Clenbuterol – Benefits, Side Effects & Where to Buy

Written by Erny Peibst

Medically approved by Dr Thomas O'Connor
This article is for educational purposes only, we do not encourage the use of illegal steroids and the following isn't to be taken as medical advice.

In this article I'm going to cover everything you need to know about one of the most powerful fat burners in the world – clenbuterol.

Read below to find out about clenbuterol's benefits, its side effects, how to cycle it, how much to take, typical results and where to buy it from. The following is the most comprehensive and in-depth article on clenbuterol you'll find online.

Lets begin!

What is Clenbuterol?

In Hollywood, clenbuterol (street name clen) has been labelled as a ‘new weight-loss wonder drug’, proving to be hugely popular amongst actors, models, bodybuilders and fitness competitors.

…Basically anyone looking to enhance their physique.

Due to the effectiveness of clenbuterol it’s also widely consumed by ordinary members of the public, helping them achieve a similar look to their Hollywood idols.

Is Clenbuterol a Steroid?

Clenbuterol is sometimes wrongly labelled as a steroid; it’s NOT, although the drug does share similar properties to anabolic steroids.

Two of clenbuterol's main attributes are fat-burning and its ability to retain muscle tissue. Steroids such as anavar and winstrol also have similar effects.

When trying to improve your body, the quickest way to do so is to build lean muscle whilst reducing your body fat. Naturally this is quite difficult to do because building muscle requires you to be in a calorie surplus, whereas losing fat requires you to be in a calorie deficit.

Thus the two goals contradict each other and as a result a bodybuilder will often have to go through separate bulking and cutting phases. which can be a painstakingly slow process (3-5 years of hard work).

Not everyone is prepared to wait this long, thus taking a drug like Clenbuterol is an option for those who want faster results.

The irony of Clenbuterol is that it wasn't originally developed to burn fat, but to treat asthma. It’s a bronchodilator that has been used for over 30 years as a respiratory treatment, helping to relax the lungs and improve breathing efficiency.

Like with lots of drugs, the reasons for people taking them differs but in this article we'll focus on the cosmetic/performance aspect of taking the drug.

Why Take Clenbuterol?

In today's society we're rewarded for looking good. Whether that’s driving around in a Ferrari, wearing designer clothes or proudly showing off your bulging biceps and ripped six pack abs on the beach. If you posses some of these attributes you're often rewarded by fame, fortune and social media popularity.

Thus, people are willing to invest time and plenty of money trying to gain an advantage; to stand out from the crowd. This is where clenbuterol comes in…

In order to look good in the bodybuilding world you must be very lean. There are many ways to get ripped such as specific workouts, eating ‘clean' and taking supplements.

Some people are willing to go one step further by taking PED’s (Performance Enhancing Drugs), like anabolic steroids, clenbuterol, and EPO.

If we can ingest/inject substances to make us stronger, recover quicker and look more aesthetically pleasing then it's easy to understand why millions of people take PED's.

How Does Clen Work?

Clenbuterol works as a stimulant by activating the sympathomimetic nervous system. It is a potent beta2-adrenergic agonist, exerting adrenaline-like effects on the body. The stimulant works by enhancing metabolic rate, not by directly burning fat but by raising your body temperature, which in turn burns more calories. Clenbuterol is very popular due to it’s simple and straightforward benefits.

Benefits of Clenbuterol

There have been plenty of studies conducted on clenbuterol, some of the most notable benefits include:

1. Increased Muscle Mass and Strength – Clenbuterol helps increase oxygen transportation around the body. It achieves this by widening the blood vessels that oxygen travels through, meaning both endurance and recovery time are improved.

In other words – it’s easier to train for longer periods of time when taking clen and it allows users to increase the intensity of each set (getting in extra reps or lifting heavier weights). Ultimately this will lead to further gains, such as building muscle or/and reducing body fat levels.

2. Fat Burning – we’ve already briefly touched upon the fat burning properties of clenbuterol. In a nutshell… the drug raises body temperature, and increases metabolic rate, meaning quicker fat loss. The drug is similar to other stimulants such as epinephrine, however clenbuterol is more potent and the effects last longer.

3. Increased Focus – Some users report feeling more alert and focused whilst working out on clenbuterol; with the drug helping to increase the mind-muscle connection, which is imperative when trying to build up specific muscle groups.

