Nandrolone Deca

Deca Durabolin (Nandrolone): A Game-Changer in Bodybuilding

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Deca Durabolin, also known as Nandrolone Decanoate, is a widely used anabolic steroid in the form of an injection, favored by bodybuilders for mass increase during their off-season phase.

First detailed in 1960, Organon launched Deca Durabolin in the market after two years.

It was the second nandrolone ester to be developed by Organon, with the first being Nandrolone Phenylpropionate (NPP).

Originally crafted to help patients combating cachexia, which involves muscle deterioration.

Today, Deca Durabolin remains one of the few anabolic steroids still in medical use, proving beneficial for patients with HIV/AIDS and anemia due to its anabolic nature and capacity to induce erythrocytosis.

By the 1970s, its popularity surged, becoming a staple among top bodybuilders in the so-called golden era—figures like Arnold Schwarzenegger included it in their regimen, often combining it with Dianabol for bulking phases.

Deca Durabolin (Nandrolone) - Ultimate guide.

Deca Durabolin Benefits

Muscular Size and Strength

This steroid fosters muscle growth and strength enhancement, leading to significant body composition changes after consistent use.

It aids lean mass accrual by encouraging protein synthesis and maintaining a favorable nitrogen balance within muscle tissue.

Although it’s not as potent for bulking as other AAS like Anadrol, Dianabol, Superdrol, or Trenbolone, some bodybuilders choose Deca Durabolin for its better safety profile.

Well Tolerated

Approved by the FDA, Deca Durabolin indicates a lesser risk factor. It has shown effectiveness in women for treating breast cancer (1) and in children facing dwarfism issues (2) without significant adverse effects.

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It also enhances collagen production, improving ligament and tendon health, which is particularly beneficial for bodybuilders and powerlifters who lift heavy weights and are consequently more prone to injuries.

Joint Anti-Inflammatory

The steroid supports fluid retention, assisting in joint lubrication.

A study with 18 men suffering from joint discomfort saw 72% report a drop in pain post-treatment with Deca Durabolin, and 28% lessened their painkiller use (3), highlighting the anti-inflammatory capabilities of Deca Durabolin—aligning with anecdotal evidence we have gathered.

No Hepatotoxic Effects

Unlike many oral steroids known for liver toxicity, potentially leading to conditions like peliosis hepatis or cirrhosis, Deca Durabolin, due to its injectable nature, circumvents the liver, showing minimal hepatic impact in our liver function tests.

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Long Esters

Containing long esters, Deca Durabolin has a slow-acting effect, making cycles typically extend to 12 weeks.

This can be seen as a downside for those seeking quick outcomes, yet it can be advantageous for maintaining stable testosterone levels in the blood, which can reduce side effects. Moreover, when combined with other steroids, ongoing results are often observed in later stages of a cycle.

Deca Durabolin Side Effects


Although it mildly alters LDL/HDL cholesterol levels, potentially leading to raised blood pressure, the risk of heart disease remains low when using Deca Durabolin, with cardiac impacts being minimal, as per our lipid tests.

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All anabolic steroids impact blood lipids since they are variants of exogenous testosterone. Nonetheless, Deca Durabolin is comparatively heart-friendly amongst steroids, similar to Testosterone.

Deca Dick

A notorious side effect is the potential for decreased sexual drive and performance, which may lead to erectile dysfunction, known colloquially as “Deca Dick.”

The condition emerges due to a lack of androgenicity in Deca Durabolin, which is needed for nitric oxide production, vital for penile blood flow. The elevation in prolactin levels, a hormone associated with lactation, can also lower sexual interest or arousal.

Combining Deca Durabolin with more androgenic steroids like Testosterone, Anadrol, or Trenbolone, helping maintain nitric oxide levels, has been proven effective in counteracting these issues. Additionally, taking cabergoline with Deca can mitigate symptoms by reducing prolactin levels.

