I understand your point for sub-q, I meet more and more people who dont do well on sub q like me, sub Q JUST DOESNT WORK FOR EVERYONE.
Some people on this forum continue to claim that is not the case and people like us are some very rare exception. This can be a decisive misinformation for people just starting therapy.
As much as Im confident IM is the superior and more reliable delivery system, for me daily IM injections are not sustainable. I was rotating 8 injection sites and after 2 months I've had a lot of pain all over them. However IM NOT doing shallow IM, but deep IM with 3/4 inch needle. I think shallow IM also doesnt work for many people like sub q, and depending on your body fat percentage you may very well be doing sub q injection thinking you are doing IM.
However if you do your IM with 1/2 inch needles now and it works for you then shallow IM works for you and thats great. SUB Q works well for some people and great for them, if it works, doesnt cause nodules and other bad reactions it is definitely better long term than IM.
If you are going to do shallow IM daily I again suggest you use AT LEAST 4 injection sites, better 6 or 8. You can inject for example in delts, ventroglute, glute and quads and you have 8. Dont do pectorals(its too risky and dangerous). Some people do in biceps and traps, I think both of them are very painful. Some also do calves, it was too painful for me as well(I've tried injecting almost everywhere

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So if you are doing now 3 times a week, for how long have you been on this protocol and what ester are you using? I know there are people who find befits on daily injections with cypionate and enanthate, but I think most would feel the same on EOD or MWF. However yes, some do. On the other hand if you have started this protocol 2 weeks ago it would be totally normal to feel different on injection days, but that can settle in 2-3 more weeks.
For example when I started sustanon from enanthate injecting it EOD for a whole MONTH I was feeling better on injection days, but now really there is no any difference. Due to that when I've fully optimized my thyroid I will try to do the sustanon every 3rd day..