It is 17aa, but when taken orally it goes through two liver passes to get into your system which leads to more stress. IM only goes through one pass, albeit still taxing the liver... but lesser of the two. Also not to mention you need roughly 50% more orally, so to equal a standard 50mg EOD IM dosage, you need to take 37.5mg ED orally. Personally, I would shoot it if given the two options.