Its more veins in the bicep, and more nerves. I hit nerves almost everytime I inject in my bicep and shoulder. its kinda funny when I hit them, the arm start moving by itself lol guess Im doing it wrong/going too deep or something.. Doesnt hurt more, but its harder to get the needle all the way in.
Test and deca can be taken in one shot as answered before. How about test and parabolan? Can that be taken in one shot?