Deca Durabolin [Nandrolone]: Benefits, Uses, Side Effects

The unfortunate yet hard truth in the sport of bodybuilding, is that the sacrifice to win, is directly related to your willingness to use androgenic-anabolic steroids (AAS). One of the most common, Nandrolone, also known as 19-nortestosterone and by its brand named Deca-Durabolin, or simply as “Deca”, is a modified and synthetic form of testosterone, used to increase muscle size, strength, and enhance performance. In this article, we will analyze and examine the uses, benefits, and side effects of deca and how it works.

What Is Deca Durabolin [Nandrolone]

Deca, is an androgenic-anabolic steroid (AAS). All AASs are derivatives and molecular modifications of the endogenous hormone testosterone. Deca is a steroidal selective androgen receptor modulator (SARM) and is part of the 19-nor testosterone (nandrolone) series of compounds. Removal of the 19 methyl increases anabolic to androgenic activity, in this series of compounds.

Nandrolone esters were first described in the late 1950’s when other anabolic and steroidal SARMS were being investigated.

Nandrolone esters, have been used in investigational studies to treat indications associated with muscle wasting (cachexia and sarcopenia), HIV/AIDS, as well as osteoporosis and breast cancer.

How Does Deca Work, What Does Deca Do

Unlike the 17α-alkylated steroids (such as Winstrol and Anavar), which are orally bioavailable and already 5α reduced, Nandrolone is reduced by 5α reductase in target tissues to a less potent much weaker androgen receptor ligand, 5α-dihydronandrolone (DHN), which has both reduced biding affinity for the androgen receptor relative to nandrolone in vitro and weaker AR agonistic potency in vivo [R] but it is less susceptible to aromatization to estrogen.

Deca is not potentiated in androgenic tissues such as the skin, hair follicles, and prostate gland. This results in less virilizing effects, and a greater ratio of anabolic to androgenic activity.

The lack of alkylation of 17α-carbon makes nandrolone less hepatoxic, than oral steroids.

Unlike many other AAS, a unique characteristic of deca, is that it is a potent progestogen. It binds to the progesterone receptor (PR), with approximately 22% the affinity of progesterone. The progesteronic activity of nandrolone augments the antigonadotropic effects as antigonadotropic action is a known property of progestogens [R]. 

Deca is a steroidal selective androgen receptor modulator or agonist, meaning it has high binding affinity or tissue-selectivity for muscle and bone. Stimulation of the androgen receptor, produces anabolic effects, increasing muscle protein synthesis. Thus, deca is highly anabolic, producing gains in muscle mass and strength. 

Deca Benefits

Increased Lean Body Mass

AASs were created as a potential alternative to testosterone, to have more anabolic and less androgenic effects. Anabolic androgenic steroids like deca, potentiate androgen receptor activity and have high tissue selectivity for muscle and bone. nandrolone esters are thought to have the highest ratio of anabolic to androgenic effects of any AAS [R].

In a clinical setting nandrolone is applicable in clinical practice for burns, radiation therapy, surgery, trauma, and various forms of anemia [R].

Off label however and illicitly nandrolone is used to preserve lean muscle mass and applied to medical conditions such as cachexia and sarcopenia, associated with AIDS and HIV [R].

Nandrolone deaconate, administered every 2 weeks at a therapeutic dosage of 100mg, showed increased weight, lean body mass, and quality of life increases in patients with HIV/AIDS [R].

Increases Bone Mineral Density

Selective androgen receptor modulators or agonists, like deca, also have a high binding affinity for bone. AAS have been thoroughly investigated for conditions like osteoporosis. Studies show that therapeutic doses of 50mg via intramuscular injection, every three weeks, showed significant increases in bone mineral density and reduction in bone pain [R].

Androgens have direct mechanistic action on osteoblasts, stimulating bone formation.

A 2-year a double-blind, randomized, placebo-controlled trial, investigating the effects of nandrolone nandrolone decanoate (ND) on bone mineral density (BMD), found that deca increased bone mineral density, hemoglobin levels, and muscle mass, and reduced the vertebral fracture rate of elderly osteoporotic women [R].

