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What Is Boldenone And How Does It Affect The Body?

Michael Garrico
Published by Michael Garrico
Fact checked by Donald Christman, BHSc FACT CHECKED
Last updated: October 4, 2022
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As a personal fitness coach, I spend most of my days at the gym working with clients and on my own workout routines.

And over the years, I’ve gained enough experience to be able to quickly spot those guys at the gym who are building up lean muscle mass way too quickly for their training routines.

Unfortunately, these guys more often than not resort to taking anabolic steroids like Boldenone undecylenate. While it can improve protein synthesis and muscle building, there are also some significant health issues associated with the regular use of Boldenone.

To help people better understand these issues, I did thorough research and consulted with some medical professionals to give you a clear perspective.

Quick Summary

  • Boldenone undecylenate is a synthetic derivative of testosterone that is predominantly used in veterinary clinics for horses.
  • It functions like many other anabolic androgenic steroids and can significantly boost muscle development in men.
  • There are several significant side effects associated with this growth promoter drug, especially when people resort to higher doses.

What Does Boldenone Do?

Holding a small syringe

Boldenone is an anabolic androgenic steroid that is used as a synthetic testosterone replacement.

However, it is only approved as a veterinary drug and not for use in humans as a treatment for low testosterone [1].

While it’s not uncommon for veterinary use drugs to eventually be modified for human use, there is currently no human version of Boldenone available.

It’s mainly used in horses as a testosterone replacement drug.

And because it triggers a significant performance enhancement, it’s also banned in horseracing.

There are also very strict laws around the use of this drug in other animals. Farmers are not allowed to use it as a growth promoter as even trace amounts can make it through to products aimed at human consumption [2].

“Boldenone is an androgenic steroid that improves the growth and food conversion in food-producing animals. In most countries worldwide, this anabolic steroid is forbidden for meat production.”

- Bruno Le Bizec, Co-author of Criteria to Distinguish Between Natural Situations & Illegal Use of Boldenone Study

The main use for Boldenone is to treat debilitated horses to help them gain muscle strength and weight [3].

Is Boldenone A Banned Substance In Sports?

Yes, Boldenone undecylenate is banned in sports, and it will show up in blood tests that check for urinary excreted metabolites. It’s also banned for use in racehorses as there is a significant strength and performance boost associated with it.

However, that hasn’t stopped several professional athletes from resorting to this drug along with other steroids to achieve faster muscle bulking results. According to USADA data, 87 athletes tested positive for Boldenone in 2018 [4].

It’s easily detectable in common drug tests and can cause long-lasting suspensions.

What Are The Side Effects Of Boldenone?

Naked man having a heart ache

Here are the more severe side effects of the anabolic steroid Boldenone.

  • Increased Estrogen - It might sound strange that anabolic androgenic steroids cause estrogenic side effects, but the body transforms increased T-levels into estrogen. This can cause water retention and gynecomastia [5].
  • Androgenic Effects - Even though Boldenone has low androgenic potency, users have to expect problems like acne, oily skin, hair growth, and increased red blood cell production [6].
  • Cardiovascular Effects - One of the more serious problems with Boldenone is higher blood pressure, which can place a lot more strain on the heart and lead to dangerous cardiac issues [7].
  • Cancer-Causing - There are also reports that it’s a probable human carcinogen; however, the International Agency for Research on Cancer hasn’t conclusively listed it as a cancer-causing drug. That could be related to the fact that it’s not licensed for human use in the first place.

Boldenone Availability

Injecting a syringe

Like other anabolic steroids, Boldenone is only available as a medical drug.

And since it is only approved for use in animals, it can’t be prescribed by doctors for human steroid use.

Athletes and bodybuilders who have been using it for performance enhancement typically get it on the black market for medical drugs.

I always warn clients and readers against taking such actions because of the obvious reasons, not the least of which is the above-mentioned list of risky side effects.

Also, it’s possible to achieve a testosterone boost through natural supplements that contain completely legal substances. They’re not magic pills and won’t boost your T-levels overnight.

But with the right training and diet, it’s possible to achieve significantly higher serum testosterone within two months.

Related Steroid Articles:


Does Boldenone Increase Vascularity?

Yes, Boldenone may increase vascularity. This is a common side effect of most anabolic drugs, and it’s an obvious sign of steroid usage when bodybuilders have bulging veins even when muscles are relaxed.

What Is Another Name for Boldenone?

Equipoise and Parenabol are other names for Boldenone. These are licensed names for use in veterinary medicine and are not supposed to be used for human injection.

Always Be Aware Of Steroid Dangers

Every performance-enhancing drug comes with a long list of dangerous side effects that doctors have to monitor. But with Boldenone, the additional risk is that this synthetic testosterone is not even designed for use by humans.

A much safer approach to gaining a natural T-level boost is with natural supplements.

The line of products that I’ve seen the best long-term results with is the CrazyBulk Stack. It combines a few different supplements with natural vitamins, minerals, and herbs to trigger a completely natural response in the body.

As a result, athletes can gradually and legally boost their T-levels and avoid all those nasty side effects.


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Crazy Bulking Stack

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