The first thing to consider is that correlation does not establish causality. It is possible for libido to wane under TRT even without a change in protocol, and even after some long period of doing ok. But if you want to assume cause and effect then the only difference in the protocols is in the rates of absorption. On the same dosing schedule, IM injections should give somewhat higher peaks and lower troughs in serum testosterone. While it's not totally implausible that this would affect libido in a positive way, generally guys are reporting worse results overall with protocols that involve larger hormonal swings over many days, such as with the weekly injections you're doing.Just wondering...what is the reason that subQ could be the cause of disappearing libido and ED? I have been injecting subQ for the last few months...seems much more convenient but I have noticed a drop in libido. Never thought it could be the means of administration.