Deca Side Effects

Typically, anabolic steroids are taken in cycles of about 6–12 weeks (the ‘on period') followed by a variable period off the drugs, from 4 weeks to several months (the ‘off period') in an attempt to reduce the likelihood of undesirable effects but some bodybuilders will take them almost continuously.

At therapeutic dosages, AAS can be relatively safe, however, used in a performance enhancing method at supraphysiological doses, can result in many adverse effects.

Since, using performance enhancing drugs like AAS is a clandestine activity, bodybuilders and recreational athletes are making subjective decisions of dose and effect, based on little to no investigation, or based upon misinformation, often easily accessible via social media.  

Common acute side effects of nandrolone or deca use include

  • Headaches
  • Diarrhea
  • Nausea and vomiting
  • Trouble sleeping
  • Mood changes, particularly stress, irritability, aggression, and depression 

Long term chronic side effects of deca include

  • Cardiovascular disease
  • Increased cholesterol (LDL) and lowered (HDL)
  • Androgenic effects such as
  • Change in testicular size
  • Acne
  • Male pattern baldness
  • Changes in libido and sex drive

Since deca is administered intra-muscularly, it disassociated with less hepatoxic effects, than oral steroids, or 17α – alkylated steroids.

Deca will result in lower and suppressed testosterone levels, therefore, post cycle therapy is recommended to optimize hormonal levels and balance.

Studies have shown that deca is much more anabolic than testosterone. A randomized controlled trial comparing testosterone vs nandrolone, analyzed  303 adult males with HIV and were randomly assigned to receive nandrolone decanoate (150 mg), testosterone (250 mg) or placebo intramuscularly every 2 weeks for 12 weeks. Treatment with nandrolone resulted in significantly greater increases in fat-free mass and weight when compared to testosterone and placebo [R].

Deca Nandrolone: Takeaway

Deca is one of the most anabolic AASs, and is one of the most studied showing high binding affinity and potential for muscle mass, strength, and improvements in physical performance. 

Although nandrolone is highly anabolic, it does suppress natural tesosterone levels, and can create hormonal imbalance. Nandrolone is reduced by 5α reductase in target tissues to a less potent much weaker androgen receptor ligand, 5α-dihydronandrolone (DHN), which has both reduced biding affinity for the androgen receptor and aromitization to estrogen. 

Taking AASs at supraphysiological doses, can cause adverse side effects. 

Disclaimer: Swolverine does not condone the use or sell steroidal or non-steroidal SARMS or anabolics. The contents of this article are for informational purposes only. Deca is not for sale in the United States for off label use. Possessing, using, or distributing these substances may lead to serious legal consequences. Deca and nandrolone esters are on the WADA prohibited banned substance list and will cause a failed drug test.

Need Help With Optimizing Your Diet, Nutrition, And Training Plan To Finally Get The Results You've Been Waiting For?

The Swole Kitchen provides 1:1 nutrition coaching, macro coaching, and custom meal plans to help guide you to becoming the best version of yourself. We teach you how to enjoy the foods you love in the right amounts, so you can fit into your favorite pair of jeans, hit your health and fitness goals, and be healthy and happy. We guide you through making sound nutritional decisions and teach you along the way, so you can learn how to take control of your health, and discover what if feels like to live again.

We believe that everyone can optimize not only their athletic performance but their human potential. The way we believe we can optimize performance is through transparency, clinically effective doses, and clinically proven ingredients with evidence-based outcomes. We provide the nutrients you need to power your active lifestyle.


Featured products

Rs. 4,700
8 reviews
Rs. 3,900
8 reviews
Rs. 5,400
8 reviews

Join Over 1,000,000 Fans

Get exclusive access to discounts and the latest on fitness, nutrition, and wellness delivered straight to your inbox

Free domestic shipping

Free shipping on domestic orders over $99

Free Content & Exclusive Sales

Join our email list and receive member-exclusive promos

Top-notch support

We're committed to an amazing customer experience

Secure payments

Your payment information is encrypted and never compromised