Deca Dick: Myth and Truth Behind Nandrolone, Libido, and Erectile Function (All the Science)

[sciroxx-lab]

Deca-Durabolin (and its cousin, nandrolone phenylpropionate) are among the most popular anabolic steroids—and for a reason. However, they also come with a few well-known potential side effects. The most notorious is “deca dick.” I’m sure many have heard the term, but just so we’re on the same page, we’re referring to low libido, weaker erections, reduced sensitivity, and that general “disconnect.”


Now here’s the thing: almost every discussion online ends with the same one-word explanation—prolactin—and the same one-word solution—caber (Dostinex). Reality is usually more layered than that.


I just published a full breakdown that organizes the real physiology behind nandrolone and sexual function, without bro-science shortcuts:

Full article: Deca dick myth and truth
What the article covers (and why it matters):

• Why the “Deca = prolactin” explanation is not only an oversimplification, but far away from the truth.
• Why some guys feel better on cabergoline—without that proving prolactin was the root cause (dopamine effects matter)
• The true foundations:
  - Deca and its progestogenic / progestin-like.
  - The Deca-specific mechanism: nandrolone is converted to DHN (DihydroNandrolone → very weak androgen) vs testosterone is converted to DHT (DihydroTestosterone → the most potent androgen in the human body)
• So why overall you're under-androgenized where it matters most: penile tissue / prostate / brain
• Does Deca convert to Estrogen? and where estrogen really fits (Deca-only vs Deca + testosterone is often a completely different story)

If you’re considering Deca/NPP, already running it, or simply want to understand why this reputation exists, this is worth a read:


Full article: Deca dick myth and truth

 

[dieselbuilder]

It’s funny bc when I started deca (only done 100mg EW) I was worried about deca dick but instead I have a higher libido bc of it. Even at that low dosage I gained a little muscle, def some strength and my joints feel so good. My recovery is so good. I heal very fast.

I do get mental sides. No fun. I just spent a couple months without any masteron and it wasn’t fun. I just added it back in the other day.

 

[LATS]

Adding a bit of mast will reduce the prolactin also.. I found it could run deca to a point without deca dick if mast was in the mix..

 

[dieselbuilder]

Adding a bit of mast will reduce the prolactin also.. I found it could run deca to a point without deca dick if mast was in the mix..

Yea that’s why I added masteron back between the mental sides and like you said the prolactin. I am glad I hoarded masteron a year ago.

 

[BigBen1974]

Adding a bit of mast will reduce the prolactin also.. I found it could run deca to a point without deca dick if mast was in the mix..

Hey LATS,
When you say you could run Decca to a point without deca dick I assume you mean you could run the dose to a certain point and after that you would still get it? Thanks.

 

[LATS]

Hey LATS,
When you say you could run Decca to a point without deca dick I assume you mean you could run the dose to a certain point and after that you would still get it? Thanks.

Yes.. if i ran 300 or 400 deca I could counter the deca dick with 200 or 300 mast.. but.. diminished returns eventually would set it

 

[BigBen1974]

Yes.. if i ran 300 or 400 deca I could counter the deca dick with 200 or 300 mast.. but.. diminished returns eventually would set it

Ok good to know… it affects me worse and worse as I get older… Last time I even seemed to lower my blood pressure and just make me feel “blah“ immediately, even with 50 mg ofNPP…..

 

[BigBen1974]

Ok good to know… it affects me worse and worse as I get older… Last time I even seemed to lower my blood pressure and just make me feel “blah“ immediately, even with 50 mg ofNPP…..

Kazmeier once told me to load the syringe with NPP and hit it three times a week when I was first starting out and asking him questions when I met him… He also said I could load the syringe with winstrol and hit it three times a week… seems like that would kill the joints… I don’t know if he was serious ortrolling me with an Arnold “tablespoon of salt“ trick…

 

[LATS]

Ok good to know… it affects me worse and worse as I get older… Last time I even seemed to lower my blood pressure and just make me feel “blah“ immediately, even with 50 mg ofNPP…..

Yeah nandrolone got to a point that it wasn't worth it to me anymore..

 

[Gaintrain]

every drugs effects everyone differently, I have never had any issue with DECA or TREN in regards to ED....