Clenbuterol Introduction

Clenbuterol (AKA “Clen”) is not an anabolic steroid, but is commonly and wrongfully mistaken as one very frequently, especially amongst the uneducated public. It is in fact a stimulant, specifically known as a beta adrenergic sympathomimetic compound. Sympathomimetics are stimulants, and Clenbuterol will act as a stimulant in the central nervous system (CNS) in a variety of methods. Clenbuterol will act upon adrenoreceptors in many different tissues of the body to elicit various effects throughout, and there are many different adrenoreceptors numbering well over 10. Clenbuterol specifically binds to and activates Beta-2 receptors, and although it does activate other receptors in the body, Beta-2 receptors tend to be the primary receptor sites of interaction for Clenbuterol. This is why Clenbuterol is referred to as a Beta-2 receptor agonist, and it is the Beta-2 receptor on fat cells that Clenbuterol will activate in order to initiate lipolysis (fat breakdown). It is used primarily in medicine as an asthma medication, as its action on Beta-2 receptors along the bronchial tubes will allow bronchial dilation to occur, thus allowing more air to be able to pass through the airways into the lungs during an asthma attack. Other effects of Clenbuterol occur in other tissues, such as muscle tissue to a very small extent where studies have shown it to act as a very mild anabolic in animals. However, the fat loss is the primary reason for use among athletes and bodybuilders.


Clenbuterol Doses

Because Clenbuterol is primarily and almost solely used as a fat burning drug within the athletic world, its variety of use is very limited. With that being said, Clenbuterol doses are limited as well with only a dosage window that can be adjusted up and down within this window according to the user’s gender or size. For example, female users because of their smaller body mass, will likely be able to tolerate less Clenbuterol than men. The same can be said for Clenbuterol doses and smaller males. Clenbuterol doses are measured in mcg (micrograms) instead of mg (milligrams), which is what most people are used to encountering when dosing different performance enhancing drugs. Doses of Clenbuterol for medical purposes in the treatment of asthma are in the range of 20 – 40mcg per day. For fat loss, an optimal peak dose for most people is 120 – 160mcg per day, but it is very important for people to start off at about 40mcg per day and slowly increase the dose every 2 – 3 days upwards by 20mcg each time until the peak optimal dose is reached. Some might find that they are very sensitive to Clenbuterol doses and wish to stop at 100mcg per day, and others might be able to rise as high as 160mcg per day. The idea is for each person to find their tolerance and stick with the same dose of Clenbuterol.

Clenbuterol Cycles

Clenbuterol cycles are a very basic concept, due to the fact that as previously mentioned, Clenbuterol is a drug with very limited variation in use. It is a fat burner, and as such, Clenbuterol cycles are very straightforward. Cycles of Clenbuterol can also include anabolic steroids within them, or even be stacked with other fat burners, such as T3. However, it is not recommended that any individual combine Clenbuterol with another fat burner that is a stimulant due to the compounding effects of the two stimulants. Blood pressure issues can arise, and the overall increased risk of cardiovascular problems will become prominent as a result. It is also advised to run Clenbuterol cycles for periods of no longer than 8 – 10 weeks at a time (if up-regulating receptors with Ketotifen), or 4 weeks on followed by 4 weeks off in order to allow Beta-2 receptors to recover and up regulate following the down regulation during use (which becomes severe by about the 4th week). Normally once Beta-2 receptors become down regulated from consistent Clenbuterol use, fat loss will slowly grind to a halt at the 4 week mark, and is also associated with a drop in body temperature (due to the metabolism returning to baseline levels). The following are some samples of Clenbuterol cycles:

Sample Clenbuterol cycle (10 weeks total cycle time)
Weeks 1 – 10:
– Testosterone Enanthate at 500mg/week
– Clenbuterol at 120mcg/day (peak dose)
– Keotifen every 2nd or 3rd week of Clenbuterol use at 2mg/day for 7 days

Sample Clenbuterol cycle (8 weeks total cycle time)
Weeks 1 – 8:
– Testosterone Propionate at 400mg/week
– Trenbolone Acetate at 100mg every other day
– Clenbuterol at 140mcg/day (peak dose)
– Keotifen every 2nd or 3rd week of Clenbuterol use at 2mg/day for 7 days

