Trenbolone Acetate

Trenbolone Acetate

ALTERNATIVE STEROID NAMES: Trenbolone Acetate, Trenabol 75, Trenabol, Trenabolic, Finaplix, Finajet.
ACTIVE SUBSTANCE: Trenbolone Acetate
Strength Gains: Strength gains 10/10
Mass & Weight Gains: Mass & Weight gains 10/10
Fat Burning: Fat burning 0/10
Cutting/Definition: Definition gains 7/10
Side Effects: Side effects 9/10
Ability to keep Gains: Ability to keep gains 4/10
Usual dosages: 50 – 100 mg per day
Detection time: 4 – 5 months
Best combined with:
Bulking: Deca-Durabolin, Equipoise, testosterone, Anadrol, Dianabol.
Cutting: Winstrol, Primobolan,
Beginner Use: Use for beginners 3/10
Female Use: Female use 1/10
Pros: Good mass/strength gains, good definition and fat loss.
Cons: Fast testosterone production suppression, Side effects.


Trenbolone Acetate is a fast-acting injectable steroid with a great effect on protein metabolism. Dosage for Trenbolone acetate is 50 – 100 mg per day.

Trenabol is a steroid having the advantages of undergoing no adverse metabolism, not being affected by aromatase or 5alpha-reductase, of being very potent Class I steroid binding well to the androgen receptor, and having a short half life, probably no more than a day or two though this has not been measured. Fifty milligrams per day is a good dosing for someone on his first cycle or someone who is as yet less than, say, 20 pounds over his natural limit, while 100 mg/day may be preferred by the more advanced user who has already gained more than this. These doses are assuming that trenbolone is the only Class I steroid being use. There really is no need to stack another — testosterone being the only sensible exception — but if another is stacked then the amount of trenbolone may be reduced accordingly. There is no evidence in the literature, nor I think practical evidence, that trenbolone acetate has a special role in burning fat. Rather, it is an extraordinarily potent AAS, being about three times as effective per milligram as testosterone esters. This seems to apply only to Class I activity, however. To obtain good anabolism from non-AR-mediated mechanisms, a Class II steroid such as Dianabol or Anadrol should be stacked.


Trenbolone is a strong androgen that is devoid of estrogenic activity. The first preparation containing this steroid to catch the attention of the American bodybuilding community was Finajet, a veterinary preparation introduced in the 1980’s in U.S. and Europe (as Finaject) by the drug firms Hoechst and Roussel. This product contained 30 mg/ml of this fast acting acetate ester of trenbolone, and came packaged in a whopping 50 ml vial. Finajet made a strong showing for a short period in the 80’s, where this androgen became a sought after cutting steroid. The strong androgenic and non-estrogenic properties of this steroid made it ideal for increasing muscle hardness, definition and strength without water retention, and consequently Finajet became popular with competitive bodybuilders. Hoechst removed the product from the market by 1988 however, the European version soon followed, and the U.S. source for trenbolone quickly dried up. It had disappeared from the market for quite some time, earning cult status as some type of unobtainable super-steroid. After some time however trenbolone acetate had reemerged in the U.S., first in the form of Finaplix cattle implant pellets and more recently as the injectable Trenbol 75 introduced in and imported from Mexico. Its old reputation stuck, and these products are now in very high demand on the U.S. market.

Structurally trenbolone is a 19-nor steroid, being derived from the anabolic nandrolone. Its additional two alterations however (c9 and c11 double bonds) make trenbolone very different in appearance than its parent nandrolone. First, as mentioned estrogenic activity has been eliminated. This is a result of the c 9-10 double bond, which occupies a bond that would be necessary for aromatization of the A ring to be possible. This bond does not appear to be removed metabolically, which is the only way estrogen conversion would be possible with this compound. Although nandrolone is rarely thought of as an estrogenic steroid, conversion to estradiol is still possible to a low extent. The fact that trenbolone does not convert to estradiol therefore remains to be a significant difference between the two steroids.

