Clenbuterol – Does Clen Really Work For Effective & Safe Fat Loss in BodyBuilding?

Clenbuterol is known for its solid benefits but also very bad side effects. This article discusses the legality of buying Clenbuterol this substance online.



Men have always been fascinated with obtaining a lean and ripped physique. Even if it means taking steroids like Clenbuterol.

Some people prefer to use legal thermogenic fat burners. But many choose to use steroid-like chemicals in hopes of getting their ideal body.

This desire to get lean and burn fat is not exclusive to men. That’s because women too use Clen to get slim and sexy. Many of these men and women are also well-known celebrities and athletes.

Unfortunately, most new users or people looking to buy Clenbuterol online are unaware of its dangers. They sometimes overlook the problems that can arise from using this banned fat-burning steroid.

Let’s look at both, the pros and cons.

What is Clenbuterol?

Clen is a street name for Clenbuterol. This steroid-like substance is made up of Clenbuterol Hydrochloride.

The chemical formula is C12H18Cl2N2O.

The chemical name is Benzenemetanol, 4-amino-3,5-dichloro-α-[[(1,1-dimetyletyl)amino]metyl]-

Clenbuterol Formula

Clenbuterol was originally intended as a drug to help treat breathing problems and disorders like asthma as a potent bronchodilator. If you didn’t know, a Bronchodilator is a drug that dilates the blood vessels. As the blood vessels dilate, blood oxygen levels are elevated.

This, in turn, reduces blood pressure and releases more insulin. These drugs are used to counter asthma, COPD, and other breathing problems.

Clen is also known as a sympathomimetic and potent decongestant. It thins your blood and counters high blood pressure.

A common misconception is that Clen is a steroid.

It is not.  In fact, it is a steroid-like chemical that’s classified as a stimulant.

It is one of the most researched Beta 2 adrenergic receptor agonists drugs. I have also found that these drugs can be separated into short, long, and ultra-long, an acting agonist.

And Clen is a long-acting agonist. Some countries prescribe Clenbuterol legally as an airway dilator for horses.

This steroid-like substance also increases lean meat yield in animals. However, Clen is widely used off-script by men and women as a fat burner.

Many athletes have been caught using this stuff to enhance their athletic performance. Celebrities have also admitted to using it to stay slim and lean.

Why Is Clenbuterol Banned?

The main reason Clenbuterol’s banned in the US is due to its dangerous and potentially lethal side effects.

However, some countries in Europe and Latin America sell it with a prescription.

The World Anti-Doping Agency officially prohibits clen from almost every pro sport.

Heart Attack is one of the major side effects. This illegal substance is very toxic for the heart and is like putting a V8 engine in our heart.

Clenbuterol increases the heart rate to a very high value which is very dangerous.

Heart failure and death can be a result of excessive heart rate.

Apart from this, there are various other side effects of Clenbuterol.

Clenbuterol Side Effects:

Clenbuterol Side Effects

The list of harmful side effects of Clenbuterol:

  1. Increased Heart Rate:

    We know Clen increases heart rate. But it’s also a fact that the increase in heart rate can worsen health problems, especially those related to blood pressure and the heart.

  2. Restlessness:

    The sharp increase in energy levels can give rise to restlessness and a sense of uneasiness. This effect can worsen if Clen is stacked with other similar stimulants.

  3. Jitteriness:

    Jitteriness, or tremors, is one of the most common side effects of Clenbuterol. It’s usually most noticeable at the early stages of use. Some people find the side effect too strong, preventing them from using Clen.

  4. Sweating:

    The boost in thermogenesis and metabolism with this drug causes you to sweat. However, you may sweat a lot more than expected with this drug which could severely dehydrate your body.

    So, drink plenty of water to stay well hydrated when on this stimulant.
  5. Headaches:

    Headaches are another common side effect of this steroid as the stimulant increases energy levels in the body and brain.

  6. Vomiting:

    Clen has been known to cause vomiting for some users. I found this is caused because of the harsh effects of the drug on the body.