4. Suppressed Appetite -  The best way to lose fat from the body is to create a calorie deficit. This means to eat less calories than your body burns each day. The more of a deficit you create, the more fat you'll lose. One of the issues most people find difficult on a diet is the reduction in calories. It’s not fun. Although you want to lose weight it’s difficult eating less food; you can get tired quicker and your mood can drop making it feel like you’re fighting an uphill battle.

The stimulant effects of clenbuterol (mentioned above) keeps your energy levels high when dieting and with clen suppressing your appetite, you can often forget you're even dieting. Add into the mix the added training intensity and also it’s propensity to build muscle; you've got a winning combination for getting ripped.

5. Reduces Stomach Fat – one of the regions men and women really struggle to lose body fat from is the stomach area. Even after dieting for long periods of time there still tends to be a roll of body fat sitting around the midsection, often in the lower abdominal area.

Clenbuterol has been shown to accelerate fat burning from typical stubborn areas. This is mainly down to it spiking your metabolism, increasing your body temperature and expending more energy over a 24 hour period.

6. Increases NEAT Activity – NEAT stands for Non Exercise Activity Thermogenesis, which basically means any extra exercise you get outside of your gym session. For example how many steps you do per day, gardening, washing the dishes, ironing, playing football with your friends at the park, walking up stairs, etc. Basically any extra movement done throughout the day.

Clenbuterol makes it easier to move more throughout the day, which leads to increased overall output, improved general fitness, better cardiac functioning and further weight loss.

With all of these benefits packed inside a bottle of pills, it's no wonder why so many bodybuilders/athletes are taking clenbuterol today.

Celebrities on Clen

hugh jackman

Hollywood actors are some of the most famous celebrities thought to be taking clenbuterol. There's evidence to suggest Hugh Jackman took clenbuterol to get ripped for Wolverine and Sly Stallone when he got shredded for the Rocky and Rambo films. Being able to get into insane shape is crucial in landing big movie roles, enabling them to make millions of dollars.

However, none of this is 100% confirmed as it’s a taboo topic, with actors not wanting to admit to taking performance enhancing drugs encase they lose fans.

Less fans = less people watching their movies.

The main visual symptom of someone taking clenbuterol is they'll have flushed/red skin, which represents someone with an elevated body temperature.

You could also speculate about many other movie stars and models. For example what about Jason Statham, Christian Bale, Daniel Craig? Although their physiques are less extreme than those on a bodybuilding stage, it wouldn't be surprising if they've used ‘additional measures' in order to create an impressive physique.

Forgetting the A-listers and movie stars, everyday ordinary people are also taking clenbuterol, in order to achieve a lean and toned look.

You only have to spend 10 minutes in Ibiza to realise how many impressive physiques are around these days.

For young men and women, taking anabolic steroids or clenbuterol will definitely help you gain a physical advantage. You'll become more desirable to the opposite sex, have an increase in popularity and potentially earn more money. Whether that’s a job as a model or as a social media influencer, who get paid to wear clothes and market products; the rewards can be enormous and is worth the risk for many.

Is Clenbuterol Legal?

In most countries (including the UK and US), the only way to legally get hold of clenbuterol is through your doctor i.e to treat severe asthma. Or to buy it from a country where it's not illegal i.e. get it imported from Mexico or Thailand.

With drugs like clenbuterol it’s absolutely crucial to your gains and health that you buy from a reliable source. As you can probably imagine, there are lots of scam artists who will rip you off, either selling placebo pills. Or even worse… supplying toxic substances which can seriously damage your health, or in some horror cases – kill users.

In recent years there have been many incidents where young men and women have experienced fatal consequences from inducing weight loss substances. Eloise Parry died in 2015 after taking diet pills bought from the internet which contained the ingredient DNP. Although such incidents are rare, it can happen if you don’t fully know what’s in the product.

Buying through the black market naively is the equivalent of playing Russian roulette with your life – is it worth the risk?

Athletes Taking Clen

Many athletes have been banned/punished for taking clenbuterol to gain an advantage over other competitors.

When you’ve been training your whole life to be the best, whether that’s a team sport like ice hockey, rowing, football, rugby or an individual sport like tennis, skiing, running – the temptation to take performance enhancing drugs is enormous.

Especially when other athletes you're competing against are taking drugs, taking them often levels out the playing field.

