By: Juice

Last updated: is intended for informational purposes only and does not take the place of professional medical advice.

Guys will often argue about which is “the most powerful steroid” in existence. The word powerful gets thrown around a lot in the steroid world, but very would be game to argue against Trenbolone being at the very top of the most powerful steroid rankings. You will also hear a lot about this or that steroid not being recommended for beginners.


This is often a matter of opinion or personal preference, but when it comes to Trenbolone we really do mean that this is a steroid that beginners don’t want to be touching. But what exactly does “powerful” mean when it comes to a steroid like Trenbolone?

I was fascinated by Tren when I first came across it, and discovered there’s a lot to know about before you can get really comfortable in having it be a compound you would want to use on a regular basis.

Author’s Note: The following guide is based on my personal experience and does NOT promote the illegal use of steroids (PEDs).

Trenbolone History and Overview

Trenbolone is recognized as the strongest anabolic steroid available. It’s a steroid that is not one to be used by beginners and is usually only used by advanced steroid users, or at least those who have several other steroid cycles under their belt already. Trenbolone is a Nandrolone derived steroid, which itself is better known by the name of Deca-Durabolin. This means that Tren is a modified form of Deca – only even more powerful.

Trenbolone Effects
Trenbolone Effects

Trenbolone has been around since the 1960’s, but it’s only use today is in livestock where it’s used to encourage greater growth in cattle. Cattle are implanted in the ear with 200mg of Tren (under the brand name Finaplex) which gradually releases into the animal.

This tells us precisely what Trenbolone’s main strength and appeal is to bodybuilders: to promote fast muscle growth. While in the distant past it was for a short time approved for human use, and today is still investigated for any potential safe medical applications in humans, it remains unapproved for any use by people.

Tren has an almost unbelievable androgenic and anabolic rating when we compare it to other steroids, particularly testosterone. While unaltered testosterone has a anabolic and androgenic strength of 100 for both, Trenbolone multiplies these numbers by 5.

So we get a 500 anabolic and 500 androgenic rating with Tren. This translates to substantial anabolic properties that leads to huge muscle growth, while binding much more strongly to androgen receptors compared to testosterone.

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Chemical Characteristics and Properties

The potency of a steroid is about a lot more than a number, but you just can’t look past the fact that Trenbolone’s massive anabolic rating dwarfs other steroids.

If you’re not familiar with these ratings, it’s enough to know that Testosterone is the standard hormone that we can compare other steroids to and it’s anabolic to androgenic ratio is 100:100.

Then we get to Trenbolone. It has an anabolic/androgenic ratio of 500:500. Trenbolone’s anabolic potency can be thought of as five times more powerful than regular testosterone, and it’s androgenic activity is also five times more powerful.

These big numbers naturally come with both positive and negative impacts for you when using Tren and this is ultimately what makes it such a challenging steroid for anyone to use.

With the modifications made to Trenbolone’s chemical structure that make it a 19-nor compound, we get a steroid that is completely immune to any aromatization as it is essentially blocked from associating with the aromatase enzyme.

The lack of aromatizing activity can easily lead us to get excited about the lack of estrogenic effects, so therefore no gyno or water retention. Unfortunately it is no so straightforward, due to Tren’s progestin activity.

This activity in turn stimulates mammary tissue estrogen so the more specific estrogen caused side effect we can in fact still suffer with is gyno. Anti-estrogen drugs can reduce or eliminate the risk, and not all men will suffer this side effect.

There are three esters of Trenbolone: Trenbolone Acetate, Trenbolone Enanthate, and the lesser known Trenbolone Hexahydrobenzylcarbonate. Out of these, Tren Acetate is by far the most commonly used by bodybuilders. Trenbolone is purely an injectable steroid. There is no oral form available.

Due to Tren’s immense power, we don’t need to use large doses to get substantial benefits. To receive similar benefits from Testosterone, you would have to use (predictably) five times the dosage of Trenbolone, which is an unrealistic scenario. It’s little wonder then that when guys are ready for more extreme muscle gains, they turn to Tren instead of adding more and more testosterone to a cycle.