Testosterone Suppression

Utilization of Deca Durabolin carries the likelihood of diminished testosterone production due to its potent nature as an anabolic steroid with high suppressive effects.

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Enhancing natural testosterone production post-Deca Durabolin therapy is often achieved through post-cycle therapy (PCT) protocols including agents such as Tamoxifen (Nolvadex) or Clomiphene (Clomid).

Estrogenic and Progestogenic Effects

Though Deca Durabolin’s estrogenic activity is quite limited, with an aromatization rate only 20% that of testosterone, users may nonetheless encounter side effects typical of estrogen due to the steroid’s propensity to elevate progesterone levels.

Progesterone, akin to estrogen, is a hormone primarily associated with females that can induce breast tissue growth in the mammary glands, occasionally leading to gynecomastia.

It has been observed that the use of anti-estrogens like anastrozole can curtail the expression of progesterone receptors, thereby diminishing the likelihood of developing gynecomastia (4).

Deca Durabolin Usage Cycles

Solo Deca Durabolin Cycle

While Deca Durabolin serves principally for muscle mass enhancement, its moderate efficacy for adding lean muscle often results in its combination with more robust anabolic steroids for significant gains.

Conjoining steroids usually heightens the risk of side effects, such as increased cholesterol and liver enzymes. However, when combined with other steroids, Deca Durabolin may help alleviate certain issues related to sexual function.

Experienced bodybuilders tend to avoid Deca Durabolin-only cycles, aiming to maintain heightened androgen levels and avert the possibility of on-cycle erectile dysfunction.

For those opting for a Deca Durabolin-only regimen, standard dosages are outlined below:

WeekDeca Durabolin

Deca Durabolin and Dianabol Cycle

Dianabol, or Methandrostenolone, is celebrated for its substantial impact on muscle mass growth.

The synergy between Deca Durabolin and Dianabol can result in augmented muscle size and strength, with Deca enhancing Dianabol’s anabolic effects.

Dianabol side effects, generally hypertension and hepatotoxicity, are not significantly worsened when used with Deca Durabolin, as the latter is an injectable with only a slight influence on blood lipids.

This particular cycle is recommended for steroid-veterans who have prior experience with testosterone treatments and have grown accustomed to anabolic steroids.

WeekDeca DurabolinDianabol

This combination has been known to potentially add 30–40 pounds to a user’s physique, alongside a 50–70-pound increase in strength for fundamental exercises.

Some weight gain attributes to water retention, with Dianabol activating the aromatase enzyme, increasing the likelihood of bloating.

The risk of gynecomastia remains due to the interplay of high progesterone from Deca Durabolin and estrogen from Dianabol. The use of an AI (anti-aromatase inhibitor) can counter the testosterone-to-estrogen conversion, although this may negatively impact blood pressure.

This classic bodybuilder pairing harkens back to the golden era, producing significant mass without pronounced androgenic outcomes, allowing users to maintain their hair and avoid male pattern baldness.

Deca Durabolin and Anadrol Cycle

Anadrol, with properties akin to Dianabol, is another oral steroid known for its potent capabilities in muscle and strength augmentation.

Anadrol’s inclusion with Deca Durabolin primarily benefits from the androgenic qualities of Anadrol which can help mitigate Deca Durabolin-related impotence through enhanced nitric oxide production and improved penile blood flow.

WeekDeca DurabolinAnadrol

This cycle is suggested solely for those with extensive steroid experience due to Anadrol’s severe cardiovascular and hepatic implications.

Anadrol can induce hypertension due to its standard 50-100mg daily dosage and affect hepatic lipase, reducing HDL cholesterol considerably.

Concurrent risks of gynecomastia become a concern with this cycle from elevated progesterone via Deca Durabolin and increased estrogen from Anadrol. An AI is ineffective against Anadrol’s direct estrogen receptor stimulation, which does not follow the typical aromatization route.