Taking PED's could be the difference between missing out on an IFBB Pro Bodybuilding Card or winning the Mr Olympia and having a million dollars in the bank. It could be the difference between going down in history forever or being totally forgotten. With so much riding on winning, it’s an easy trap to fall into as a professional athlete.

You only have to look at athletes such as Lance Armstrong or Justin Gatlin to see the level some athletes are willing to go to in order to dominate their sport.

Clenbuterol is an extremely popular drug due to it’s performance enhancing benefits and will continue to be taken by athletes looking to gain a physical advantage.

Clenbuterol Side Effects

flushed skin
Flushed skin – a typical side effect when taking clen

First and foremost the drug must not be used by women who breastfeed or are pregnant. It’s also advised that for anyone suffering with conditions such as glaucoma, hyperthyroidism, heart conditions or high blood pressure should not take clenbuterol.

Of course there are always going to be people that abuse drugs, and push things to the limit, consequently increasing the likelihood of them experiencing more severe side effects.

Like with anything in life, the more you abuse something the more you're likely to experience detrimental side effects. However, the more cautious you are, and the more you do your research, the safer you’ll be.

For most people the side effects of clenbuterol are only temporary and subside quickly. These side effects are:

  • Muscle cramps
  • High blood pressure
  • Excessive sweating
  • Headaches (migraines)
  • Insomnia
  • Anxiousness
  • Blushing of the skin (or face)

Another thing to consider is the negative effects clenbuterol can have on recovery. The 3 major components of building a leaner and more muscular body are:

  1. Training (lifting weights, cardio)
  2. Diet (eating good nutritional foods and adhering to set macros)
  3. Rest and Recovery (sleep, days off training, foam rolling, stretching etc)

With the stimulating effects of clenbuterol it will provide an immediate boost in performance, however in the long run it can leave users feeling burnt out due to over-stimulation and poor recovery.

…Especially if a user is experiencing insomnia and lack of sleep.

Thus if you take clenbuterol, to avoid many side effects, you can take short cycles (we'll discuss the duration of these cycles further down).

Top personal trainer and fitness guru Phil Learney talks about our ‘Adaptive Reserve’ which means a persons ability/capacity to cope with stress. It’s almost like we have a daily bank balance, and every time we put stress on the body, whether physically or mentally we chip away at our daily budget.

If for example you do a 2 hour intensive gym workout that’s going to place an enormous amount of stress on your nervous system.

If we go into our adaptive reserve too much e.g. spend too much money, by overtraining, getting stressed out at work, eating poorly, etc then we go into debt which can then negatively affects our progress and potentially lead to sickness, depression, a weakening of the immune system, poor mood, injury, aches, pains, etc.

Another side effect some people forget to mention is that clenbuterol may be addictive to some individuals. Although clen's not physically addictive, it does stimulate dopamine in the brain – also known as the reward hormone. Dopamine is often thought to be the primary cause of addiction in general, because the brain gets used to the ‘feel good’ aspect and thus wants more.

Thus if you decide to use clenbuterol it’s super important to cycle it and not to abuse it.

How To Cycle Clen & Dosage

clenbuterol pills

So, how much should you take of Clenbuterol? And for how long?

Clen comes in tablet form which you ingest with a glass of water. It’s advised to take clenbuterol in the morning upon waking. If taken later in the day it’s likely to increase the chances of insomnia and poor recovery – something most people want to try and avoid.

To start with, people new to clenbuterol should take a low dosage and run shorter cycles.

Although dosages may differ from person to person, they're normally between 40-160mcg daily.

Whether you take 40 or 160mcg's depends on what the athlete/individual is willing to take and the desired outcome looking to be achieved.

As a general rule of thumb most people consume 120mcg per day (3 x 40mcg tablets).

However, taking any more than this and the positive effects start to drop off and the risks get higher. It’s important not to take too much too soon when taking a new substance.

Clenbuterol cycles can be 2 days on 2 days off, although some people may do longer cycles such as 2 weeks on followed by 2 weeks off. The shorter the cycle, the less risk and vice versa…the longer the cycle the more risk of experiencing negative side effects.

Cycling the stimulant gives your body a chance to recover and reduces the risk of the detrimental side effects such as toxicity building up in the body, poor sleep and fatigue.