Trenbolone Acetate

Tren Acetate is one of three estered forms of Trenbolone. An ester simply controls the rate of release of Tren after you’ve injected the hormone. The Trenbolone hormone itself remains exactly the same regardless of which ester you are using. Without the acetate or any other ester attached, you would get Trenbolone travelling through and exiting your system very rapidly, making it much more difficult to use.

Trenbolone Acetate Structure
Trenbolone Acetate Structure

Trenbolone Acetate is the most common ester used and it is a faster acting ester than Enanthate It has a half life of about 2-3 days and can be injected every two days, but many users will want to be injecting Tren on a daily basis anyway to keep levels optimal.

Tren Acetate gives you a very quick take up of the hormone and as a result, fast gains. You should start seeing noticeable changes within the first week of using this form of Trenbolone. This also means you can start experiencing the side effects during this time frame as well.

It also clears the system faster so if you do have really bad Trenbolone side effects, you don’t have to wait too long for this steroid to exit your system.

Trenbolone Enanthate

This less commonly used form of Trenbolone comes with a much longer half life of 10 days. It comes with exactly the same properties in the Trenbolone hormone as Acetate, it is simply the attached ester which controls the release of the hormone into the body which differs between the two.

Trenbolone Enanthate Structure
Trenbolone Enanthate Structure

Tren Enanthate is a slower release ester, so it takes longer to start feeling the effects of Trenbolone compared with the much quicker working acetate version.

Most bodybuilders will prefer not to use Tren Enanthate because if severe side effects are experienced and you want to stop using the steroid, you have no choice but to wait much longer for the Trenbolone to exit your body, potentially prolonging those side effects for a lot longer than Tren Acetate. It is also more difficult to maintain stable levels of Tren Enanthate, and it takes longer to reach its peak. Overall, Tren Enanthate is a more difficult steroid to manage than Tren Acetate.

Effects of Trenbolone (Trenbolone Benefits)

The two most important and obvious benefits of Trenbolone are massive gains in strength and muscle thanks to its significant anabolic nature.

Trenbolone is not only used in bulking cycles though. It is excellent for fat loss and cutting as well.

By using Tren in a cutting cycle, you get to maintain strength and maintain existing muscle because Tren has excellent anti-catabolic properties particularly with the way it can inhibit the stress hormone cortisol, which increases catabolism.

It’s not easy to keep your body in an anabolic state when dieting and cutting, and that’s the role Tren will play in such a cycle. Without it you are almost certain to lose not only fat, but muscle as well.

You’re not likely to find a better mass building steroid than Trenbolone and critically, we are talking about quality weight gain. Without water retention, all gains are muscle. Tren can also help you control any gains in fat while you’re building muscle.

You should eating not a huge amount of above regular maintenance levels, but certainly in surplus. This will still be promoting gains in fat but Tren’s powerful metabolic functions go a long way in how much of your weight gain will be fat. This won’t be an issue while cutting when you’re eating at a calorie deficit.

Trenbolone promotes production of red blood cells and Insulin-Like Growth Factor-1 (IGF-1). IGF-1 has a powerful anabolic effect on skeletal muscle and is vital for the process of producing more protein. This essentially means Trenbolone is directly causing the growth of muscle. Increased red blood cells carry more oxygen and nutrients to the muscles In practical terms you will see greater muscular endurance and improvements in recovery.

One of the big benefits as that has come out of Tren being used to grow cattle is the way it promotes increased nutrient efficiency. You will get more nutrient availability from what you’re eating. This doesn’t require eating a greater amount; it simply means your body is more effectively using each and every nutrient you’re already consuming.

So how much could you gain from a Trenbolone cycle? In a 2 month/8 week cycle, consider a 15-20 pound lean mass gain as entirely doable. But you’ll need to have near perfect diet and training programs to get to that level. Most guys will be pretty happy with gains in the 10-15 pound range, and this is considered to be the lower end of what’s possible with Trenbolone.

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Trenbolone Cycles and Stacks

A Trenbolone cycle or stack can be designed as either a mass gaining or cutting/fat loss cycle.

Beginner Trenbolone Cycle

As I’ve said a number of times already, Trenbolone really isn’t a steroid that beginners should be looking at. Jumping into the deep end with Tren as your first compound is going to potentially turn you away from steroids forever (which might or might not be a good thing!).

