Welp that's not it but their is a lot more info in this one than the first. Seems that info was not easy to find till it made it to Pubmed more recently. You may find this thread about it an interesting read - https://www.canadianbrawn.com/threads/im-vs-subq-study.7095/I’m fairly certain it was this article and it was listed as a source it’s been a few weeks since I read it
An Important Bulletin for TRT Patients
How to easily wipe out the possible negative side effects of testosterone replacement therapy with one simple adjustment. I’ve written before about how subcutaneous (under the skin) injections are more convenient and less problematic than intramuscular injections for men undergoing...www.t-nation.com
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It seems to have an opposing view to what you gleaned from the first one you posted "After linear regression, type of TRT modality was not found to be associated with TT levels (p=0.057). SCTE-AI " but even that is some special kinda bullshit, they were comparing Cypionate to Enanthate for some reason that I can only assume is prompted by money, as they are probably trying to sell the auto-injector they used for TE.
The only thing that really changed was Estradiol and Hematocrit were slightly higher post treatment in the Cypionate/IM group compared to the Enanthate/subQ group, likely because of higher peaks in the IM injected group.
So the question is were the differences because of IM vs SC or Cyp vs Enth ? No way to tell other than to hypothesize.
IMO the only thing that might possibly be learned here is that this may provide some backup to something important that I love to mention often "it's the peaks that get ya". In my mind that is one of the stronger arguements for higher frequency injections and also probably for SC injections for TRT. Just my opinion about the SC part though, I've still seen nothing that proves it and my own experience has been no significant difference.