Trenbolone [Tren]: What Does The Steroid Trenbolone Do

Steroids are ubiquitous amongst bodybuilders and competitive athletes. Although banned by the World-Anti-Doping Agency (WADA), for use in sports, athletes still use anabolic steroids, to enhance performance and strength. One of the most popular anabolic steroids, trenbolone, otherwise known as Tren, is an anabolic steroid, estimated to be three-five times more potent than testosterone, due to its high tissue-selectivity and affinity for muscle. We are going to discover what tren does, how trenbolone works, as well as the benefits and side effects.

What Is [Tren] Trenbolone 

Tren or trenbolone is an anabolic and androgenic steroid (AAS). Specifically, tren is classified as a steroidal selective androgen receptor modulator (SARM).

Structurally, SARMs can be categorized into steroidal and nonsteroidal SARMs. Steroidal SARMs are formed and synthesized by modifying the molecular structure of testosterone.

All AASs are derivatives and molecular modifications of the endogenous hormone testosterone. Tren 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.

Tren was first marketed and sold under the brand names Finajet and Finaplix, by the pharmaceutical company Merck. Trenbolone acetate was first synthesized in 1963 and introduced for veterinary use in the early 70’s to promote muscle growth in cattle.

How Does [Tren] Trenbolone Work

Trenbolone, a synthetic analog of testosterone, is classified as a SARM. SARMS have a high affinity for selectively binding to androgen receptors, and high tissue-selectivity for muscle and bone promoting greater anabolic effects. SARMS have less androgenic effect and virilization than testosterone.

Virilization, is the development of male physical characteristics (such as muscle bulk, body hair, and deep voice) in a female or precociously in a boy, typically as a result of excess androgen production.

Trenbolone like other SARMS does not undergo aromatization to estrogen or 5-alpha reduction which may contribute to the prostate-sparing effects [R].

Certain androgens like testosterone undergo aromatization (conversion of testosterone to estradiol) However, in vitro evidence indicates that trenbolone and its primary metabolites are relatively non-estrogenic, and in vivo evidence demonstrates that trenbolone induces antiestrogenic effects.

Mechanistically, tren is very similar to other anabolic and androgenic steroids. Trenbolone has the capacity to produce insulin like growth factors, (IGF-1), as well as upregulates fibroblast growth factor.

However, what differentiates tren from other anabolic steroids, is that tren also expresses anticatabolic mechanisms associated with reductions in endogenous glucocorticoid activity [R].

Therefore, tren inhibits muscle protein breakdown, which increases overall protein synthesis and anabolism. 

Trenbolone [tren] Benefits

Muscle Building 

Trenbolone like other anabolic steroids, facilitates anabolic effects, via increases in protein synthesis, and nitrogen retention. Due to high tissue-selectivity for muscle tissue, tren is commonly used as a performance enhancing aid, for bodybuilders and athletes. Yet, tren is not as anabolic when compared to other steroidal and non-steroidal androgen modulators.

Fat Loss

Preliminary and pre-clinical trials have shown that tren induces fat loss, greater than other steroids such as testosterone enanthate. This could be due to the prevention of catabolic responses, while inducing more potent lipolytic effects within visceral visceral adiposity than endogenous androgens, at least on a dose-to-dose equivalent. 

Trenbolone Side Effects 

Since tren has never been synthesized for therapeutic use by humans and no studies investigating the effects of trenbolone have ever been performed with human clinical trials, there is no evidence to support the safety and efficacy of its uses.

However, Trenbolone hexahydrobenzylcarbonate, or trenbolone cyclohexylmethylcarbonate, sold under the brand names Parabolan and Hexabolan, is a synthetic, injected anabolic–androgenic steroid (AAS) of the nandrolone group and an androgen ester. This was introduced by Negma Pharmaceuticals in France. This pharmaceutical drug was pulled from market in 1997.

Trenbolone is recognized as one of the riskier anabolic steroids, due to the fact that it lacks in therapeutic evidence and application.

AAS can cause significant alterations in the density of serotoninergic receptors in animals, leading to an established anabolic steroid-serotonin connection, which is believed to be the underpinning of why there is a change in emotional state and behavior with steroid use [R].

Trenbolone has been identified as one of the most neurotoxic anabolic steroids, attributable to modulated serotonin receptor activity and associated with decreased serotonin neurotransmission [R,R].

Individual cases of violence, death, and cardiovascular risk has also documented with trenbolone use [R].

Short term side effects of trenbolone which have been identified, include:

  • Insomnia
  • High blood pressure
  • Increased aggression
  • Libido

Estrogenic side effects, from the lack of aromatization, and affinity for the estrogenic specifically progesterone receptor, can cause lactation.

Since tren is 300% stronger than testosterone, it also comes with androgenic effects. These side effects, can lead to

  • Loss of hair
  • Acne
  • Change in Prostate Size
  • Effects in libido
  • Hypogonadism

Long term side effects include

  • Cardiovascular effects
  • Increases in LDL and decreases HDL
  • Kidney damage
  • Liver damage
  • Neurodegenerative effect [R].

Studies have shown that low doses of tren does not induce prostate enlargement, whereas large doses of trenbolone can increase prostate mass to a similar magnitude, compared to testosterone.

Testosterone is converted to DHT or dihydrotestosterone, which can amplify virilization or androgenic effects.  Although tren is 300% more potent than testosterone, is does shown an equal 1:1 potency to DHT at large doses.

Trenbolone: Takeaway

Trenbolone or tren is often used recreationally by bodybuilders, in the cutting phase of bodybuilding prep. This is due to the powerful anabolic effects, combined with the anti-catabolic effects and prevention of visceral fat accumulation. However, due to the lack of evidence and litany of potential side effects, the risks far outweighs the benefit in trenbolone use. Safety, efficacy, and therapeutic dosage, cannot then be determined to the absence of well established and proven evidence. 

Disclaimer: Swolverine does not condone or sell steroid or non steroidal anabolics. The contents of this article are for informational purposes only. Trenbolone acetate and other forms of trenbolone are schedule III controlled substances in the United States. Possessing, using, or distributing these substances may lead to serious legal consequences. Trenbolone is on the WADA prohibited banned substance list and will cause a failed drug test.


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