Male contraceptive trial about to start in Scotland.

"The bi-monthly jab combines testosterone and progesterone. The addition of the progesterone hormone makes it possible to use less testosterone and also helps make the effects last longer than previous versions."

I'm guessing this lastest injection is a combo of testosterone undecanoate and progesterone. I'm wondering if the progesterone is really needed or just in there to make it less attractive to those wanting to use it for musclebuilding purposes. Progesterone will of course make unwanted side effects such as gyno and bloating far more likely.

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