Highly debated topic.
Site injection is thought by some, such as Greg Valentino to be a way of directing anabolic action to a specific muscle.
Rich piana, another highly regarded bodybuilder who was open about his use said it was bs, and at best is a temporary inflammation of the injection site.
I have personally used biceps to minimize scar tissue in other areas; my conclusion is it did nothing, just a great place to shoot if your careful.
It’s easy to see what your doing, and can be done quickly with a very small needle. but it didn’t make my arms any bigger
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