Dynabolon (Nandrolone Undecanoate) Results & Bodybuilding Review

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Nandrolone undecanoate (Dynabolon) is a synthetic anabolic androgenic steroid.

When used in medical scenarios, it has been used to treat hypogonadism.

Without a prescription, it’s found on the black market and available to bodybuilders and athletes around the world.

Underground labs (ULs) commonly develop their own products and give them names that are similar to their prescription strength “relatives”.

What is Dynabolon?

Dynabolon is a synthetic and underground substance

It was developed to mimic similar effects to nandrolone decanoate, otherwise known as Deca durabolin or simply Deca.

Dynabolon is no longer manufactured, at least from legitimate and government approved or regulated pharmaceutical companies.

It was developed in the 1960s and was also known as Psychobolan at the time.

Not long after, most forms of UL nandrolone undecanoate as well as Dynabolon were phased out due to the difficulty in procuring it as well as competition from other anabolic androgenic steroids that were not only easier to obtain, but provided similar benefits.

Esters have the potential of slowing down absorption rate and affecting the half-life or active life of a-based drug in regard to longevity and length of activity in the body.

The Nandrolone undecanoate active life is 16 or more days.

The undecanoate ester is one of the slower esters often attached to various forms of steroids, which in medical scenarios is beneficial because it cuts down on the need for frequent injections.

Nandrolone Undecanoate (Dynabolon) For Bodybuilding

In addition to the longer acting benefits of the undecanoate ester, nandrolone is considered a 19-nor or 19-nortestosterone hormone, a modification of endogenous or body-produced testosterone through the modification in its structure at the 19th carbon atom.

Bodybuilders rate anabolic androgenic steroids based on their anabolic/androgenic potential. Testosterone is rated 100/100. Some synthetic and designer steroids today range higher or lower.

A list of example potentials:

Trenbolone – 500/500

Oxymetholone (Anadrol) 320/45

Nandrolone decanoate (Deca durabolin) – 125/37

Nandrolone undecanoate – 125/37

Nandrolone phenylpropionate – 125/37

Boldenone undecylenate (Equipoise)- 100/50

Testosterone, regardless of ester, is rated as 100/100.

The only difference among them is the ester potential for producing faster, more potent results with less longevity, or an ester that produces a longer release of the base drug, although not as potent.

Dynabolon Benefits

Dynabolon was a popular steroid generally used by bodybuilders to maintain muscle mass gains off-season.

It was also used by athletes who weren’t looking for tremendous bulking capabilities but wanted greater stamina, strength, and endurance.

Because of its low rating as an androgenic steroid, it didn’t tend to cause as many of the estrogen-like side effects associated with other steroids.

The higher the anabolic rating of any steroid, the higher the risk of aromatization or conversion from testosterone into estrogen.

This process triggered female-type side effects in male users that includes but is not limited to:

Gynecomastia (development of male breast tissue)

Water retention


Even though it was not rated high in estrogenic potential, it did produce some pro-gestational activity. Progestins can act much like estrogens in the body.

Dynabolon was not typically used by itself, as it’s potential was rather limited in its anabolic features.

It was often combined with other steroids and always accompanied an appropriate nutrient rich diet as well as exercise regimen.


Dynabolon (nandrolone undecanoate) was believed to improve:

Development of collagen, a connective tissue that is found in ligaments, tendons, cartilage, and plays a role in bone strength or density.

Mineral retention.

Production of insulin-like growth factor-1, manufactured in the liver, and together with testosterone and growth hormone, plays a role in larger muscle development.

Red blood cell synthesis, which is beneficial for the health and nutrition needs of muscle cells and fibers due to the transportation of oxygen as well as nutrients to the cells.

Synthesis of proteins. Protein provides the foundation for development of muscle tissue.

Retention of nitrogen in the muscles. Muscles require specific balances of oxygen and nitrogen for health and wellness and to prevent muscle degeneration.

Dynabolon Side Effects

Any anabolic androgenic steroid, including nandrolone undecanoate (Dynabolon) had (and has) the potential to cause side effects and adverse reactions.

One of the more common side effects associated with Dynabolon, and other steroids, is increased blood pressure.

Long-term high blood pressure (hypertension) can cause damage to cardiovascular function.

Another of the common side effects of steroid use is testosterone suppression. When exogenous forms of testosterone are injected or absorbed in the body, the body will stop manufacturing its own so that levels don’t become too high.

If the testes are not manufacturing testosterone, they can shrink, a term known as testicular atrophy. This can also affect fertility.

While nandrolone undecanoate (Dynabolon) is no longer manufactured for the most part, a few forms of nandrolone undecanoate can still be found on the black market.

If it is found, be aware that dosage recommendations will be questionable and uncertain due to the inability to verify quality or milligram strength.

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