View Report
January 08, 2025
Measured Result 45.30 mcg 113.25% of label claim
British Dragon
British Dragon
Latest Laboratory Result 45.30 mcg January 8, 2025 · 113.25% of label claim View
Clenbuterol 40 mcg
Product Information Compound Details
Active Substance Clenbuterol Hydrochloride β2-Adrenergic Receptor Agonist
40 mcgStrength 40 mcg/tablet
Package 100 Tablets
Form Oral Tablets
Drug Class β2-Adrenergic Agonist
Receptor Target β2-Adrenergic Receptor
Manufacturer British Dragon
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Product Overview
Clenbuterol 40 mcg by British Dragon
Clenbuterol 40 mcg is an oral beta-2 adrenergic agonist tablet manufactured by British Dragon and dosed at 40 mcg per tablet, supplied in packs of 100 tablets.
Clenbuterol Hydrochloride Oral
Clenbuterol 40 mcg contains clenbuterol hydrochloride, a selective beta-2 adrenergic agonist with bronchodilator and thermogenic properties. It is approved by the FDA for veterinary use in horses under the brand name Ventipulmin for the management of airway obstruction associated with chronic obstructive pulmonary disease.
In non-medical bodybuilding and fitness contexts, clenbuterol is commonly referenced for its purported fat-burning and lean mass-preserving effects during cutting phases. However, controlled human research demonstrates that clenbuterol at 80 mcg daily for 2 weeks produces only modest lean mass gain (0.91 kg) with no effect on fat mass, while reducing maximal oxygen uptake by 7% and exercise capacity by 4%.
Clenbuterol is not approved for human use in the United States and is prohibited by the World Anti-Doping Agency under section S1.2 (Other Anabolic Agents) at all times, both in-competition and out-of-competition. Such use falls outside approved indications and carries significant cardiovascular risks.
Key Properties of Clenbuterol 40 mcg
- Selective beta-2 adrenergic agonist with bronchodilator properties
- FDA-approved for veterinary use in horses only
- Investigated for potential anabolic effects in preclinical models
- 100 tablet pack size supports extended research protocols
- Lab tested at 45.30 mcg per tablet (113.25% of label claim)
Product Profile
Clenbuterol Hydrochloride Profile
Clenbuterol hydrochloride is a selective beta-2 adrenergic agonist that produces bronchodilation and has been investigated for effects on muscle protein metabolism in preclinical research.
Beta-2 Adrenergic Agonist
Clenbuterol works by selectively binding to beta-2 adrenergic receptors, which are found in smooth muscle of the airways, skeletal muscle, and adipose tissue. Activation of these receptors produces bronchodilation and may influence metabolic processes. The compound has a long duration of action compared to shorter-acting beta-2 agonists.
Preclinical research in animal models has explored clenbuterol's effects on muscle growth and body composition. Studies in rats, calves, and lambs have demonstrated increased muscle protein accretion and reduced fat deposition at certain doses. However, these effects have not been consistently replicated in controlled human trials.
A 2025 randomized controlled trial in healthy men using 80 mcg daily for 2 weeks demonstrated only modest lean mass gain (0.91 kg) with no fat mass reduction, alongside reduced cardiorespiratory fitness and rapid desensitization of beta-2 adrenergic signaling.
Regulatory Status
Veterinary-Approved Only — Not for Human Use
Clenbuterol is FDA-approved only for veterinary use in horses for the management of airway obstruction. It is not approved for human use in the United States, and there is no therapeutic use exemption available for athletes under WADA rules.
Clenbuterol 40 mcg vs Other British Dragon Preparations
British Dragon offers several ancillary compounds used in non-medical bodybuilding contexts. T3 contains liothyronine, a thyroid hormone sometimes referenced alongside clenbuterol in cutting protocols. For post-cycle therapy, Clomiphene and Tamoxifen are commonly referenced for restoring endogenous testosterone production.
