Well after reading comments I now know what you're talking about and my advice is stay away from that shit.

When you take hormones what you are doing is sending a message to your body to stop producing those hormones.

I'm diabetic and insulin is much the same.

If you give insulin to a non diabetic, eventually their pancreas goes "oh fuck there's already plenty of insulin I can stop making it now"

If you take testosterone your testicles go "oh fuck this body is already full of testosterone, looks like we can stop making it"

And your body will also make extra estrogen to make up for the high test levels.

Then you stop taking the test and what happens? You practically become trans gender because your body is making shitloads of extra estrogen and not making any testosterone