Anatomy of muscle growth:

Ninja Nerd Testosterone -https://www.youtube.com/watch?v=zJt8yzR2aoY

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MedCram Hormones -https://www.youtube.com/watch?v=nf8q4N3J5G4

Growth Hormone Review -https://academic.oup.com/edrv/article/35/3/341/2354671