Clenbuterol's mechanism as a beta-2 agonist is distinct from thyroid hormones and selective estrogen receptor modulators. Its primary research applications have focused on bronchodilation and metabolic effects, though human data for performance outcomes remains limited.
Laboratory Testing
Clenbuterol 40 mcg Lab Reports
Published laboratory reports for Clenbuterol 40 mcg are shown below with the test date, measured result and percentage of the product's 40 mcg label claim.
View Report
Laboratory results apply to the specific tested sample represented in each published report and should not be interpreted as a measurement of every tablet or production batch.
Dosage & Usage
Clenbuterol 40 mcg Dosage & Usage
The information below is provided for educational reference only. Clenbuterol is not approved for human use in the United States; medical use is not applicable, and non-medical use falls outside approved indications.
Typical Dosage Ranges
Clenbuterol is approved only for veterinary use in horses, with an FDA-approved dosing regimen for equine chronic obstructive pulmonary disease starting at 0.8 mcg/kg orally twice daily. In non-medical human contexts, community-reported protocols typically reference doses ranging from 20 mcg to 120 mcg daily, with some reports of doses as high as 30 mg in misuse cases.
| Use Case | Common Reference Range | Frequency |
|---|---|---|
| Veterinary (horses, FDA-approved) | 0.8–3.2 mcg/kg | Twice daily |
| Non-medical human use (reported) | 20–120 mcg daily | Titrated over 2 weeks |
| Misuse (documented toxicity cases) | Up to 30 mg daily | Single or repeated ingestion |
These non-medical ranges represent community-reported practices and are not derived from controlled clinical trials for performance enhancement. A 2025 human trial demonstrated that 80 mcg daily for 2 weeks reduced exercise capacity and maximal oxygen uptake, indicating that clenbuterol impairs rather than improves athletic performance.
Stacking & Cycle Considerations
In non-medical bodybuilding contexts, clenbuterol is sometimes referenced alongside T3 in cutting protocols, though this combination compounds cardiovascular risk. Community protocols often reference 2-week cycles to mitigate receptor desensitization, followed by 2 weeks off or substitution with other compounds.
Controlled research demonstrates that beta-2 adrenergic signaling desensitizes rapidly during clenbuterol use, with the anabolic signaling response attenuating during just a 2-week cycle. This means any initial effects diminish quickly, requiring dose escalation that further increases toxicity risk.
Managing Side Effects
Clenbuterol misuse causes severe cardiovascular adverse events, including supraventricular tachycardia, atrial fibrillation, myocardial injury, myocarditis, and myocardial infarction. Other serious effects include hypokalemia (potassium as low as 2.0 mmol/L), hyperglycemia, muscle tremors, and nervousness.
A 2025 randomized controlled trial demonstrated that clenbuterol at 80 mcg daily reduced maximal oxygen uptake by 7% and exercise capacity by 4%, while repressing muscle oxidative capacity. These findings directly contradict the purported performance-enhancing effects that drive non-medical use.
Important
Individual Response Varies
Clenbuterol has no approved human dosing. Any information about non-medical use is derived from user-reported practices and is not validated by controlled clinical research. This information does not constitute medical advice.
Safety & Information
Clenbuterol Hydrochloride Safety Information
Clenbuterol is not approved for human use and carries significant cardiovascular risks. It is prohibited by WADA at all times and has no therapeutic use exemption.
Important Safety Information
Clenbuterol is FDA-approved only for veterinary use in horses for the management of airway obstruction. There is no legitimate medical indication for clenbuterol in human medicine, and it is not approved for human use in the United States.
Historical small studies explored clenbuterol in muscular dystrophy and post-prostatectomy incontinence, but these remain experimental with no established dosing protocols or regulatory approval. Any consideration of clenbuterol use in humans should be redirected to approved alternatives for the specific condition in question.
