Clenbuterol
Beta-2 Agonist | Thermogenic Fat Loss
Clenbuterol is a potent, long-acting beta-2 adrenergic receptor agonist originally developed for the treatment of asthma and other respiratory conditions. It is approved as a bronchodilator in many countries throughout Europe, Latin America, and Asia, but has never been approved for human use in the United States, where it is only approved for veterinary use in horses (Ventipulmin). In the context of bodybuilding and physique sports, clenbuterol is widely used as a thermogenic agent during cutting phases to accelerate fat loss while preserving lean muscle mass. Its stimulatory effects on the sympathetic nervous system increase basal metabolic rate, core body temperature, and lipolysis. Unlike anabolic steroids, clenbuterol does not directly promote muscle growth in humans at typical doses, though animal studies have demonstrated significant anabolic effects in livestock, which led to its controversial use in meat production in some countries.
Moleküler Gösterim
M.W.: 277.19 Da
PubChem 2D yapı diyagramı
Referans Flakon
Referans illüstrasyonu — ürün listesi değildir
Etki Mekanizması
Clenbuterol selectively binds to beta-2 adrenergic receptors on cell surfaces, activating adenylyl cyclase and increasing intracellular cyclic adenosine monophosphate (cAMP) concentrations. Elevated cAMP activates protein kinase A (PKA), which phosphorylates hormone-sensitive lipase (HSL) in adipose tissue, directly stimulating lipolysis and the release of free fatty acids for oxidation. In smooth muscle tissue, beta-2 activation causes relaxation of bronchial airways, which accounts for its therapeutic use in asthma. Clenbuterol also stimulates mitochondrial uncoupling and increases thermogenesis, raising basal metabolic rate by an estimated 5-10%. Additionally, clenbuterol has mild anti-catabolic properties in humans, potentially reducing muscle protein breakdown during caloric restriction through beta-2 receptor-mediated inhibition of the ubiquitin-proteasome pathway. A significant limitation is the downregulation of beta-2 receptors with continuous use, typically occurring within 2-3 weeks, which diminishes the thermogenic effect and necessitates cycling protocols or co-administration of ketotifen (an antihistamine that upregulates beta receptors).
Clenbuterol is a potent, long-acting beta-2 adrenergic receptor agonist originally developed for the treatment of asthma and other respiratory conditions. It is approved as a bronchodilator in many countries throughout Europe, Latin America, and Asia, but has never been approved for human use in the United States, where it is only approved for veterinary use in horses (Ventipulmin). In the context of bodybuilding and physique sports, clenbuterol is widely used as a thermogenic agent during cutting phases to accelerate fat loss while preserving lean muscle mass. Its stimulatory effects on the sympathetic nervous system increase basal metabolic rate, core body temperature, and lipolysis. Unlike anabolic steroids, clenbuterol does not directly promote muscle growth in humans at typical doses, though animal studies have demonstrated significant anabolic effects in livestock, which led to its controversial use in meat production in some countries.
Moleküler Veri
Araştırma Endikasyonları
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Doz Protokolleri
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| Hedef | Doz | Sıklık | Yol |
|---|---|---|---|
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Etkileşimler
Anabolic Steroids
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Kaynaklar
- Clenbuterol: a beta-2-agonist with unusual effects on thermogenesis — Stock, M.J., Rothwell, N.J.
- Clenbuterol in asthma. Preliminary report of a new, orally effective, selective beta-2 adrenostimulant — Anderson, G.P.
- Acute clenbuterol overdose resulting in supraventricular tachycardia and atrial fibrillation — Hoffman, R.J., Hoffman, R.S., Freyberg, C.L., et al.
- Beta-2 agonists and their effects on body composition and protein synthesis — Choo, J.J., Horan, M.A., Little, R.A., Rothwell, N.J.
- Clenbuterol residues in food producing animals: a toxicological and public health concern — Barbosa, J., Cruz, C., Martins, J., et al.