So let’s consider a beginner Trenbolone cycle as one for you if you have already used at least one or more other steroids in the past. You’re a new Trenbolone user but not a beginner steroid user. In this case an ideal dosage is 200mg weekly, which you can take at 50mg every two days. This is a solid cutting dose that will ensure no loss of muscle while dieting.

  • Weeks 1-8: Trenbolone Acetate 200mg weekly
  • Weeks 1-8: Testosterone Propionate 400mg weekly

Besides dosage, what makes a beginner cycle is the fact you won’t be stacking any other compounds besides the necessary testosterone.

Intermediate Trenbolone Cycle

The next step is to increase your Tren dosage if you’re tolerating it well at lower doses. This can be in the range of 300mg to 400mg weekly. At such a dose you will see substantial physical changes and quite rapid muscle growth.

  • Weeks 1-8: Trenbolone Acetate 400mg weekly
  • Weeks 1-8: Testosterone Propionate 100mg weekly
  • Weeks 1-4 only: Dianabol 25mg-50mg daily

Most users won’t want to go beyond this already high dosage of Tren, but if you’re hardcore enough and tolerating the side effects then you can step up to a more advanced cycle. An intermediate cycle may include an extra compound, in this case Dianabol, to give the cycle a mega kick start. Testosterone is still limited to hormone replacement dosage in this cycle.

Advanced Trenbolone Cycle

An advanced cycle will start including one or more additional steroids, as well as increase the length of the cycle and so allows us to make good use of the slower acting enanthate form of Trenbolone (however you could easily swap it for Acetate if you prefer).

  • Weeks 1-12: Trenbolone Enanthate 500-800mg weekly
  • Weeks 1-12: Testosterone Enanthate 100mg weekly
  • Weeks 1-12: Masteron 400mg weekly

You can expect quite severe side effects at doses higher then 400mg weekly and this cycle should only ever be considered if you have tolerated intermediate level doses. Some guys will stretch to 600mg per week and simply live with the adverse effects or find ways to mitigate them. Only the most hardcore pro bodybuilders will venture at doses higher than 600mg.

Stacking Trenbolone

Trenbolone is very effective as a sole steroid (provided testosterone is also used) and even very advanced users will still choose not to stack it with other compounds, simply because of Tren’s immense power. Only when an extra capability is needed would stacking be considered.

One of the best compounds to stack Tren with is Masteron, with this being a potent recomposition combination. They have a reputation for stacking well together and as Masteron is a fairly mild steroid, your side effect risk profile will not rise considerably.

  • Weeks 1-8: Trenbolone 200-400mg weekly
  • Weeks 1-8: Masteron 200-400mg weekly
  • Weeks 1-8: Testosterone 100-200mg weekly

Even at low doses of each, the results can be dramatic for a cutting cycle.

Trenbolone Dosages and Administration

As mentioned, we don’t need to be using high doses of Tren to get its maximum benefits. With higher doses your side effects are going to get more and more severe, until you get to a point where you’re not enjoying the benefits and instead spend all your energy on mitigating the adverse effects.

Medical Trenbolone Dosage

Trenbolone is not used medically in humans, so there is no officially recognized safe or recommended dose for people. To gain some perspective on bodybuilding doses, cattle are implanted with 200mg of Trenbolone acetate – and cattle weigh over 1000 pounds.

We can therefore see that most bodybuilding dosages on a per weight basis are substantially higher than that given to the only medical use of this steroid, which is in animals.

Bodybuilding Trenbolone Dosage

It’s entirely reasonable for a beginner to start with under 200mg weekly and he WILL see some great Trenbolone results. A lot of guys won’t desire going any higher simply because you’re more easily able to balance out the side effects.

At the most extreme end we have the most hardcore users not afraid of using 800mg or even 1000mg of Trenbolone per week, but for most people this is considered excessive with unbearable side effects.

Proper Administration and Timing

With Trenbolone Acetate’s shorter half life, it is ideal to split your weekly dose into an every other day administration. This allows you to keep up optimal blood levels of the hormone. Advanced users are known to inject the steroid every single day so that the hormone is constantly at its peak. This strategy is most often used while dieting and during the short time prior to a competition.

