I believe Brian Hill (founder of OCF & all around good guy) has experienced nerve damage from radiation, if I remember correctly so if that's the case then yes I've heard of it. I have had chemo so my memory could be suspect.

I'm surprised you were ordered to have shots of b12 as its readily available in sublingual tablets in varying doses. It will make you feel great in any case as b12 is a main ingredient in most energy drinks. I use it as part of my supplement regiment to keep me running and get the 2500mcg sublingual tablets at Costco for cheap.

Eric