We are not supposed to discuss UG lab names. Bro if you shot 2ml in your thigh and it was in pain why would you shoot 2ml into your bicep???? Stick to larger muscle groups, I dont know what else your running but if you have to split it like 1ml left thigh, 1ml right thigh that might help alot. Alot of UG stuff is painfull just the alcohol in the gear. I am running human grade primo it is completely painless.