Upjohn V, 1st Poke Results......?????

I did a shot of upjohn V today, and i didn't feel any burning.... i thought i was supposed to, my friend did a shot of it too, and he said it kinda stung while he was pushing it in.... our body's reactions are just totally different? or can this mean that my V might actually be fake?
I've done Spectro V b4 (which has overstated lables) and i remember that it stung a little bit when i'd inject, but with the upjohn i didn't get that feeling?

any ideas??

thanks

GM