Deca Dick: Prolactin Myth vs Real Mechanisms (DHN, DHT, Progesterone, Estrogen)

[Sciroxx]

Deca-Durabolin (and its cousin, nandrolone phenylpropionate) is among the most popular anabolic steroids—and for good reason. But like any potent compound, it also has a few well-known potential side effects. The most notorious is “deca dick.” Most of you have heard the term, but just to make sure we mean the same thing: low libido, weaker erections, reduced sensitivity, and that general “disconnect.”


Here’s the issue: almost every online discussion ends with the same one-word cause—prolactin—and the same one-word “solution”—caber (Dostinex). In reality, it’s usually more layered than that.


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


Full article: Deca dick myth and truth


What the article covers (and why it matters):

• Why “Deca = prolactin” isn’t just oversimplified—it’s often far from the truth
• Why some guys feel better on cabergoline, without that proving prolactin was the true root cause (dopamine effects matter)
• The true foundations:
  
  • Deca and its progestogenic (progesterone-like) effect
  • The Deca-specific mechanism: nandrolone → DHN (dihydronandrolone → very weak androgen) vs testosterone → DHT (dihydrotestosterone → the most potent androgen in the human body)
• Why you can end up 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