the vials.
It needs to be frozen... if you have a lab freezer that goes down to -40 degrees that is ideal, but if all you have is a home freezer, OK. Also try and keep moisture away from the vials.