Clenbuterol is a compound that belongs to a class of drugs called beta2-agonists. Drugs in this category can cause dilation of the bronchial muscles. Beta2-agonists are often used to treat asthma.
In addition to being used to treat asthma, clenbuterol has become popular as a weight-loss supplement. That’s because of its effect on muscle growth and fat reduction.
Read on to learn more about the usage, safety, and side effects of this medication
Clenbuterol has been observed to both increase muscle mass and reduce body fat. Additionally, it remains in the body with an active effect for up to about six days after consumption (detectable traces can remain longer). Because of these properties, it’s often used as a weight-loss supplement or to enhance athletic performance.
People taking clenbuterol for weight loss or performance enhancement often use anabolic steroids or growth hormones as well.
Studies on the efficacy of clenbuterol as a weight-loss or performance enhancer in humans are quite limited, although many studies have been performed in animals and livestock:
ResearchersTrusted Source has observed that clenbuterol stimulates muscle growth and repair while preventing atrophy in mice and rats.
StudiesTrusted Source in livestock has indicated that the increase in muscle growth occurs at the expense of fat tissue. This is part of a process referred to as repartitioning.
A study trusted Source in horses found that long-term administration of high doses of clenbuterol increased the expression of genes related to various muscle components and fat metabolism.