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Trenbolone acetate :

Trade name StrengthContainerManufacturer
Finaject [NLM] 30 mg/ml Roussel France
Finajet [NLM] 30 mg/ml50 ml vialHoechst UK, U.S.
Finaplix20 mg/pellet70, 100 pellet cartridgeHoechst-Roussel U.S.
Finaplix [NLM]20 mg/pellet70, 100 pellet cartridgeRoussel MX
Revalor (plus estradiol)22 mg/pellet70, 100 pellet cartridgeHoechst-Roussel U.S.
Synovex plus (plus estradiol)28.5 mg/pellet80 pellet cardtridgeSyntex U.S.
Trenbol 75 75 mg/ml20 ml vialTtokkyo MX

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 30mg/ml of this fast acting acetate ester of trenbolone, and came packaged in a whopping 50mí 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, eaming 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 noteworthy 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 humans9°. 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 bindings'. 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®/Nolvadexc) 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 92 93. 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 trenbolone, 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 trenbolone 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, trenbolone 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® (discussed below) 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.


Finaplix® is a veterinary cattle implant which contains trenbolone acetate. This was the first commercial product to contain trenbolone acetate after its long hiatus following the withdrawal of Finajet and Finaject in the late 80's, and similarly has warranted a lot of attention with athletes since its release to spite being in the form of an implant pellet. With its success some competing trenbolone acetate pellets have subsequently been introduced to the U.S. market as well. What is so unusual about all of these products is the fact that remarkably they are all exempt from U.S. controlled substance laws. They are totally and perfectly legal to buy with no license or prescription, albeit for the use of implanting cattle and not self-consumption. I assume this is to make it easy for livestock owners to have access to growth promoting agents. If a veterinarian were needed every time these products were to be used they might be too troublesome or cost prohibitive to consider. Admittedly since these products come in the form of pellets they are not in a form suitable for human consumption either, making their exemption seem a little more reasonable than at first glance. Currently the most popular such product is still the original Finaplix, sold by the now merged Hoechst-Roussel Agri-vet Company. This product comes in two forms, Finaplix-H and Finaplix-S, which denotes if the product was intended for a Heifer or a Steer respectively. The total dosages of both products are different, with the "H" version containing 100 20mg TA pellets (2,000 mg) and the "S" version only 70 (1,400 mg). Ivy Animal Health has introduced two competing products of equivalent makeup, sold as Component-TH and Component-TS. There are also the Revalor and Synovex+ brands that contain trenbolone acetate with an added dose of estrogen, however these are much too troublesome for the athlete to consider using and should never be purchased.

Since in this case the drug comes in the form of a cattle implant administration is a bit difficult. Most commonly one or two implant pellets are ground up and mixed with a 50/50 water/DMSO mix and applied to the skin daily. This home-brew transdermal mix is effective, but the user is forced to walk around bearing the ripe scent of garlic (an effect of the DMSO). Others simply grind up one or two pellets with the back of a spoon and inhale (snort) them. Here the drug enters the blood stream through the mucous membrane, a poor but still effective means of delivery for steroid hormones. Those who have tried this often claim it is not as irritating as they had imagined it would be beforehand. One however does always run the risk of wearing away at the lining of your nose after time, so it would be best not to make this a regular habit. More adventurous individuals make a practice of mixing their own injections. The pellets are ground into a fine powder (usually anywhere from 2 to 6 pellets), and then they are added to sterile water, propylene glycol or an oil-based injectable steroid (or veterinary vitamin). This is usually repeated twice weekly, although some do manage to undergo this practice more frequently. Since this is not being
done in a controlled. sterile environment, one is obviously taking a risk. I do not doubt that infection is a common result. Some have actually started selling kits that contain all the necessary ingredients to brew a pure and sterile injectable right in your kitchen. All 1 can say is that the two kits I have looked at seemed very thorough, and feedback is typically excellent. It is also of note that trenbolone acetate implant pellets are the active ingredients in a number of black market preparations, including the popular Finabolan. Make no mistake; this is an underground product, to spite the fact that it now carries a very official looking hologram sticker.

Finaplix® and competing trenbolone acetate pellets are available through many veterinary suppliers. This is the least expensive way to locate this steroid, as an agricultural store will typically sell a single Finaplix-H cartridge (2,000mg) for approximately $35. On the black market this same amount can easily sell for as much as $75 or $100. The only commercial injectable (Trenbol 75) is even less cost effective though, as it offers 1,500mg of steroid for as much as $180-200. For most of course the purchase of a prepared injectable is well worth the price, while many still find the great prices on cattle pellets impossible to ignore. Since many vet/agricultural suppliers have become aware that athletes are ordering these products, you should know that many are reluctant to sell. It is also rumored that the FDA gets a report of all of the sales of this product, however to date I have not heard of anyone having trouble with the law for simply buying the product.


No counterfeits of the Trenbol injectable are known to exist. As with the full Ttokkyo line, Trenbol is protected by a security hologram sticker to deter duplication. Make sure to look for it when shopping. The Finaplix® and Component@ cattle implants are also safe buys, as no fakes are known to exist of these products nor are any expected. These are the only legitimate products containing trenbolone acetate anywhere at this time, so avoid all others.


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