2 minutes in and he's talking about how scientist get exogenous testosterone from Mexican wild yams... (I did not know that! Im doing some research and can't find anything on this) Now they're figuring out a way to extract the testosterone from animals, theoretically it makes sense but hasn't been proven yet. Check it out.
https://youtu.be/q4opT0ftAgc
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https://youtu.be/q4opT0ftAgc
Sent from my iPhone using Tapatalk

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