Standard 'I am not a medical professional ’ disclaimer
Attempt at your own risk/YMMV
Very brief (deca specific) background. My first cycle was a retardedly high dose, short duration cycle of Sustanon 250 (pyramid to 1000/week then back down to 500/week over the course of 5ish weeks-this was 99, so memory may be off slightly, but it was definitely a short cycle) combined with Deca (going up to 600/week in the same time frame). No PCT, no ancillaries. Again, this was the late 90s, I don’t recall if bros were even doing PCT back then. How I kept full function of my junk and fathered two healthy kids is beyond me. But anyway. 600/week of Deca with no ED issues (massive dose of test probably helped, just sayin).
Tried MHN orals in the mid-teens (years, not age), got some glandular swelling in the pec which went away upon cessation. No ED issues.
Then, beginning of this year, I had been thinking about and reading about a low dose Deca cycle to help with joint issues, and went on it (only other hormones was TRT dose of around 120/week test E). IIRC, I was taking 150/week, lost track of time and ended up doing this for 12 or so weeks. Started having floppy cock issues. For context, I was overseas during this time (away from the wife) so was consuming an inordinate amount of porn, and initially chalked it up to that. Then got home, and was still having performance issues, now with the wife. Did some reading, realized what I had done, and did some more reading on how to fix it.
My research uncovered a few things which chained together to help correct the issues. First, DHT is believed to be the hormone most responsible for erections. Testosterone is converted by 5AR into DHT. DHT in proper levels keeps lead in the ol’ pencil. DHT in high levels attacks the prostate and hairline.
Deca displaces DHT (best description of what it actually does without writing a lengthy article) through conversion to DHN, one of the articles I read (which I can’t find now, go figure) mentioned it may actually reduce DHT levels through another mechanism. If you have read any of the stuff on deca dick, there has been all kinds of conjecture on what mechanism is at play for deca causing ED (prolactin, progestin, etc.). From what I read, it looks like reduction/displacement of DHT may be the actual culprit.
So what now? In my continued research, I accidentally came across an article talking about how creatine use raises DHT levels (google it, easy to find, seems to be pretty well known in the literature) during the loading phase. So, I went and bought some creatine (hadn’t been using it for some time). Did an old school 20g/day loading phase, and voila, good solid erections with no other assistance.
*For context, I was taking cialis periodically while I was trying to figure out what was up, and continued while I was researching how to fix it. Once I got on the creatine, I stopped using it.
Again, this is based off of my own reading of other people’s research and writing, and me taking the (to me) logical next step. This worked for a while, but each time I tried stopping the creatine, right back to floppy cock issues, so I continued with the creatine until I started the 600/week primo cycle. Primo being a derivative of DHT, it seems to have gotten my levels back up to where they belong: everything is working as good as can be expected in my late 40s.
Do I think this is a cure-all? No idea. But ED went away while on the creatine, and the primo cycle seems to have been the final fix. Again, YMMV.
TLDR: DHT is responsible for erections, deca reduces/displaces DHT, potentially being the reason behind deca dick. Creatine loading phase increases DHT, as does a DHT-derived androgen cycle (such as primo).