All I can say is unless you've got something else you're going to mix it with while injecting is OUCH! I've been limping for nearly 7 weeks now. Just as one stops hurting it's time for another injection but, I'll be dmaned if I'll waste it. I've been told it's formt he higher BA content in the 50ml bottles. I can assure you that I will go with the 10's next time around & I will be mixing either EQ or Deca with it. I feel like someone has hit me in the quads with a baseball bat today. I'm doing 2cc (500mg) E Mon & Thur. The soreness seems to go away quicker in my quads than in my glutes so I hit them then hit my glutes about once every 2 weeks. If I react to the 10's this way when it's mixed, I'll be going back to Tornel T-200. It is good shit though & you should make good gains from it but, I would definately spend the x-tra dough & get the 10's.