  7. Reduced Bone Strength And Density:

    Clen causes the weakening of the bones’ microarchitecture, reducing bone density and strength. This can also increase your risk of bone fractures.

  8. Nausea:

    The stimulant nature of the steroid causes nausea and headaches for users. Some say that this usually stops after a week or two of use.

  9. Anxiety:

    Anxiety is a common side effect for most chemical stimulants available. The anxiety can get so bad that some require anti-anxiety medications to counter the problem.

  10. Muscle Cramps:

    Muscle cramps can affect workout performance. Those who perform high-intensity workouts experience this most often.
    This happens due to Clenbuterol depleting Taurine levels in the body.

  11. Breathing Difficulty:

    While I found this counterintuitive at first, it does make sense. The increase in heart rate and a rise in anxiety can make it difficult for some to breathe properly.

  12. Insomnia:

    Difficulty falling sleeping Is a big issue for many people. Those who try Clenbuterol have found the effects of a single dose to last more than a day.

    The half-life of this steroid can last up to 34 hours. This is due to the drug’s stimulant nature.
  13. Hypertension:

    Hypertension occurs when your blood pressure rises to dangerous levels. Prolonged cases of hypertension can degrade the heart, leading to heart failure.

  14. Heart Palpitations:

    The increase in heart rate can overstress the organ. If this happens, you may experience heart palpitations or fluctuation in a heartbeat rhythm.

  15. Weakened Heart:

    This drug degrades the heart by weakening the heart muscles. I found the higher collagen production to be the root of this problem. A weakened heart will reduce the pumping ability of the heart.

  16. Enlarged Heart Muscles:

    The weakened heart is forced to increase heart muscle size to maintain sufficient blood flow. This serious problem can lead to arrhythmias for some.

  17. Heart Failure:

    Clenbuterol can cause your heart to weaken and degrade. Over a period, this can result in heart failure and sudden death.

I found these on Reddit forums about some users with bad episodes of side effects from taking Clen:

Clenbuterol Review - User Testimonial On Side Effects By David_Putty_

David Putty here found out that Clen causes him seriously intense Anxiety attacks. He was strongly against Clen and vowed never to use it again.

Clenbuterol Review - User Testimonial On Side Effects By DruPDrawers

DruPDrawers here experienced insomnia and shakes. He also recommended against using Clenbuterol.

These should give you a better understanding of how real users experience the side effects of Clen.

Athletes Caught for using Clenbuterol:

Some athletes and bodybuilders continue to use this drug illegally for fat loss and performance.

It’s a sad and unfortunate reality that while it gives great results, this drug has some serious side effects.

Alberto Contador is a Spanish professional cyclist who was banned for two years after being found guilty of doping.

In 2010, Contador’s urine samples found traces of Clenbuterol.

This led to his victories being stripped from him which included his 2010 Tour de France.

A list of athletes caught for using Clenbuterol:

  • Alberto Contador for Cycling
  • Canelo Alvarez for Boxing
  • Lainer Bueno for Baseball
  • Kim Ji-heun for Swimming
  • Li Fuyu for Cycling
  • Guillermo Mota for Baseball
  • Jessica Hardy for Swimming
  • Adam Seroczyński for Canoer
  • Carter Ashton for Hockey
  • Katrin Krabbe for Athletics
  • Nigel Levine for Athletics
  • Petr Soukup for Bodybuilding
  • Moises Cedeno for Baseball
  • Lucas Browne for Boxing
  • Michael Rogers for Cycling
  • Francisco Vargas for Boxing
  • Raul A. Mondesi for Hockey
  • Erik Morales for Boxing
Other than professional athletes, many celebs also use Clen.

Britney Spears, Lindsay Lohan, and Victoria Beckham have all admitted to using Clen.

They claimed it helped them lose weight and get slim.

So, it seems that even Hollywood stars risk their lives with this stuff to get slim for the cameras.

Why Do People Use Clenbuterol?

Its use as an off-label fat burner is the most popular reason people buy Clenbuterol.

