I'm on week 2 of sust cycle. First week was horrible. Every injection site had a reaction. Quad and glut injections I could barley sit or kneel down. With Delt injections buy day 3 my arm was red, tight skin, warm, and had swelling to elbow. Looked into it and the gear I was using had Ethyl Oleate. Got new gear from another source, haven't had any issues since.