Is Clenbutarol Safe?

It’s no secret that the bodybuilding, fitness and sports industries have been plagued with performance enhancing drugs for a long time.

This is because everyone looks for a shortcut to attain their dream physique. But many forget the risks that illegal substances such as Clenbuterol come with, and how it can damage their health when abused.

In this article, you’ll learn:

  • What Is Clenbuterol and What Does It Do?
  • Is It Legal?
  • Side Effects of Clenbutarol
  • Better Alternatives
  • Conclusion

What Is Clenbuterol and What Does It Do?

Clenbuterol Hydrochloride (often referred to simply as ‘clen’) is officially known as a ‘sympathomimetic agent with β2-agonist properties’ [1].

It’s a beta agonist (meaning it works as a bronchodilator and decongestant) that’s been used to treat those suffering from breathing disorders, such as asthma, in the past [2]. But it wasn’t long until research examined whether it could improve the sporting performance of athletes.

Promotes Muscle Growth & Recovery, And Fat Loss 

You might already be aware that Clenbuterol is used by gym-goers to help them make gains; this is because studies have shown that Clenbuterol can help rats pack-on muscle mass, as well as help their muscles recover much quicker too [3].

Clenbuterol has also shown to be an effective thermogenic, helping rats boost their metabolism by raising their heart rate and body temperature to promote fat loss [4].

So with a range of benefits, it’s seems easy to understand why Clenbuterol has become an increasingly popular bodybuilding drug. But the truth is that it’s neither the safest or best option at helping you transform your physique.

Also, it’s important to point out that most studies that show Clenbutarol to be effective at promoting muscle growth or fat loss have been conducted on rats – not humans.

Is Clenbuterol Legal?

While Clenbuterol isn’t a steroid, it’s still not legal for human use in the UK & USA. Although, some countries such as Germany, Italy and Spain still allow Clenbuterol usage to solely treat asthma patients.

If you’re a competitive athlete, then you’ll especially want to avoid this drug; this is because Clenbuterol has been banned from use in competitive sports due to its ability to enhance sporting performance.


Side Effects of Clenbuterol

So we’ve established that studies show Clenbuterol is believed to help you build muscle, as well as burn fat too.

Pretty much the dream drug, right bro? Not when you look further…

Remember that if something sounds too good to be true, then it usually is. And there’s a reason why Clenbuterol isn’t legal for human use in the UK & USA.

In this section, we’ll analyze the side effects that Clenbuterol has been documented to cause.

Cardiac Hypertrophy

One risk that every user of illegal performance enhancing drugs takes, is suffering from cardiac hypertrophy. In fact, a study by Wong, K et al [5] actually concluded that Clenbuterol was a specific cause of this.

Why is this bad? Well, it increases your risk of cardiac arrests, among a variety of other side effects.

Here’s the list of potential issues [6]:

  • Cardiac arrest
  • Tachycardia,
  • Widened pulse pressure
  • Heart palpitations
  • Chest pain
  • Tremor


Anxiety is one of the more common side effects from taking Clenbuterol. In fact, one study found that anxiety was among the highest complaints from patients at the Emergency Department that had been using this drug [7].

Also, there are many users of Clenbuterol that complain about feeling very nervous and anxious on bodybuilding forums. So it seems fair to say that this isn’t a ‘rare’ side effect from taking this drug.


We mentioned that Clenbuterol is able to cause rapid heart rate and palpitations. Well, this is because it’s short term effects are similar to that of stimulants [8].

For this reason, it’s no surprise that Clenbuterol is known to be capable of causing problems with sleep, such as insomnia. A quick search on forums will confirm this to be the case.

Ultimately, this can lead to a vicious cycle, with a lack of sleeping being able to fuel anxiety and heart problems too.


Better Alternatives

When aiming to make big changes to your physique, remember that it’s much better to put your health first.

There’s no point consuming illegal substances that are likely to cause long-term damage to your health; remember that side effects such as cardiac hypertrophy will affect you forever.