How it Affects Sleep

Like any stimulant, clenbuterol can effect sleep. Some people are more sensitive than others. For example there are people who can have 5-8 cups of coffee per day and sleep like a baby. But then there are others who have more than 1 cup and they’re up all night.

As individuals we have different sensitivities to certain drugs and stimulants and if you do suffer with poor sleep, then clenbuterol could make things worse, so be wary of this.

If this happens there are some options to consider:

  • Stop taking the stimulant altogether
  • Make sure to take Clen first thing in the morning upon waking
  • Supplement with magnesium glycinate and zinc. ZMA is a popular sleep supplement too.
  • Unwind 2 hours before bed with a nice, warm, and relaxing magnesium bath

Monitor Progress & Health 

Whilst taking clenbuterol it’s important to keep a daily log of your statistics, not only the physical one’s i.e. weight, measurements, body fat, photos, etc but also the mental ones i.e. how you're feeling each day. Keep a journal and assess the following daily:

  • Sleep
  • Energy
  • Stress levels
  • Workout Performance
  • Digestion
  • Mood

Rate yourself on from 1-10 on how you’re feeling in each of these areas, then assess along the way. Your body is constantly giving you feedback, so make-sure you listen to it. If any of the above are affected then try to assess whether it’s clenbuterol or something else i.e. a bad day at work,  eating poor quality food, etc.

If you want to be really diligent then you could go and have a health check before taking it and then go back every 2 months to see if there are any noticeable underlying changes to your health. The more you monitor and listen to your body the better off you’ll be.

Although it’s recommended that you don’t take clenbuterol for more than 16 total weeks (over the course of a year) people do take more than this, especially bodybuilders with multiple competitions a year, or fitness models with photo shoots each month. At least if you monitor yourself you can prevent any long term damage and make calculated decisions along the way.

Typical Results

It’s impossible to say exactly what results you'll get from using Clenbuterol, as there are other factors that effect your gains.

For example, if a skinny guy who’s never worked out before uses Clen, he’ll just get skinnier – so he may not get great results. However if a guy's been bulking for 6 months then starts using clenbuterol- he’ll get leaner and could obtain a beach body in 4-16 weeks (depending on starting body fat levels).

As a general rule, a person will burn 0.5 – 1% of body fat for each week they take clen.

Even though clenbuterol raises body temperature and reduces appetite, the rate at which you lose body fat will depend on the overall calorie deficit that’s being created. Just because you take clenbuterol doesn't mean you're guaranteed amazing results, you still need too…

  • Train with Intensity
  • Workout regularly (at least 4x per week)
  • Eat well (track calories and consume wholesome foods)
  • Hit your protein targets (at least 1g of protein per 1lb of bodyweight for maintenance, 1.5-2g for muscle gain)

If you do all of this, you'll lose roughly 6 pounds from a 2 week cycle.

Typical Before and After

As previously mentioned, there's evidence to suggest Hugh Jackman and Sylvester Stallone have used clen in the past, due to them having flushed skin, a significant reduction in body fat and increased vascularity.

Here are their transformations:

…These are typical results you can expect from taking clenbuterol if you work hard in the gym and nail your diet.

hugh jackman transformation
Hugh's results are possible from 2 x 2 week clenbuterol cycles


sly stallone before after
Sly's results are possible from 3 x 2 week clenbuterol cycles

Optimal Diet

You’ll hear of people using Clenbuterol, training hard but eating Mcdonalds and Burger King every day, so they're not getting great results. If you're going to take clen so you can eat more junk food then it’s totally counterproductive. As we’ve already discussed, you need to focus on eating well too. Diet is crucial in bodybuilding, and even more so when taking PEDs, to maximize their effects.

