Why the hell would you inject into your wrists? Besides the fact that both of those areas are webbed with veins why wouldn't you rather inject deep into a thick muscle like delt, glute, or even bi's and tri's!
Are you talking about cortisol shots? If so, then yeah, if you got a problem w/ our wrist, then by all means. But you should have a doctor do it, there is no reason you should have to self adminster! And no, never injected in the hams. - josh
forearms are full of veins and nerves, it would be impossible for me not to atleast nick one. I would go calves before I ever thought about hitting forearms.