When did an AI start to increase muscle mass?
Why arent BBs using an AI for muscle mass?

Do you know what happens when you take an AI?

At first it will increase test levels...maybe a week ot 2 the most.
But then your negivate feedback loop will kick in and shutdown your HTPA and surpress the making of test.

The same thing happens when taking steroids, the difference is you adding test and have control on how long you want your test levels to remain high.