It completely depends on the type of andro you are considering. Some of them are a waste of time. Others (specifically the newer varieties) can be pretty incredible. You will need to do some research on the specific types and what they can offer before buying and taking any.
Some of them like plain androstene-dione will do exactly as already posted: contribute to bodyfat. However, keep in mind that although estrogen is one cause of man-breast development, it is not very common with regular andro unless you are predisposed to it (in other words, if you already have any chest/pecs fatty accumulation to begin with). Also be aware that estrogen can be quite beneficial if you are wanting to add size. Those that don't aromatize (aromatize=convert into estrogen) typically promote lean muscle development and bodyfat loss, while those that may aromatize promote overall size. It is also important that you find the right andro for your needs. Gyno (man-breasts) can develop with continued andro use without a break. You will certainly not develop gyno if you cycle it properly. So if you use it, learn how to cycle it on and off and what types of supplements you should be taking during an off cycle. This is definitely not a supplement to take by itself without a break or without countering supplements when you go off.
It also depends on your age whether you should take it or not. Teenagers and older men shouldn't take andro unless cleared by a doctor.
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