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First of all, I just bought Nelson's Testosterone book and already read most of Dr. Crisler's book, so perhaps I'll find some more content related to this question as I finish reading them.  Thank you Nelson for responding to my first thread here by the way.  Your commitment to this forum is really commendable.

On to my question...I have seen a few mentions of gels causing higher DHT conversion, and that switching to injectable test lowered DHT levels for many people with roughly equivalent test levels.  Dr. Crisler's book states that he prefers gels (and I realize that this could be patient dependent) because they lead to more variation in hormones throughout the day which we see in young, healthy men.

I'm just curious if there are studies comparing how gels v. injections affect DHT levels.  This is obviously very relevant to men with thinning hair who would prefer not to rapidly bald on TRT.

I will note that Dr. Crisler's book mentions that there is evidence of less DHT conversion when higher concentration gels are applied to smaller surface areas of skin, but he suggests that there is no published study on this and it appears to be more anecdotal information.