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In page Clenbuterol:

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Although often used by bodybuilders during their "cutting" cycles,[1] the drug has been more recently known to the mainstream, particularly through publicized stories of use by celebrities such as Victoria Beckham,[2] Britney Spears, and Lindsay Lohan, [3] for its off-label use as a weight-loss drug similar to usage of other sympathomimetic amines such as ephedrine, despite the lack of sufficient clinical testing either supporting or negating such use.