The increase in the body’s metabolic rate and fat burn is because of the principle of thermogenesis.

Many users try to gain muscle, get stronger and improve performance by taking help from other anabolic steroids.

However, there are also people who only use Clenbuterol for its weight loss properties without any other anabolic steroid.

While Clenbuterol can help with the fat burn, especially in regards to stubborn fat, it still isn’t the magic pill.

It’s actually the increase in the rate of fat burn achieved that is the advantage.

In short, the actual weight loss process still requires the user to work out while the fat burner boosts fat burn.

You can get ripped by boosting the metabolic rate using Clenbuterol. However, unlike what some articles online state, Clenbuterol doesn’t actively burn and eliminate fat cells.

Clenbuterol Boosts Metabolism

Clen stimulates the beta-2 receptor to heighten the basal metabolic rate.

The increase in metabolic rate helps burn more fat which produces more energy in the form of glycogen.

The glycogen that is released comes from the liver and skeletal muscles, resulting in more energy and less fat.

Clenbuterol Stimulates Thermogenesis

Clen stimulates the metabolic rate and increases cAMP levels, resulting in thermogenesis.

The increase in internal body temperature occurs when the mitochondria in the cells expand more heat.

Elevated temperature improves the metabolic rate and fat loss mechanism further.
Simply put, Clen can help you sweat out more fat so that you can quickly lose weight.

Does Clenbuterol Have Any Anabolic Benefits?

Using Clenbuterol has been shown to help users burn fat while maintaining lean muscle mass. In light of this, some people take this steroid for its anabolic benefits.

Current research has marked Clenbuterol to be only effective as a thermogenic and bronchodilator.

Even so, I found that users have claimed to have experienced the performance benefits of this drug.

That’s why I have listed a few of these claimed benefits for your reference:

Improvement In Athletic Performance:

This is why many amateur and professional athletes use Bute.

It improves athletic performance by providing the muscles with more oxygenated blood via vasodilation.

Performance is also improved because oxygen-rich blood helps improve recovery and suppress muscle fatigue.

Users claim to notice an improvement in workout performance within the first week or two.

List of performance-boosting benefits of Clenbuterol:

  • Boost In Metabolism:

    This substance is known to boost your metabolism effectively.
    The increased metabolic rate will help your body burn more fat while doing the same exercises.
    I always support weight loss products that promote the metabolic rate.
    I find it to be a better method of losing weight instead of starving yourself.

  • Increase In Internal Body Temperature:

    Thermogenesis is one of the basic principles behind the success of Clenbuterol.
    This drug can help increase your body temp by up to 1 degree, aiding metabolism and lipolysis.
    I also recommend you stay well-hydrated with this product as it will cause you to sweat a lot.

  • Appetite Suppression:

    One of the lesser-known benefits of this drug is its ability to suppress your appetite.
    The appetites suppressant works to increase your satiety and reduce your hunger pangs.
    The idea is that if you don’t feel hunger as often, you will be able to control your eating easily.

  • Increase In Energy Levels:

    The thermogenic benefits of this drug lead it to burn fat to produce energy.
    It works similarly to ephedrine as it stimulates your body’s energy production.
    This is why users who take Clen feel excited and jacked up.
    It feels like drinking 15 cups of coffee in just a few minutes.

  • Improvement In Muscle Growth:

    Most studies have claimed no improvement in muscle growth.
    One study, however, found that taking a 2-week-cycle of this drug resulted in a 4.3% increase in lean muscle mass.
    The Reddit forums I checked had a few users who also mentioned they experienced an improvement in muscle gains.

  • Increase In Supplied Oxygen:

    As a Bronchodilator, Bute will expand your airways for more air and oxygen.
    The increase in lung performance will reduce fatigue and muscle soreness. It will also boost your endurance and stamina while working out.

Performance Boosting Benefits Of Clenbuterol

The improved lung performance is why many marathon runners and sprinters take Clen.

Clenbuterol Cycles:

So, how is it that you can get these benefits?

