Does Testosterone Isocaproate/Caproate Work in Bodybuilding?

Testosterone is the male sex hormone. This substance is responsible for many of the differences between men and women and specifically, helps men to be more muscular, more toned and more libidinous than women.

Two out of these three things are highly desirable for bodybuilders, while the latter is desirable for all men. This is why testosterone is so highly sought after among men and it’s why guys are willing to go to great lengths to get more of it.

It’s also why doctors will prescribe various testosterone treatments for men that have clinically low levels. The question then is: can bodybuilders and athletes use medications designed for improving natural testosterone levels in order to build more muscle? Let’s take a look at two popular forms of testosterone.

What Are Testosterone Isocaproate and Caproate?

Testosterone isocaproate is a type of synthetic testosterone that is attached to an isocaproate ester. This determines how the testosterone is delivered and how it travels through the body. As you may already have guessed then, testosterone caproate is attached to a caproate ester.

What’s the difference? Very little. The two terms are regularly used synonymously and their chemical makeup is close to identical. The matter is much more about availability and which type of testosterone a user is able to get hold of/afford.

And actually, both isocaproate and caproate are much rarer than other forms of testosterone with esters such as decanoate or propionate. Isocaproate is particularly rare even among these two. Both though are perhaps best known for their inclusion in blends Omadron and Sustanon. They are also particularly effective for testosterone replacement therapy, as the form has a slightly longer half-life compared with many other types of testosterone meaning that it doesn’t require as regular injections.

Do They Work for Bodybuilding?

So, the big question: do these forms of testosterone work for building muscle?

The answer is yes… and no. For those that are a little more familiar with steroids and testosterone injections, suffice to say that this form of testosterone comes with all the usual pros and cons. That is to say that it will help you to build more muscle yes, but it will also come with a number of side effects.

Those side effects include:

  • Acne
  • Irritability/mood swings
  • Impotence
  • Hair loss
  • Reduced natural testosterone production
  • Gynecomastia
  • And others

Raising testosterone causes a number of different side effects when it goes beyond normal levels – just think back to puberty for proof!

Worse though, is that when testosterone is elevated in unnatural ways, the body responds by shutting down natural endogenous production. This means you can end up permanently requiring TRT just to maintain regular levels.

And that is why it is always much safer to use products like Testosteroxn from Crazy Mass.


Crazy Mass is a US based company that is known for its high-quality bodybuilding supplements that mimic steroids without any harmful side effects. It’s range of 100% legal steroids is a massive hit among bodybuilders and can help you bulk up or cut muscle without side effects.

Some other well-known brands that include Marine Muscle, Crazy Bulk, and

Check out the best testosterone boosters from each of these companies in the table below:

Testosteroxn by Crazy Mass
Testo Max
Trooper by Marine Muscle
Testosterone Plus from
Increases male hormone or Testosterone safely and naturally, Has both anabolic and androgenic qualities, Increases Muscle Mass and Strength, Enhances Fat Burning, Increases Libido and Gives a Boost in the Bedroom Increases natural testosterone production, boosts muscle growth, increases strength, speeds up recovery, enhances libido, great for bulking and cutting cycles Increases Free Testosterone, Creates Anabolic Environment in the body, Boosts Strength, Increases Lean Muscle, Helps Speed Up Recovery, Helps Get Over Plateaus, Boost Fat Burning in the Body, Enhances Libido or Sex Drive, Shows Results in less than 2 Weeks Enhances testosterone and HGH, Developed with input from IFBB pros, Increases lean muscle, Boosts fat burning, Speeds up recovery, Increases energy, Enhances stamina, Boosts libido
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