Its lack of estrogenic activity has made trenbolone very appealing for competitive athletes looking to shed fat, while at the same time trying to avoid water retention. Likewise “tren” can give us the high androgen content needed in order to elicit a very hard, defined physique. While it is a exceptional hardening agent, this is certainly not the only benefit to this steroid however, it also a noteworthy anabolic. The muscle building properties of this steroid are often compared to strong drugs such as testosterone and Dianabol, said to be very similar just without the same level of water retention. This may be a little generous of a description however. Its lack of estrogenic activity does seem to hurt this agent in its abilities to promote muscle mass gains. For many, it is similarly still relegated to cutting cycles. Of interest is the fact that while tren is often recommended as a great addition to a good mass cycle, it is rarely reported to be such a powerful agent when used alone. When taken without another estrogenic steroid, results are most often reported as good lean tissue growth accompanied by exceptional hardening and fat loss. Although perhaps it is not quite as potent as the more estrogenic bulking agents if sheer mass is the goal, I think we can still safely say that trenbolone is a better builder milligram for milligram than nandrolone, and likely the most anabolic of all the non-estrogenic steroids.

The androgenic activity of this drug is also much stronger than that of its parent nandrolone. This is due to two interesting traits. First, trenbolone does not appear to undergo 5-alpha reduction in humans. As such, it does not display the strong anabolic/androgenic dissociation noted with nandrolone. It retains the same level of potency when entering cells of various androgen target tissues as it does when entering muscle tissues, and does not get weaker. This in of itself makes trenbolone far more androgenic in appearance. Furthermore the induction of double bonds at c9 and c11 seems to increase androgen receptor binding. This represents a second way that the potency of trenbolone is increased. Side effects like acne, body/facial hair growth and hair loss are therefore all possible during use of this steroid. To spite the base structural similarities of the two steroids, we should clearly not confuse trenbolone in any way with nandrolone in regards to its ability to induce such side effects. Tren is simply much more androgenic.

Trenbolone will also suppress natural testosterone production very quickly, making clear that estrogen is not the only culprit in this regard. This would necessitate the use of a testosterone stimulating drug like Clomid/Nolvadex and/or HCG in order to avoid a pronounced “crash” as the drug is discontinued. This may have something to do with its progestational activity. Although listed as non-progestational in other steroid literature, studies clearly show trenbolone to bind with this receptor. Since we know that all sex steroids promote negative feedback inhibition of testosterone production, including progestins, this mechanism cannot be excluded. We also know that the effects of estrogen seem to be augmented by heightened progestin levels, with this hormone capable of inducing side effects that might not otherwise be apparent with a given level of estrogen in the body. While we do notice however that estrogenic side effects do not seem to be reported with trenboione, it may still be reasonable to conclude that some caution should be taken with this compound (particularly when using this steroid with other estrogenic steroids). Logical leads one to think that without heightened estrogen levels the slight progestational nature of trenboione may fail to induce side effects, while it would have the potential of lowering ones threshold to side effects when other estrogenic steroids are used concurrently by enhancing the actions of this hormone. This theory of course cannot be proven at this time.

Trenbolone is very versatile steroid, working exceptionally well for both bulking and cutting purposes. It seems to mix well with just about any type of steroid. For a lean, hard build one can add a mild anabolic like Winstrol or Primobolan. Without extra water beneath your skin, the androgen/anabolic mix will elicit a very solid, well-defined build. For a good mass gain, still without excessive bloat, Deca-Durabolin or Equipoise are popular additions. Here again, the tren will greatly enhance and solidify the new muscle growth. When looking purely for mass, trenboione pairs well with testosterone, Anadrol 50 or Dianabol. The result will no doubt be an incredible gain of (somewhat solid) muscle mass. In some rural areas where anabolics are hard to obtain, Finaplix is commonly used in conjunction with Synovex pellets (testosterone propionate/estradiol benzoate). Although the slight estrogen content of Synovex does give us some unwanted bloat, the testosterone propionate adds in very well. A very cheap, easy to obtain combination which is still technically legal since cattle implants are excluded from U.S. controlled substance laws.

Leave a Reply

Your email address will not be published. Required fields are marked *