SERMs such as Clomid or Nolvadex could counteract estrogen activity at the receptor level, deterring Anadrol-related gynecomastia. Nonetheless, these SERMs might amplify progesterone, enhancing concerns of gynecomastia from this stack.

Attempts to deter gynecomastia with an AI aimed at reducing progesterone (rather than estrogen) could intensify cardiovascular strain, leaving Anadrol-induced gynecomastia as an untreated risk.

Following this cycle, the suppression of testosterone is typically profound, necessitating an aggressive approach to PCT.Renowned hormone replacement therapy specialist Dr. Grant Fourie has witnessed considerable triumph in treating anabolic androgenic steroid-induced hypogonadism (ASIH) with a combination of three drugs, markedly speeding the recuperation process. The medications used are:

  • Human chorionic gonadotropin (hCG)
  • Clomiphene (clomid)
  • Tamoxifen (nolvadex)

In a study involving 19 males with suppressed endogenous testosterone production, the administration of this medication trio resulted in all participants achieving normal testosterone levels in their blood serum after just 45 days.

Moreover, this post-cycle therapy (PCT) regimen has proven highly effective in our patients with hypogonadism.

Testosterone and Deca Durabolin Cycle

Outside of competitive seasons, many individuals use Testosterone, a powerful anabolic steroid, to gain significant muscle mass and strength. Meanwhile, its potent androgenic properties allow for its use as a cutting steroid by promoting lipolysis and thus reducing body fat.

Among anabolic steroids, Testosterone stands out for its safety, gaining FDA approval and widespread usage for testosterone replacement therapy (TRT) in myriad males globally.

Combining Testosterone with Deca Durabolin is considered one of the milder steroid pairings in terms of side effects, but it’s an effective combination that can yield over 30 pounds of muscle gain and notable strength augmentation.

WeekDeca DurabolinTestosterone

While this bulking cycle poses minimal risk for hypertension, it can lead to slight increases in blood pressure due to expectable cholesterol alterations.

Both Testosterone and Deca Durabolin are esteemed for their cardiovascular-friendly properties.

Testosterone synergizes well with Deca Durabolin, its androgenic nature helping mitigate Deca Durabolin’s sexual side effects, and it does so while preserving health in other domains, such as the liver, unlike other steroids like Anadrol.

For those concerned about gynecomastia, combining the cycle with an aromatase inhibitor (AI) may prove beneficial by concurrently lowering estrogen and progesterone levels.

Anastrozole and letrozole rank as two favored AI drugs among our clients.

Nevertheless, utilizing this cycle will precipitously lower endogenous testosterone levels, thereby necessitating a PCT. Hair thinning or loss may occur as testosterone can increase dihydrotestosterone (DHT) levels. This cycle is noted to be less favorable for hair retention compared to a Deca Durabolin/Dianabol stack.

Deca Durabolin Outcomes (Before and After Imagery)

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One user displayed remarkable muscle growth and densification following a cycle of Deca Durabolin and Anadrol.

In the pre-cycle image, the individual had a history of selective androgen receptor modulators (SARMs) use, indicating that this wasn’t their initial cycle of performance-enhancing drugs.

The transformation seen is typically expected when Deca Durabolin is stacked with another formidable bulking agent. Observing stretch marks on the individual’s right deltoid in the post-cycle image also hints at the swift anabolic impact from the Deca and Anadrol combination.

Note: Cycles featuring only Deca Durabolin are less likely to deliver such significant mass gains, with outcomes around 20 lbs of muscle being a more common expectation.

Deca Durabolin and Female Users

Some women opt for Deca Durabolin to bulk up and amass lean muscle.

While Anavar is often the steroid of choice for females due to its less virilizing effects, clinical evidence and anecdotal observations suggest that Deca Durabolin can also be safe when it comes to the risk of virilization.

