By Australian IGF do you mean GroPep/Novozymes? Where did you hear that Australian IGF is better? I think they say that theirs is receptor grade (with a purity of 95% and greater) but that doesn't mean that others aren't good. IMHO, the best IGF would be one that was vacuum sealed in freeze-dried form in 100mcg vials or even smaller. In this form it should last around 2 years at room temp.