Important
Non-Medical Use
Non-medical use of clenbuterol falls outside approved indications and carries significant cardiovascular risks. Product purity does not establish that non-medical use is safe or appropriate for an individual.
Potential Adverse Effects
Clenbuterol misuse causes severe cardiovascular adverse events. Documented complications include supraventricular tachycardia, atrial fibrillation, myocardial injury, myocarditis, myocardial infarction, cardiomyopathy, chest pain, and hypotension. A case report documented troponin elevation to 5.39 µg/L and severe hypokalemia (2.0 mmol/L) in a 23-year-old male who ingested 5000 mcg.
Other serious effects include hepatomegaly, hyperglycemia, muscle tremors, nervousness, and agitation. The 2025 RCT demonstrated that clenbuterol reduced maximal oxygen uptake by 7% and exercise capacity by 4%, while repressing muscle oxidative capacity.
Beta-2 adrenergic signaling desensitizes rapidly during clenbuterol use, with the anabolic signaling response attenuating during just a 2-week cycle. This means any initial effects diminish quickly, requiring dose escalation that further increases toxicity risk.
Conditions Requiring Medical Evaluation
Clenbuterol should not be used in individuals with cardiovascular disease, hypertension, arrhythmias, or hyperthyroidism. The veterinary label states that VENTIPULMIN Syrup should not be used in horses suspected of having cardiovascular impairment because tachycardia may occur.
Competitive athletes should be aware that clenbuterol is prohibited by the World Anti-Doping Agency under section S1.2 (Other Anabolic Agents) at all times, both in-competition and out-of-competition. There is no threshold below which clenbuterol is not prohibited, and no therapeutic use exemption is available.
Monitoring During Therapy
Because clenbuterol has no approved human therapeutic use, no standardized monitoring protocols exist for non-medical use. In documented toxicity cases, monitoring includes cardiac enzymes (troponin), electrolytes (particularly potassium), blood glucose, and lactate. Treatment of toxicity requires supportive care with intravenous fluids, beta-blockers, benzodiazepines for agitation, and aggressive potassium replacement.
Product Care
Storage & Handling
Store tablets in a cool, dry place in the original packaging. Keep out of reach of children. Inspect tablets before use and do not use if they appear damaged or compromised.
Further Safety Information
Shipping & Authenticity
Shipping & Product Authenticity
Clenbuterol 40 mcg is supplied through the official British Dragon distribution chain and shipped in original manufacturer packaging with discreet, privacy-focused handling.
USA Domestic 3–5 business days
International 10–15 business days
Order Processing 24–48 business hours
Tracking Provided after dispatch
Direct Supply
Discreet Delivery & Original Packaging
The outer shipping package remains discreet, with privacy-focused handling and no unnecessary external product details. Products are supplied through the official British Dragon distribution chain.
What to Expect
- Orders are processed after payment confirmation
- USA Domestic shipping is typically faster when local stock is selected
- International orders include tracking, though update frequency may vary by destination
- Multiple warehouses may result in separate shipments when applicable
Authenticity Verification
To verify your Clenbuterol 40 mcg product, use the security code on the packaging and cross-check it on the British Dragon official site. Official British Dragon presentation and original packaging help reinforce product legitimacy and buyer confidence.
For complete delivery details, tracking policy, and reshipment terms, please see our Shipping Info page.
Storage
Clenbuterol 40 mcg Storage
Proper storage conditions help preserve tablet stability and overall product integrity throughout shelf life.
Recommended Conditions
Store at controlled room temperature (15–25°C) in a cool, dry place, away from direct light and moisture. Keep tablets in their original blister packaging or container until use to protect from humidity.
Inspect tablets before use and do not use if they appear discolored, cracked, or otherwise compromised. Keep out of reach of children.
