Should probably still be mostly ok. When the igf is shaken or stored in destructive environments, the delicate polypeptides will break or get denatured at a percentage per time. You probably damaged or denatured a percentage of the peptides in it, but only a percentage. maybe you made 20-25% of it inactive, but its unlikely that 5 hours would completely destroy every single igf-1 polypeptide molecule inside.