Propylene Glycol is a carrier liquid for the vaccine.
It is a common ingredient in ice cream (to make the ice cream not freeze too hard) and was a major component in vaping.
Propylene Glycol has a freeze / melting temperature of -74 deg.F.
I can see holding the vaccines in frozen state down to maybe -80 degrees F.
Anything colder doesn't make much sense.
Propylene Glycol is a carrier liquid for the vaccine.
It is a common ingredient in ice cream (to make the ice cream not freeze too hard) and was a major component in vaping.
Propylene Glycol has a freeze / melting temperature of -74 deg.F. I can see holding the vaccines in frozen state down to maybe -80 degrees F.
Anything colder doesn't make much sense.
It also may be responsible for some of the adverse effects.