Quick Reference
Do & Don't
- Do store at 15–25°C
- Do keep in original packaging
- Do inspect before each use
- Don't expose to direct sunlight or moisture
- Don't store in bathroom or humid areas
- Don't use if tablets appear abnormal
Frequently Asked Questions
Clenbuterol 40 mcg FAQ
Answers to common questions about Clenbuterol 40 mcg, the Clenbuterol Hydrochloride compound, and its applications.
What is Clenbuterol 40 mcg used for?
Clenbuterol 40 mcg contains the beta-2 agonist clenbuterol hydrochloride. It is FDA-approved only for veterinary use in horses for the management of airway obstruction. In non-medical bodybuilding contexts, it is commonly referenced for purported fat-burning effects, though controlled research shows no fat mass reduction and reduced exercise capacity at 80 mcg daily.
How often should Clenbuterol 40 mcg be taken?
There is no approved human dosing schedule for clenbuterol. In non-medical contexts, community-reported protocols typically reference doses of 20–120 mcg daily, titrated over 2 weeks. The FDA-approved veterinary dose for horses starts at 0.8 mcg/kg twice daily. A 2025 human trial used 80 mcg daily for 2 weeks.
Does Clenbuterol 40 mcg require PCT?
Clenbuterol is not an anabolic steroid and does not suppress endogenous testosterone production. Post-cycle therapy is not applicable to clenbuterol in the context of hormonal recovery. In non-medical settings, PCT protocols typically involve Clomiphene or Tamoxifen after anabolic steroid cycles.
What does Clenbuterol Hydrochloride do?
Clenbuterol is a selective beta-2 adrenergic agonist that produces bronchodilation. It binds to beta-2 receptors in smooth muscle of the airways, skeletal muscle, and adipose tissue. Preclinical research explored effects on muscle growth and fat reduction, but controlled human trials have not demonstrated meaningful performance or fat-loss benefits.
How long does Clenbuterol take to work?
Bronchodilation occurs rapidly after administration, but beta-2 adrenergic signaling desensitizes within 2 weeks of continuous use. A 2025 human trial demonstrated that any initial anabolic signaling response attenuates during a 2-week cycle, meaning effects diminish quickly and require dose escalation that increases toxicity risk.
Is Clenbuterol the best fat burner?
No major obesity management guidelines include clenbuterol as a recommended pharmacotherapy option. A 2025 randomized controlled trial demonstrated no fat mass reduction with clenbuterol at 80 mcg daily for 2 weeks, while maximal oxygen uptake decreased by 7% and exercise capacity decreased by 4%.
What is the difference between Clenbuterol and T3?
Clenbuterol and T3 have different mechanisms. Clenbuterol is a beta-2 adrenergic agonist, while T3 contains liothyronine, a thyroid hormone. In non-medical cutting protocols, the two are sometimes referenced together, though this combination compounds cardiovascular risk.
What is the difference between Clenbuterol and Anastrozole?
Clenbuterol and Anastrozole have entirely different mechanisms and applications. Clenbuterol is a beta-2 agonist referenced for purported metabolic effects, while anastrozole is an aromatase inhibitor used to manage estrogenic side effects from aromatizing steroids. They are not interchangeable.
Is 40 mcg of Clenbuterol a lot?
Clenbuterol 40 mcg is labeled at 40 mcg of clenbuterol hydrochloride per tablet. In non-medical contexts, 40 mcg is commonly referenced as a starting dose in community protocols. A 2025 human trial used 80 mcg daily, which is double this tablet strength, and demonstrated reduced exercise capacity.
What strength is Clenbuterol 40 mcg?
Clenbuterol 40 mcg is labeled at 40 mcg of clenbuterol hydrochloride per tablet. It is supplied as oral tablets in packs of 100 tablets manufactured by British Dragon.
Is Clenbuterol 40 mcg lab tested?
Yes. A published laboratory report dated January 08, 2025 measured Clenbuterol 40 mcg at 45.30 mcg, equivalent to 113.25% of its 40 mcg label claim. The complete report can be viewed in the Lab Reports tab.
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