Clenbuterol 40 mcg is a beta-2 adrenergic agonist originally developed as a bronchodilator for treating respiratory conditions such as asthma. While not approved for human use in several countries, it is widely used off-label in the fitness and bodybuilding community for its fat-burning and thermogenic properties.
Clenbuterol increases metabolic rate, stimulates fat loss, and enhances energy levels by mimicking adrenaline’s effects on beta-2 receptors.
Common Uses (Off-Label):
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Fat loss and body recomposition during cutting phases
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Appetite suppression
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Increased aerobic capacity
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Preservation of lean muscle mass while dieting
How It Works:
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Stimulates beta-2 receptors, increasing body temperature and metabolism
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Promotes lipolysis (breakdown of stored fat)
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Mild anabolic effects in some studies (though not its primary benefit)
Typical Dosage & Administration (Off-Label Use):
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Start with 20–40 mcg per day
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Gradually increase every few days (up to 120–160 mcg max for men; less for women)
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Common cycle: 2 weeks on / 2 weeks off, or pyramid-style taper
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Take in the morning to reduce sleep disruption due to stimulant effects
Note: Always start at a low dose to assess tolerance.
Side Effects:
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Common: Tremors, increased heart rate, sweating, anxiety, insomnia, muscle cramps
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Serious (at high doses): Heart palpitations, high blood pressure, electrolyte imbalance
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Tolerance builds quickly – necessitating breaks or rotation with other compounds
Warnings & Precautions:
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Not approved for human use in some countries (e.g., U.S.)
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Use is banned in most sports organizations (WADA prohibited list)
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Not recommended for individuals with heart problems, hypertension, or thyroid disorders
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Must be used responsibly; misuse may cause serious cardiovascular risks
Storage:
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Store at room temperature (15–25°C / 59–77°F)
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Keep away from heat, moisture, and direct light
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Keep out of reach of children