Trenbolone Risks and Side Effects

Trenbolone’s power and potency unfortunately isn’t just limited to the positive results you can get with it. It’s reputation for side effects is just as legendary (actually, probably more so) as its benefits. That’s because Tren’s notorious side effects can break even the most hardened steroid users.

If you don’t know what to expect, you could be in for a massive shock when using Trenbolone for the first time. And even if you do know what you expect, or if you’ve read dozens of accounts from other users, it still can’t really prepare you for Trenbolone’s side effects.

But it’s well worth saying that just because you’ve read about the worst stuff Trenbolone can do to you, it doesn’t mean it will happen to you. Every individual will respond differently! But you definitely gotta be aware of the worst scenario, and with Trenbolone it can be very bad indeed for some people.


First, the good news. Trenbolone does not aromatize, so it doesn’t cause a conversion to estrogen. This is good news for avoiding gyno, bloating and other estrogenic side effects. Unfortunately, estrogenic type activity can come about through another mechanism with Tren so you don’t actually get a full escape from these side effects either.

This is thanks to the way Trenbolone binds to progesterone receptors which causes an increase in the levels of this female hormone. This then leads to potential gyno and and fluid retention – but not everyone is sensitive to this.

Again this is a side effect that will differ between individuals, but more sensitive guys can easily find themselves dealing with what are some of the familiar estrogenic side effects, even though Trenbolone is non-aromatizing. You should be able to effectively reduce progesterone levels and in turn eliminate these side effects by using an estrogen blocking drug such as Fulvestrant.


As we know, Trenbolone’s androgenic rating is sky high and this means if you’re sensitive to androgenic side effect you are almost certainly going to experience them on a Tren cycle. This includes possible hair loss, acne and skin oiliness, and enlargement of the prostate.

If you are genetically predisposed to baldness, Tren will very likely make it happen sooner. The same goes for acne for those genetically inclined, but acne will usually clear up after a cycle ends.


Trenbolone is a very suppressive steroid. Many steroids will reduce your testosterone production, but Tren is almost certain to shut it down completely. This means post cycle you’ll have no natural testosterone production at all.

One of Tren’s most dreaded side effects is shrunken balls, or in medical terms: testicular atrophy. This leads to reduced testosterone since Trenbolone is such a powerful androgen. The body is getting the message that there’s a big artificial increase in testosterone, therefore natural production reduces significantly or stops altogether. Without the requirement to produce testosterone, the testicles shrink in size.

Many Trenbolone users will include hCG in the cycle to help combat reduced testicle size. There’s no need to take hCG everyday though. It’s effective when taken every three or four days at doses around 250iu, but this will depend on your Tren dose and how you’re being affected.

Even at a low dose, Trenbolone will reduce testosterone levels pretty severely and can keep the levels down for a significant time. So any Trenbolone by necessity requires you to add Testosterone to your stack to avoid low libido, Tren dick (erectile dysfunction) and the countless other debilitating symptoms of low testosterone. With a proper post cycle therapy plan any reduction in testicle size should reverse and have you back to normal within a few weeks.

Cholesterol and Cardiovascular

Tren’s negative impacts on cardiovascular can be considered its most serious physical side effect. By causing negative changes to your cholesterol levels, with regular use or at too high doses, this steroid comes with a legitimately high risk of causing severe cardiovascular strain, high blood pressure and in the worst case scenario: heart disease.

Cardio workouts are important when you’re using Tren, and most guys will want to supplement with an omega-3 product. Importantly we should avoid stacking Tren particularly with any oral steroids due to their own negative impacts on cholesterol.

Higher doses of Tren can reduce your cardiovascular capacity, making it harder to breathe during intensive exercise. This is known to be a dose dependent side effect and one which affects individuals differently. It should disappear once you stop using Trenbolone, but asthmatics should be especially cautious about these possible breathing problems that can develop.

Liver and Kidneys

All steroids will put stress on the kidneys and liver, and Tren is not known for being any worse than other compounds in this regard. It is common for the urine to develop a darker color when using Tren, but this is considered normal and not due to kidney damage and should not be mistaken for blood. As always, if you have any existing kidney or liver health issues, avoid any use of Trenbolone.

