DHEA = MAYBE
Pregnenolone = MAYBE
Here's my spin..........
PS: I am also on TRT so the following insight/opinion from a shared perspective as well
Replacing endo test with exo test is not an apples to apples scenario in my opinion like so many subscribe to.
Think about this, you are still producing endo test to some degree (unless you were castrated? LOL). So, these pulses/signals have many feedback loop and compensatory reactions or/on MANY other hormonal processes.
Simply adding exo-test does not "fill in" these processes as you will be impacting your HPTA.
All of these "messages" are "countered/comnpensated for/offset" by other hormonal processes.
Messages are inevitably lost in this equation as YOU are now "controlling" the systems (by adding to/manipulating your test levels) whereas before, your body did.
Being parent hormones, capable of "filling in gaps where needed"; Pregnenolone has its place
FOR SOME, as does DHEA.
The PROBLEM is once again, controlling unwanted reactions (conversions) into excessive estro, DHT, progesterone, test or others.
In cases when Test fails to make people feel "normal" or like they felt as young adults (or whenever T levels were optimal for that person), then perhaps DHEA and PREG can be of some help. As ironic as it sounds, some TRT patients get adverse effects from Exo-test like depression/moodiness/irritability, etc.
Contrary to popular opinion, not everyone feels like an Adonis/Alpha Male just b/c test was added.
Once the TEST (all forms, along with estro, DHT and prog) levels are checked and deemed to be appropriate for that individual, then substances like DHEA and PREG "can" fill in certain gaps where needed.
People need to remember that the body's endocrine system is UBER complicated and IMHO, it's epic failure to just "sprinkle in some TEST and pray for the best".