“Deca dick” is a term used to describe the propensity of Deca-Durabolin (Nandrolone Decanoate) to cause erectile dysfunction, even when one is using a test base and has a healthy sex drive, positive mood, and high energy levels.
As you know, Testosterone 5-alpha-reduces into a highly androgenic metabolite known as Dihydrotestosterone (DHT), which is responsible for sex drive and sexual function in men.
Similarly, Deca also 5-alpha-reduces into a metabolite known as dihydronandrolone (DHN). The problem, however, is that DHN is barely androgenic, meaning that it does not stimulate sex drive and sexual function like DHT does.
When one is using, for example, 200mg/week of Testosterone + 400mg/week of Deca, DHN dominates over DHT. Because it is barely androgenic, it is unable to stimulate sexual function, leading to “Deca Dick”.
The solution? You should always use a Test dose equal to or greater than your Deca dose. This is the only way to guarantee that your DHT levels can offset your DHN levels and exert their androgenic, pro-sexual function properties.
But this is not the only mechanism by which Deca causes erectile dysfunction. As you may know, Deca has progestogenic properties, meaning that it can increase prolactin levels.
Prolactin is often referred to as a “female hormone,” and it can cause sexual dysfunction, gynecomastia, lactation, and lethargy when it skyrockets.
Therefore, when running a high dose of Deca, one should not only ensure that the Test dose is equal to it (or greater), but also use something to combat high prolactin levels.
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