Most of the above side effects are expected when using many other steroids as well. But there are also some potential side effects that are more unique to Trenbolone. Not everyone will experience all or any of them, but they can include:

Mood and psychological changes

This is an area that Tren is notorious for, and is not a big issue or even an issue at all with most other steroids. “Tren rage” is real for some users, and a general increase in aggressive behaviour and irritability can definitely affect some guys. The way you use this side effect will depend what sort of person you are. If you already have a short fuse, Tren can take you into dangerous territory. Other guys will be able to channel the increased aggression into the gym and leave it out of everyday life.

Sleep problems

Insomnia or difficulty sleeping is a complain reported by some Tren users. More specifically many people find that they almost find it impossible to fall asleep or stay asleep. Obviously this has serious repercussions for your overall health and for your recovery. In more extreme cases, some users will turn to sleeping aid medications to kick through this side effect.

Excess sweating

If you’re someone who already sweats a lot, you might find yourself doing so a lot more when using Tren. The increased metabolic rate this steroid induces can increase your perspiration and this can occur at more unusual times such as night time (which can also feed into difficulty sleeping). Any Tren users suffering with extreme sweating should ensure water intake is increased to prevent dehydration.

Tren cough

This side effect is so notorious with this steroid that it has its own name. It usually occurs right after injecting and results in a coughing fit type outburst. The cause is poor injecting technique where oil from the solution has made its way into the bloodstream. Although this can happen with any oil based steroid, the intensity of coughing with Tren is usually much more severe.

Erectile dysfunction

Another notorious side effect that gets its own nickname with this steroid is the so called “Tren dick” and relates specifically to decreased libido and erectile dysfunction. This distressing problem occurs because of the way Trenbolone increases prolactin. This is another reason why Testosterone should always be included in a Tren cycle. Some guys will use anti-prolactin drugs or supplements to help combat this issue.

How to Buy Trenbolone?

Trenbolone has no approved use in humans so you won’t find any pharmaceutical grade Tren like we can with some other steroids. This means there are only two avenues to find and purchase Trenbolone: from a veterinary source, which is possible but not particularly easy depending where you live. Or from an underground lab. So most bodybuilders will buy Trenbolone directly from underground labs, or from a local supplier who has sourced it from an underground lab.

When it comes to the veterinary form of Tren, the product is sold under the name Finaplix which is a pellet format. The pellet is implanted under the animal’s skin, and the hormone is slowly released. To turn Finaplix into an injection for bodybuilders, a lab can turn it into a preparation based in oil. This relatively simple process males Tren one of the lower priced steroids available, which can come as a surprise considering how powerful it is.

A major risk when buying from underground labs is the existence of estrogen in the solution. If you’re experiencing noticeable estrogenic side effects after injecting Trenbolone, you may have one these lower quality products.

What Alternatives Are Available?

Nothing can match Trenbolone’s substantial benefits, but at the same time nothing can rival its horrendous downsides either! The fact is that for most people, the negatives of Tren will far outweigh any benefits.

So what alternatives can you look at? Sure, you could consider other steroids instead but you’ll still be signing up for a bunch of awful side effects and legal problems. I wanted something legal, safe and critically, it had to deliver very similar benefits to Tren. I knew nothing would match it totally when it comes to power, but one thing has come close: and that’s Trenorol. It provides the all around benefits of Tren so can also be used for both bulking and cutting, it’s awesome for physical conditioning, and noticeable improves recovery too.

Trenorol promotes nitrogen retention and that’s the underlying mechanism for how it speeds up muscle growth and also helps burn fat while retaining muscle on a cutting diet. There’s no water retention with Trenorol and you should see greatly improved vascularity which leads to a defined and hard physique that is so sought after by Trenbolone users.

It might take Trenorol a little longer to start delivering results compared to Trenbolone (but still only a few weeks), and this is a small compromise that I’m happy to make to totally, completely, 100% avoid all the dreaded side effects of Trenbolone. Trenorol is simply the best legal alternative to Trenbolone I’ve come across to date.

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Trenbolone FAQs

What type of steroid is Trenbolone?

Trenbolone is a Nandrolone derived steroid. It is known as a 19-nor compound due to its chemical modification and other specific chemical modifications that, while appear to be minor, result in the substantial androgenic and anabolic strength of Trenbolone which is five times more powerful than Testosterone.

