Androgel, with other synthetic or animal androgens cannot emulate the human testosterone fully. Humans are the only animals with permanent breast mounds. The other mammals have "bags". The human testosterone has a breast suppressor quality in its molecule and that binds to the receptors in a certain way in the breasts, inhibiting their growth. If a man takes androgel or the other androgens too much, the pituitary gland will detect this and will excrete a hormone telling the testes to shut down production of testosterone. The pituitary regulates a lot of the hormones in your body.
The same is true to men my age when the production of T decreases in their 50's. Gynocomastia is prevalent here. A lot of these fellows are larger than what I try to accomplish. If you already have breasts, the androgens you are taking will not increase what is already there. There are warnings not to apply these topicals directly to the chest, including the estrogels.
Joelene