As a result, we recommend that you consume natural ingredients that keep you safe, while delivering benefits to help make your fitness journey easier.

Fat Burner Supplements

The main reason gym-goers would choose to take Clenbuterol, is to help them cut body fat.

Well, instead of risking serious side effects, you would benefit more from a natural fat burner supplement.

How do they work? 

Natural fat burner supplements contain numerous thermogenic ingredients that are proven to raise your metabolism and help you shred body fat.

While most will contain many nutrients, only the best fat burners will contain ingredients capable of supressing your appetite; reducing your calorie intake can be equally (if not more) effective as boosting your metabolism to promote fat loss.

The best nutrients include:

  • Green Tea Extract
  • Cayenne Pepper Extract
  • Green Coffee Bean Extract
  • Glucommannan Extract

See SpotMeBro’s Highest Rated
» Fat Burner Supplements Here «

Testosterone Booster Supplements

Another reason why some choose to supplement Clenbuterol is as a steroid alternative, in order to gain muscle mass.

Well, natural testosterone boosters can help deliver the same benefit, without risks of side effects – if you choose the right product containing the right ingredients.

How do they work? 

The best test boosters will contain 100% natural nutrients that have shown to raise your T levels in clinical studies.

For example, one of the best ingredients available for this is Vitamin D3; this is naturally synthesized by your skin when exposed by sunlight, which is why you feel happier in sunny weather.

The best nutrients include:

  • Vitamin D3
  • D-Aspartic Acid
  • Fenugreek Seed Extract

See SpotMeBro’s Highest Rated
» Testosterone Booster Supplements Here «


It’s only natural for people to search for shortcuts when craving results – especially when aiming to improve their physique.

Working hard in the gym can be tough, but there really isn’t any substitution for hard work and natural ingredients.

Ultimately, illegal substances put serious stress on your body; this can result in serious, long-term side effects that you simply don’t want to live with later in your life.

As you now know, Clenbuterol isn’t known to be the safest of drugs, which is exactly why it’s banned from human use in the UK & USA.

But we also understand it’s only natural to want results, fast.

To make quicker changes to your physique, we recommend choosing 100% natural supplements. These will keep you safe, while making your fitness journey easier and more enjoyable than before – without putting you at risk from side effects, as long as you choose the best products available.

If you’re main goal is to lose body fat, then see our best fat burners page. But if you’re more interested in packing-on muscle mass, then check out our best test boosters page.

[1]  Perry, H. Clenbuterol: a medal in tablet form?. Br J Sports Med. 1993 Jun; 27(2): 141.
[2] Boner, A. L. Bronchodilating activity of oral clenbuterol in asthmatic children after single administration of different dosages. Pediatr Pulmonol. 1987 Jan-Feb; 3(1): 34-7.
[3] Carter, W. J. Effects of clenbuterol on skeletal muscle mass, body composition, and recovery from surgical stress in senescent rats. Metabolism. 1991 Aug; 40(8): 855-60.
[4] Rothwell, N. J. Influence of clenbuterol on energy balance, thermogenesis and body composition in lean and genetically obese Zucker rats. Int J Obes. 1987; 11(6): 641-7.
[5] Wong, K. Clenbuterol induces cardiac hypertrophy with normal functional, morphological and molecular features. Cardiovasc Res. 1998 Jan; 37(1): 115-22.
[6] Spiller, H. A. A descriptive study of adverse events from clenbuterol misuse and abuse for weight loss and bodybuilding. Subst Abus. 2013; 34(3): 306-12.
[7] Bilbao, G. J. Clenbuterol poisoning. Clinical and analytical data on an outbreak in Móstoles, Madrid. Rev Clin Esp. 1997 Feb; 197(2): 92-5.
[8] National Drug Strategy. Performance and Image Enhancing Drugs – Clenbuterol. Australian Government; Available online:

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