Research points to women generally tolerating Deca Durabolin well with a regimen of 100mg every other week for 12 weeks, effectively amounting to 50 mg/week.

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However, even low dosages, when used over extended periods, have been associated with masculinization. Clinical reports indicate virilization at doses of 50mg every two to three weeks, or 13–25 mg per week. Women considering Deca Durabolin should contemplate shorter cycle durations, ideally no more than 8 weeks.

Female Deca Durabolin Cycle

WeekDeca Durabolin

Note: Anadrol might be a preferred bulking steroid for female use as it does not tend to cause virilization even in high doses over long periods.

Anadrol also has a rapid onset and is quickly cleared from the body, in contrast to the long-lasting Deca Durabolin with a half-life of 6 days. This makes Deca riskier for women who may experience masculinizing symptoms, as the steroid would remain active for up to 12 days even after cessation.


Deca Durabolin vs EQ (Equipoise)

Equipoise, known chemically as Boldenone Undecylenate, is an injectable steroid initially designed for veterinary use, typically prescribed to horses to increase their lean body mass.

EQ is a testosterone analog, modified with an additional double bond between the first and second carbon atoms.Bodybuilders have opted for Equipoise as a substitute for Deca Durabolin, which has a reputation for being a slightly stronger and more androgenic substance.

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It’s our understanding that Equipoise exhibits more estrogenic activity compared to Deca Durabolin, with EQ having half the estrogenic impact of testosterone, but still four times more than that of Deca Durabolin.

Our observations suggest that substituting EQ for Deca Durabolin in various steroid cycles results in outcomes that are quite comparable.

Trenbolone vs. Deca Durabolin

While both Trenbolone and Deca Durabolin are injectable steroids used primarily for bulking, they differ significantly in their chemical behavior and the effects they produce.

Our findings suggest Trenbolone is significantly more anabolic than Deca Durabolin, indicated by an anabolic rating of 500 compared to Deca Durabolin’s 125.

As a result, Trenbolone is more likely to augment lean muscle mass relative to Deca Durabolin. Nonetheless, the actual weight increase at the conclusion of a cycle may be comparable, as Deca can induce fluid retention while Trenbolone is known to promote fat loss.

From our assessments, we recognize Trenbolone as one of the strongest and most severe AAS in terms of harshness, unlike Deca Durabolin, which is milder and approved for medical uses by the FDA.

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Our experience indicates that Trenbolone leads to substantially more cardiac hypertrophy and an increased chance of atherosclerotic plaque formation.

Moreover, Trenbolone has a high androgenic nature, contrasting with the less androgenic profile of Deca Durabolin. Consequently, issues such as a receding hairline, acne vulgaris, and an enlarged prostate are frequent with Trenbolone usage but are less common with Deca Durabolin.

Therefore, Trenbolone can profoundly alter body composition, but it also carries a higher risk of severe side effects like hypertension.

Summary: Deca Durabolin Pros and Cons


  • Lower risk of side effects
  • An effective agent for muscle mass increase
  • Relatively safe for short-term usage in women
  • Beneficial for joint health


  • May lead to sexual dysfunction
  • Requires injections, which may be a drawback for some
  • Can suppress natural testosterone production.













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Dr. Grant Fourie, a specialist in male hormones, is based in Cape Town, South Africa. He provides comprehensive treatments for conditions related to low testosterone, such as erectile dysfunction, fatigue, and mood changes. His methods include hormone replacement therapy and other modern treatment options.
Contact me via email or phone to book personal appointment in my clinic: The Village Square, Cape Town - South Africa


About Dr. Grant Fourie

Dr. Grant Fourie, a specialist in male hormones, is based in Cape Town, South Africa. He provides comprehensive treatments for conditions related to low testosterone, such as erectile dysfunction, fatigue, and mood changes. His methods include hormone replacement therapy and other modern treatment options. Contact me via email or phone to book personal appointment in my clinic: The Village Square, Cape Town - South Africa

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