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For decades, intramuscular testosterone has been the unquestioned standard. It’s what every early study used, what most doctors still prescribe, and what nearly every patient starts with. It works. No one disputes that.
But over time, as more research and clinical experience accumulate, the story starts to shift. The deeper you look into the physiology of absorption, the clearer it becomes that where testosterone is injected changes how it behaves once it’s in the body.
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