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Nandrolone-Decanoate, or Deca is a 19-nor steroid that is based on the hormone Nandrolone and has tremendous power due to its intrinsic properties. The main performance enhancing effects of Deca is the growth of muscle tissue, increase in red blood cell count, and hemoglobin levels. Additionally, Deca lends in improving nitrogen retention and this can also lead to an increase in both muscle tissue and mass. Nandrolone is a very potent anabolic steroid that does convert slightly to estrogen, but does not have a very high aromatization like many other anabolic steroids. Deca is a Nandrolone compound bonded to the Deconoate ester, and thus it is a gradual acting compound with has longer lasting effects. This steroid has a half-life of about 2 weeks, and this is about as long as a half-life will be for any other anabolic steroid available. With Deca-Durabolin's long ester, the active hormone's positive effects won't really kick in until about 3-4 weeks after its first administration.

With Deca having such a long ester, it is the steroid with the longest detection time after being used, with a detection period of up to 2 years. If you're competing in a drug tested federation and are thinking of taking anabolics undetected, Deca is your worst possible choice. Stay away from this drug if you're being subjected to detection tests for anabolic steroids.


Deca's main benefits are size and strength. Therefore, it is predominately used within a powerlifter's "bulking" phase, and during a long training cycle in conjunction with testosterone. Another very significant benefit is that along with the increase of red blood cell count, Deca also promotes the increase of collagen synthesis. For powerlifters, this is godlike - Deca helps with joint pain relief, along with pain relief in tendons & ligaments. Just about every elite powerlifter who is enhanced has tried Deca at some point, and it is mainly for the benefit of managing joint pain while getting hammered through a hard training cycle.

In many cases this steroid will be administered during the beginning of a meet prep cycle and this strategy is used to grow muscle tissue and develop maximal strength throughout meet prep. A solid dose for Deca is within the range of 300-600 mg weekly, which is enough for most users to notice increased bodyweight and lean body mass gains. Again, the main mechanisms behind these gains are Deca's potential to retain nitrogen and to build muscle tissue. Therefore, those who use Deca will hold onto a larger Ouantity of nitrogen than when they are off-cycle. Being in this positive nitrogen state is a huge catalyst for growth, and this is why Deca remains a favorite among powerlifters. This muscle building process might be a bit slower when compared to stronger compounds (such as Deca's evil brother Tren), but it can ultimately lead to massive strength and muscle gains, along with an augmentation of collagen production.


Like many steroids on the market, Deca does come with a whole host of side effects. The most worrying side effect that comes with Deca is that it suppresses testosterone levels and like many anabolic steroids will stop the natural creation of testosterone within the testicles. Deca can suppress your testosterone levels and large doses can lead to a reduction in sperm production via the blocking of the pituitary follicle stimulating hormone.

Large doses over a prolonged period of time can also lead to a decrease in sperm ejaculation volume, an enlarged prostate, issues with passing water, priapism and over excitement sexually.

Deca can cause issues with electrolyte balance, nitrogen retention and calcium balance. lt has been reported that retention of nitrogen, sodium and potassium has also occurred when taking Deca and it is this process that places additional stress on the kidneys.

lt also has a negative impact on glucose tolerance and this can have a negative impact on the efficiency of muscle growth and can lead to type II diabetes.

Prolonged use of Deca can lead to life threatening liver diseases such as hepatic neoplasms and hepatocellular abnormalities.

Even at low doses there is a high risk of hepatitis, jaundice, abnormal liver function and liver tumours. This can lead to life threatening conditions, as prolonged use can be silent and then it can catch up with you with a bang via the development of abdominal haemorrhages.

Deca can still increase estrogen levels, despite it not being a very estrogenic hormone. Because it is a 19-nor steroid, Deca can increase prolactin. Prolactin is notorious for negatively affecting libido and healthy erection function. Along with having Cabergoline onhand to combat prolactin production, always be sure to run a sufficient amount of testosterone along with Deca. Deca is known to be extremely suppressive for natural testosterone production and running it without testosterone is a recipe for long term shutdown.

Unless you are willing to risk a very tough road towards restoring your test production, DO NOT run Deca in conjunction with Tren. Taking two 19-nor compounds in the same cycle will amplify suppression of natural testosterone production, along with increasing prolactin levels. Most users will not be able to run Deca together with Tren without facing issues related to side effects. I personally know of only 2 powerlifters who have been able to take Deca & Tren together without prolactin related problems, and it is solely due to having lucky genetics. Again, unless you are ready to roll the dice, don't use Deca and Tren together.

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