What are the side effects of using Trenbolone?

Tren comes with many side effects, perhaps the longest list of side effects of any steroid. These range from cardiovascular side effects, to erectile dysfunction, and possible serious changes to mood, aggression and sleep which can have wide ranging consequences in all aspects of your life.

Does Trenbolone cause hair loss?

In males who are predisposed genetically to male pattern baldness, Tren is going to make this happen sooner. However Trenbolone will not cause men to lose head hair if they were not already genetically inclined for it to happen later in life.

Is Trenbolone good for beginners?

Tren is not considered an ideal steroid for new users simply because it has very powerful effects and some serious side effects. New steroid users are strongly advised to gain experience using milder steroids, such as running a few cycles on testosterone only before giving Trenbolone a go. When a beginner is ready to try Trenbolone, a low end dose of 200mg per week is the recommended starting point.

What’s the difference between Trenbolone Acetate and Trenbolone Enanthate?

The only difference is the ester attached to the hormone which controls the rate of release of Trenbolone after you inject. Tren Acetate is a much faster release form, while Enanthate is slow with a longer half life. Most users will go for Trenbolone Acetate because it is much easier to optimize your levels, and the steroid leaves your body quick so any negative side effects will disappear sooner if you decide to stop your cycle early.

Trenbolone is not legal for use in people. It is only legal to be used by veterinarians. Like all steroids, Trenbolone is classed as a prohibited substance and is also banned by all world sporting authorities. Buying and using Trenbolone for bodybuilding puts you at risk of all sorts of legal complications including possible fines and jail.

How long does it take for Trenbolone to start working?

The most common form of Tren is Trenbolone Acetate and this is a fast acting ester. It means you can start seeing results within about a week of starting a Tren cycle. Trenbolone Enanthate takes quite a bit longer to start kicking in, usually around the 4 week mark, so you will need a longer cycle when using that ester.

How does Trenbolone Acetate build muscle?

The most powerful function of Tren when it comes to promoting muscle gains is that is able to directly produce IGF-1 (insulin-like growth factor-1) which is a critical hormone for muscle growth and recovery. Tren is also very effective at boosting nitrogen retention in muscle which leads to swift and large gains, while increasing red blood cell production which carries more oxygen to the muscles; increasing your workout capabilities substantially.

Can women use Trenbolone?

Despite its towering androgenic rating, some women take the plunge and try Trenbolone. Women can expect some extreme virilization and very quickly. While enormous gains in strength, muscle and fat loss are possible, very few women will be willing to risk the high rate of virilizing side effects that Trenbolone will produce.

Final Thoughts

Trenbolone is a superpower steroid. We can reap a lot of benefits from Tren, but is it worth it? For the hardest of hardcore bodybuilders whose entire existence hinges on getting as massive and ripped as possible at any cost – sometimes even costing their life – the answer could be yes.

But for the rest of us bodybuilders and competitors, Tren’s downsides can’t be so easily written off. Trenbolone’s pros and cons should now be obvious:

PROS: Tren is great steroid if you can tolerate it. And that’s a big if, because a lot of guys can not. If we look purely at a results perspective, Trenbolone can deliver what most other steroids can’t come close to. You can gain massive amounts of muscle, or use it for cutting where it’s going to retain lean muscle like nothing else. The strength gains Trenbolone delivers are outstanding.

CONS: A lot of guys just can’t tolerate using Tren at all for various reasons. For some it will be the aggression and mood changes which can cause major issues in relationships, work and life in general. For others it’s the insomnia and anxiety, or loss of libido and erectile dysfunction. Tren comes with a lot of side effects we don’t see with other steroids and these can be a deal breaker for a lot of guys.

Untold numbers of guys have quit a Tren cycle after not being able to handle the side effects. We don’t really see this happening a lot with other compounds where you can usually push through to the end.

About the Author
Juice Lewis, Author of
Juice Lewis

Real-life Experience, not Theory

I don't claim to know everything; what I talk about here is something I've done. From anabolic steroids to HGH, to peptides, insulin, and supplements, I've done it at some point in my life, and I can relate.