Nandrolone Decanoate , also known as Deca Durabolin or Deca, is perhaps the second-best known injectable anabolic steroid after testosterone. It seems that almost every steroid novice and many who are experienced with steroid cycles believe that for best results they may need to include Deca. 

>> Chemical Data:

Alias: Deca, Nan Deca

CAS ID: 360-70-3

M.F.: C28H44O3

M.W.: 428.65

Purity: 98.13% by HPLC

Standard: USP32/BP2003

Melting point: 33.5~35°C

Appearance: white or oyster white to pale yellow crystalline powder 

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Deca is a very nice anabolic, causing nice (albeit slow) gains in quality muscle.

Studies shows that, Deca impoved collagen synthesis and Deca Durabolin increased bone mineral content.

Deca Durabolin (and Nandrolone in general) doesnt produce many estrogenic or androgenic side effects. This is because Deca Durabolin has a very low rate of aromatization (conversion to estrogen via the aromatase enzyme), roughly equal to 20% the rate of Testosterone.Deca Durabolin also has a very long active life. 

The unusual properties of Deca Durabolin are due to its parent steroid, nandrolone, also known as 19-nortestosterone. One of the principal positive qualities of nandrolone is that it has relatively low conversion to estrogen compared to testosterone.

In earlier years, testosterone and nandrolone were the only pharmaceutical injectables that were both widely available to bodybuilders and economical. Estrogen control did not then exist. For this reason, Deca’s low aromatizing properties were then quite useful. Deca therefore won wide popularity.

Unfortunately, Nandrolone Decanoate usage very commonly has the adverse side effect of interfering with recovery of natural testosterone production after a steroid cycle. Adverse side effect on libido and/or erectile function is also common, but typically only when dosage is at least 200-400 mg/week or when the drug is used alone at any effective dose. Problems are worse when Nandrolone Decanoate is not combined with testosterone or substantial doses of more androgenic compounds such as trenbolone, Masteron, or Dianabol. There is wide individual variability in response with regard to side effects on libido and erectile function. Depression of mood is also possible.

For these reasons we generally recommend against Deca Durabolin use except where the athlete already knows that he can experience joint relief from the compound, or he wishes to see if that will be the case for him and he understands the possible adverse side effects. I prefer for Deca use to be as low as is effective for any such joint problems, and for the majority of the total steroid dosage to be from other compounds.

The long half-life of the drug results in slow clearance. For this reason, Deca Durabolin is unsuited to short cycles or where drug testing is a possibility. I also consider the drug a poor choice for women due to being at least as virilizing per milligram as most other anabolic steroids except testosterone and taking too long to clear if side-effects occur.

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