In order to reach AR in target organs(muscles) it has to get into bloodstream first. Then, like everything else, it has to pass through liver. 17-AA makes difficult for liver to metabolise and excrete it.
Inject or drink, same results.
Does the fact that it's 17AA not mean that it has to go through the liver to be metabolised regardless of wether it's absorbed through the muscle or the G.I. tract!
In order to reach AR in target organs(muscles) it has to get into bloodstream first. Then, like everything else, it has to pass through liver. 17-AA makes difficult for liver to metabolise and excrete it.
Inject or drink, same results.
Because the depot is usually cheaper than the tabs! You buy it ,you drink, same effect, less money spent, and no risk of infection from injections (especially if it's vet grade).