..depends on the dosage, but as a rule, Intramuscular doesn't affect the liver as much as it doesn't get filtered like it does, well, if you eat it !
I saw a post recently by somebody who did 3 different cycles with
winny, 1st was drinking it, 2nd was using tabs, 3rd was injecting and he reported that with like for like doseages, the results were all very similar, so you can choose your method down to your preferences.
I chose to inject it, as I believe it to be less toxic on the liver, and as I was taking a shot, 2 days, off, next shot and so on, the frequency of jabs were ok.