Well, first you are going to have to understand how Clenbuterol Cycles work.

This is because you have to vary how much of the drug you take overtime to maintain potency.

Cycling also helps limit the side effects you have to deal with.

I have found two Clen Cycles that most beginners and experts use for weight loss:

The On/Off Cycle

A majority of users who take Clen use this cycle.

Also, note that this cycle is used for most steroids out there.

This cycle works by alternating between being ‘on’ the drug and being ‘off’ it.

Usually, the cycle lasts for 2-4 weeks where its two weeks ‘on’ followed by two weeks ‘off.’

The claim behind this is that the two weeks off allows the body to rebalance its hormone levels.

Here is a sample of a 2-week cycle for taking Clen. You should note that the dosage is steadily raised and lowered to prevent side effects.

On/Of Cycle For ClenbuterolDosage For Men (mcg)Dosage For Women (mcg)
Day 12010
Day 22020
Day 34020
Day 44030
Day 56040
Day 66060
Day 78060
Day 810080
Day 910080
Day 108060
Day 118060
Day 126040
Day 134020
Day 142010
Week 3OffOff
Week 4OffOff

The Continuous Cycle:

The On/Off cycle is the most common cycle. Those experienced with Clen, however, prefer the Continuous cycle.

Here, you will have to slowly increase the dosage over a period of months until you reach max dosage.

When this happens, you can lower the dosage until you reach min dosage.

Following this, you take a 2-week break and start back again.

The results you get with this cycle are not as apparent within the first weeks.

However, this is what you want to be doing if you want to maintain that shredded body for months.

So, I took a look and found a sample 14-week continuous cycle of Clenbuterol for you:

Continuous Cycle For ClenbuterolDosage For Men (mcg)Dosage For Women (mcg)
Week 12010
Week 22010
Week 34020
Week 46040
Week 58060
Week 610060
Week 710080
Week 812080
Week 9140100
Week 10140100
Week 1112080
Week 128060
Week 136040
Week 144020
Week 15OffOff
Week 16OffOff
Clenbuterol Cycles Misconceptions
Most people say that you have to reduce your dosage before going ‘off’ slowly.

I disagree.

I have found that slowly going off the drug will end up wasting your time and money.

This is due to the reduced dosage not providing your body with the stimulants it needs to burn fat faster.

Instead, I suggest you keep the max dosage until the end where you reduce it to the minimum before going off.

The reason for this is going ‘cold turkey’ is what causes people to experience the backlash.

Clen Products:

Now that you know how to take Bute, let’s take a look at the products that are available to buy.

However, know that these have been designed to be used for horses by veterinaries.

So, unless you have a prescription, you can’t legally buy or use most of these products.

But I have heard of many who buy Clenbuterol online illegally for their use.

A list of well-reputed brands of Clenbuterol:

  • Meditech Clenbuterol in 40 mcg tablets
  • Duopharma Clenbuterol in 20 mcg tablets
  • Malay Tiger ClenoX in 40 mcg tablets
  • British Dragon Clen in 20 mcg tablets
  • LA Pharma Clenbuterol in 20/40 mcg tablets
  • Valeas I Monores in 10/20 mcg tablets
  • Jing Tan Generic Clen in 40 mcg tablets
  • Nihfi (Bulgaria) Clenbuterol in 20 mcg tablets
  • Genesis Labs Generic Clenbuterol in 0.2 mcg tablets
  • Boehringer Ingelheim Ventipulmin in 72.5 mcg/ml syrup
  • Falqui I Contrasmina in 20 mcg tablets
  • Yansuan Clenbuterol HCL in 40 mcg tablets
  • Quimedical PT Broncoterol in 20 mcg pills
  • Thomae G Spiropent in 20 mcg tablets
  • Boehringer Ingelheim Spiropent in 20 mcg tablets
  • Chinoin Mexico Novegam in 20 mcg tablets
  • Alpha Pharma Astralean in 40 mcg tablets
  • Juste ES Ventolase in 20 mcg pills
  • Azncimittel Werk Dresden G Contraspasmina in 20 mcg tablets
  • Sopharma Sofia BG Clenbuterol in 20 mcg tablets
  • Richter A Ventipulmin in 16 mcg/gram
  • Biornedica Foscama Clenasma in 20 mcg tablets
  • Von Boch I Bronchodil in 10 mcg pills
  • Hubei Huangshi in China Clenbuterol in 40 mcg tablets
  • Salus I Prontovent in 0.02 mcg tablets
  • Thaiger Pharma Airclen in 20 mcg tablets
  • SB Labs Generic Clenbuterol in 20 mcg tablets
  • Nimrod Dilaterol Clenbuterol in 25 mcg/ml syrup
  • EURO-MED Clen in 40 mcg tablets
  • Fidelis Cesbron in 20 mcg tablets
  • Shree Venkatesh Clenbuterol in 40 mcg tablets

