Yoda is pretty much on point with his statement... The only thing I'll add to that, is that when taken by injection, the compound is filtered at a lower rate, through the liver(thus slightly lowering hepatotoxicity from a bolus dose.... But the same amount of compound still has to be metabolized by the liver, just at a different rate than orally). Also, to clear up yoda interpretation of liver metabolism, ph are metabolized by liver in the same ways as aas. There is extensive metabolization by the liver, and by other organs/tissues... It's more than a 'one pass' or 'two pass' type of system... Either way, it's very similar for both ph and aas...