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Hey bro I've shot every type of test deca etc.. with a damn insulin needle 29g with a half inch needle without heating or any type of warming. You just have to push hard and steady. Insulin needles are great for spot injection such as tri's , bi's or any where there is a small muscle and it's absolutely painless! You don't even feel it. I was always against using insulin needles but now I love them!! (You cannot use an insulin needle in any large muscle group, it won't get deep enough into the muscle
Good luck bro.