I started IGF-1 yesterday and injected in my pec.During the injection it burned while going in and I still have a little pain today at the injection area.This morning I just injected in my bicep and the same results occured.The pain is not unbearable,it's just that I haven't heard of anyone else complaining of this and was wondering if it was normal?Two of my friends are using a different brand of the same and are not feeling this burn so maybe it's just the brand.