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Clenbuterol is illicitly used in bodybuilding for its ability to reduce body fat and increase lean muscle mass, a process known as repartitioning. It is not approved for human use in the United States and is a prohibited substance in professional sports due to significant health risks and a lack of human safety data.
Purported Effects in Bodybuilding
Bodybuilders and athletes misuse clenbuterol (often called “clen”) for the following perceived effects:
Fat Burning (Lipolysis): Clenbuterol is a stimulant that increases the body’s resting metabolic rate and enhances fat oxidation, helping to burn more calories and reduce body fat.
Muscle Building (Anabolic/Anti-catabolic): It can increase lean muscle mass and prevent muscle loss (catabolism), particularly when dieting or “cutting”.
Enhanced Performance: By acting as a bronchodilator, it opens airways, which users believe increases oxygen flow and improves stamina and exercise performance, although studies suggest it may actually impair cardiorespiratory fitness




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