Sample Clenbuterol cycle (12 weeks total cycle time)
Weeks 1 – 8:
– Testosterone Enanthate at 400mg/week
– Deca Durabolin at 400mg/week
Weeks 1 – 4 and 8 – 12:
– Clenbuterol at 120mcg/day (peak dose)

Clenbuterol Side Effects

Clenbuterol carries various side effects that are very different and distinctly separate from anabolic steroids. Because it is a stimulant, Clenbuterol side effects are very indicative of a stimulant type of side effect. These include tremors (shaking of the hands), insomnia (the inability to sleep), sweating (resulting from increased metabolic rate), anxiety and nervousness, increased blood pressure, headaches, nausea, and muscle cramping. Muscle cramping is one key side effect that is very indicative of Clenbuterol and other similar Beta-adrenergic sympathomimetics. Clenbuterol will cause a depletion of the amino acid known as taurine in the body, which is an amino acid responsible for proper regulation of the bioelectrical nerve impulses which serve to govern the contraction of muscle tissue. The result can be sporadic cramping of muscles, which is easily remedied by the additional supplementation of taurine during the use of Clenbuterol.

Buying Clenbuterol

Clenbuterol is perhaps the most popular and one of the most commonly used fat burning agents in the world next to Ephedrine. Those looking to buy Clenbuterol will discover that it is very easily accessible and is in fact legal to possess and use in almost every country in the world. Clenbuterol can be located from 4 primary source types: internet sources that set minimum order limits, internet sources that do not set minimum order limits, in-person sources, and research chemical companies. Internet sources that set minimum order limits are almost the exact same as in-person sources, where the purchasing of product in larger bulk quantities will result in an overall lower cost of product per unit. Internet sources that do not limit buyers to minimum order limits will allow people to buy Clenbuterol in smaller amounts, but at the expense of a higher price. Research chemical companies are simply legal companies that sell Clenbuterol legally, but it is not for human consumption and is instead for research purposes only. As far as product type and quality goes, there are three primary product grades when shopping around to buy Clenbuterol: pharmaceutical grade, underground lab (UGL) grade, and research chemical grade. Pharmaceutical Clenbuterol is manufactured by a government approved pharmaceutical company, and so sterility and product purity is guaranteed at the expense of higher costs. UGL grade products of course do not possess such quality guarantees, but result in lower prices/costs. Research chemical companies are known to vary in quality and price between the previously mentioned two grades depending on the company in question, although research chemical companies have no governing body that monitors or overlooks them.

Price wise, people who wish to buy Clenbuterol will find that pharmaceutical grade product is extremely common and that Clenbuterol over all is a very cheap product to locate. Pharmaceutical grade, depending on the source in question, will normally sell it for $0.4 – $1 per tablet, depending on which pharmaceutical grade product is being sold as well. UGL Clenbuterol, again depending on the source type, will normally sell for $0.4 – $2 per tablet, and these tablets can range in strength/concentration from 40mcg to 100mcg per tablet. Pharmaceutical grade standard is usually 20mcg tablets. Shoppers looking to buy Clenbuterol that is research chemical grade will find that is normally sold in liquid format typically dosed at 200mcg/ml in a 30ml bottle sold for anywhere between $40 – $80 per bottle, depending on which research chemical company it is bought from.


  1. Clenbuterol increases lean muscle mass but not endurance in patients with chronic heart failure. Kamalakkannan G, Petrilli CM, George I, LaManca J, McLaughlin BT, Shane E, Mancini DM, Maybaum S. J Heart Lung Transplant. 2008 Apr;27(4):457-61. doi: 10.1016/j.healun.2008.01.013.

2. Effect of clenbuterol on cardiac and skeletal muscle function during left ventricular assist device support. George I, Xydas S, Mancini DM, Lamanca J, DiTullio M, Marboe CC, Shane E, Schulman AR, Colley PM, Petrilli CM, Naka Y, Oz MC, Maybaum S. J Heart Lung Transplant. 2006 Sep;25(9):1084-90.

3. Myocardial Ischemia Associated with Clenbuterol Abuse: Report of Two Cases. J Emerg Med. 2012 May 24. Huckins DS, Lemons MF. Department of Emergency Medicine, Newton-Wellesley Hospital, Newton, Massachusetts.