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~ AlphaMD Most men start testosterone replacement therapy to feel stronger, sharper, and more like themselves again - but nobody signs up expecting to watch their hairline move

Injection : The injection is administered intramuscularly, usually in the upper arm or thigh
Huang X, Gai Y, Yang N, Lu B, Samuel CS, Thannickal VJ, et al

Choosing between them depends entirely on which hormone pathways are central to your experimental design