I never hold regret with anything in life but fuk, my first Prop blast @ 50mg ED had me as a crippled handicap for the better part of 9 weeks. I even called in 2 days because I couldn't make it out of the door and down the stairs. The preservatives in that batch were no good. Since then, I've always substituted Test Prop for Test Acetate and that always did the trick. Remember though, there are several ways to prevent painful gear and remedy pain once it sets in.