Here are some excellent food choices when taking Clenbuterol:

Protein Sources

  • Chicken
  • Turkey
  • Eggs
  • Steak
  • Mince meat
  • Cod
  • Haddock
  • Hake
  • Salmon
  • Tuna
  • Protein powder

Carb Sources

  • Rice (brown, white, basmati)
  • Sweet potatoes
  • White potatoes
  • Pasta (wholemeal or white)
  • Quinoa
  • Porridge oats

Fruit Sources:

  • Apple
  • Pear
  • Strawberries
  • Raspberries
  • Blueberries
  • Orange
  • Banana
  • Grapes
  • Mango
  • Pineapple

Veg Choices:

  • Broccoli
  • Peas
  • Sweetcorn
  • Brussel sprouts
  • Lettuce
  • Asparagus
  • Onions
  • Peppers
  • Mangetout

Fat Choices:

  • Olive oil
  • Rapeseed oil
  • Flaxseed oil
  • Coconut oil
  • Butter
  • Peanut butter
  • Almond butter
  • Dark chocolate
  • Almond nuts
  • Brazil nuts
  • Hazelnuts
  • Walnuts

Drink Choices:

  • Water
  • Squash (low calorie)
  • Diet Coke
  • Coke Zero
  • Pepsi Max
  • Diet Drinks

Meal Plan

steak and vegetables

Although the quantities and foods may differ from person to person, a sample meal plan for someone using Clenbuterol could look something like this:

Training Day: (high protein, medium carb, low fat)

Breakfast: Porridge oats with whey protein, almond milk and honey

Lunch: Chicken, rice, with vegetables

Dinner: Turkey, sweet potato fries, with vegetables

Snacks: Protein shake, fruit

Non-Training Day: (high protein, low carb, medium fat)

Breakfast: Eggs cooked in butter

Lunch: Mince meat with vegetables

Dinner: Steak cooked in olive oil served with vegetables

Snacks: Protein shake, nuts

Where to Buy Clenbuterol?

clenbutrol for sale

There are multiple places to purchase clenbuterol. You may be able to buy at your local gym, although this is likely to be an underground type of operation and is illegal. It also requires 100% trust in who you are buying from as it can be risky.

You can also buy online, make-sure you do thorough research though as there are scammy dealers.

If you can, talk to somebody who’s used Clen and ask them how they got on, and what source  they bought from.

You can also look for online reviews, be careful though, lots of companies will pay to get fake testimonials in order to boost sales. They don’t care about the product and who buys it – as long as they make shed load of money! This isn't somebody you want to buy from.

Tip: Look for external websites who blog about clenbuterol products, look for honest reviews who list the negatives about the product, if there's no form of criticism in a review – it's because it's a fake one.

One of the most popular companies online for selling legal steroids is CrazyBulk, who sell a legal clen alternative called – Clenbutrol. You can read their customer testimonials here.

Is It Worth It?  

There’s no doubt that taking clenbuterol can dramatically improve your performance and body composition. It will increase strength, torch away unwanted body fat and increase your energy levels. But whether or not you should take it is always a personal choice.

Being an illegal drug, doctors do not recommend taking it, especially if your intention is solely to improve athletic performance or body image. But then a bodybuilder who takes it regularly, who has an an amazing physique and doesn't experience any noticeable side effects, may say otherwise.

Before taking Clen it’s advisable to get a health check up to make sure everything's in working order before starting a cycle. For example, if your blood pressure is already high and then you start taking clen – it's only going to elevate it even higher.

Jordan Peters is one of the most intelligent bodybuilders in the world, and he discusses performance enhancing drugs very openly on his website. He often reiterates the point that although PED’s make a big impact they're only a part of the puzzle.

The ability to train hard, be strict with your diet, and take care of your overall health should always be the main focus. He believes that if clenbuterol effects sleep and is detrimental to life outside of the gym then it’s not worth taking, but if it’s working well and side effects are minimal then take it and monitor along the way.

Before going on a clen cycle, why not spend some time doing your research? Weigh up all the pro’s and con’s and think about whether you really need it. If you're not sure then try a legal alternative first like clenbutrol which has some great reviews.

It's a personal choice and there’s no right or wrong providing you’ve made a calculated decision and take clen in a safe manner.

Can you take clenbuterol safely? To a degree yes, otherwise doctors wouldn't prescribe clenbuterol and other PED's to patients every day.

However, you can only take it safely if you're in good health beforehand, you take a low to moderate dose and perform short cycles.


Living The American Dream –

Performance Enhancing Drugs –

Case Studies of Clen –

Reducing Stomach Fat –

Banned Drugs and Athletes –

Side effects of Clen –

Phil learney – adaptive reserve books –

Jordan Peters' website

Death by weight loss pill –


Erny Peibst

Erny Peibst

Erny has over 5 years of experience of steroids and PED use in bodybuilding, Erny uses as a platform to share his valued knowledge and expertise.
Erny Peibst

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