Facts About Clenbuterol Products:

Note that you can get Clenbuterol as a syrup, powder, nasal spray, inhaler, injection, or pills.

However, the most common of these are the pills.

Also, remember that some products come with pure Clenbuterol Hydrochloride while others have other blends. These can include stimulants like Ketotifen or Yohimbine.

The reason that you should keep an eye out for this is that it can alter the expected side effects.

Is It Legal To Buy Clenbuterol Online?

The FDA has banned the manufacturing and selling of Clenbuterol in the US.

However, overseas manufacturers provide them online.

You have no guarantee for the quality, ingredients, or manufacturing conditions.

Also stopping people from buying Clenbuterol online is that it’s illegal to buy, even from a supplier overseas.

Other countries sell Clenbuterol in tablet or liquid form including China, Russia, and Bulgaria.

But in the US, you can’t even legally purchase it, let alone use it. These are some countries from where most of the illegal Clenbuterol sold in the US black market comes from including China, Russia, and Bulgaria.

Be very careful with buying this stuff as it can land you in jail if you are caught. And buying it online is sure to leave a paper trail you don’t want.

Is It Worth The Risk To Buy Clenbuterol Online?

Buying Clenbuterol in the US is illegal and anyone saying otherwise is misleading or lying to you.

In short, Clenbuterol has dangerous side effects and legal troubles to make the fat-burning benefits worth the risk.

To conclude, instead of Clenbuterol, you are better off trying Clenbuterol alternatives.

That said, if you ignore the side effects, the benefits are unlike any other.

But either way, I still would not use Clen for weight loss or bodybuilding. And I will advise anyone else thinking about it to do the same.

Instead, I like how there are many Clenbuterol alternatives you can get online.

These are 100% legal to buy and made with natural ingredients. The advantage here is that you don’t have to deal with any pesky side effects.

However, the downside of the alternatives is that they are not as quick with the visible results as the drug.

These legal alternatives to Clenbuterol make use of a blend of natural herbs and spices to provide the same thermogenic benefits of the Clenbuterol Hydrochloride in the banned steroid.

Clenbuterol Alternatives Recommendations:

The editors at have frequently researched topics related to bodybuilding. Hence, we constantly are in search of safe and effective bodybuilding supplements.

In any case, I found three Clenbuterol alternatives that are as good as the illegal steroid Clenbuterol. Clenbutrol is the most popular and by far the best alternative to Clenbutrol.

Clenbuterol Alternatives


In this article, we have seen why this steroid-like chemical is so popular. Yes, it does provide fat loss benefits… But at what cost?

This illegal substance comes with dangerous side effects, and you should avoid it at all costs.

There are alternatives available that give similar benefits. Lots of positive customer testimonials back these Clenbuterol alternatives and are the reason why they are so popular.

So, long story short, I strongly suggest you don’t use Clenbuterol at any cost.

About Mikael Gomez

Mikael is a health nutrition expert and loves mountain biking. Mikael started his health product research journey in 2016 and still loves doing it. Apart from spending time on his study, research & literature, he plays basketball regularly and is a fitness freak. Follow Mikael on Linkedin