Clenbuterol 40mcg · 100 Tablets
Clenbuterol 40mcg – 100 Tablets
Clenbuterol, commonly called Clen, is a long-acting beta-2 adrenergic agonist used in bodybuilding and physique sports during cutting phases. It is not an anabolic steroid. Each tablet contains 40mcg of Clenbuterol, with 100 tablets per bottle.
40mcg per tablet
100 tablets
Beta-2 adrenergic agonist
Clen / Clenbuterol
Quick reference
Clenbuterol Dosage
20mcg
½ tablet per day
40mcg
1 tablet per day
80mcg
2 tablets per day
~35 hours
Reported plasma half-life
Clenbuterol lasts much longer than many users expect. Human pharmacokinetic research found an approximate 35-hour plasma half-life, so the previous day’s dose is still present when the next dose is taken.[1]
| Days | Current Thai Anabolics Example |
|---|---|
| 1–3 | 20mcg/day |
| 4–6 | 30mcg/day |
| 7–9 | 40mcg/day |
| 10–12 | 50mcg/day |
| 13–15 | 60mcg/day |
| 16–18 | 70mcg/day |
| 19–21 | 80mcg/day |
| 22–24 | 90mcg/day |
| 25–27 | 100mcg/day |
| 28–30 | 110mcg/day |
The body can become less responsive to repeated beta-2 stimulation. A recent randomized human trial found that muscle beta-2 adrenergic signalling was attenuated after two weeks of Clenbuterol exposure.[2] That tolerance effect is real, but it should not be interpreted as proof that continually increasing the dose is automatically appropriate.
Duration
Clenbuterol Cycle Length
Common short cycle: 2–4 weeks
Shorter cycles are common because beta-2 receptor signalling becomes less responsive with repeated exposure and because Clenbuterol has a long elimination half-life.[1][2]
Not a steroid
Does Clenbuterol Need PCT?
No PCT is required for Clenbuterol itself. Clenbuterol is a beta-2 agonist, not an anabolic-androgenic steroid, so it does not suppress testosterone through the same mechanism as anabolic steroids.
If Clenbuterol is used alongside suppressive compounds such as Anavar, Winstrol or injectable anabolic steroids, PCT decisions depend on those compounds rather than the Clenbuterol.
Cutting and body composition
Why Clenbuterol Is Used During Cutting
Clenbuterol stimulates beta-2 adrenergic receptors and can increase energy expenditure. In a randomized crossover trial, 40mcg/day for two weeks increased basal and sleeping metabolic rate in healthy young men.[3]
Human evidence is more nuanced than the common “fat burner” label suggests. A newer randomized trial using 80mcg/day for two weeks found a significant increase in lean mass and muscle protein content.[2]
For bodybuilding clients, Clenbuterol is therefore best understood as a beta-2 agonist commonly used in cutting phases because of its effects on metabolic rate and body-composition signalling—not as a guaranteed standalone fat-loss drug.
Common combinations
Stacking Clenbuterol
Cutting: Clenbuterol is commonly combined with Anavar, Winstrol, Tren A or Masteron.
Bulking: Clenbuterol is much less commonly selected for bulking because its primary bodybuilding role is during cutting and body-composition phases.
Long half-life
Once-Daily vs Split Dosing
Human studies report a plasma half-life of about 35 hours, with peak concentrations reached within roughly 2.5 hours after an oral dose.[1]
Because the compound remains in the body for a long time, splitting a daily amount into frequent doses is not required simply to keep Clenbuterol active throughout the day.
Independent product testing
Clenbuterol Lab Report
The current Clenbuterol sample linked on the live product page was independently tested by OnSet Labs using HPLC.
OnSet Biological Testing Laboratory
25-714920
7 March 2025
NKS0824
Clenbuterol Hydrochloride (HPLC)
41.56mcg/tablet
Specification: NLT 40mcg/tablet
Important practical consideration
Clenbuterol Has Strong Cardiovascular Effects
Clenbuterol is a sympathomimetic beta-2 agonist, so effects such as increased heart rate, tremor, restlessness and muscle cramping are well documented in human research. In a controlled 40mcg/day trial, reported effects included hand tremor, muscle aches or cramps, anxiety/restlessness and headache.[3]
A systematic review of adverse events among athletes found that cardiovascular complications were the most frequently reported serious problems associated with Clenbuterol misuse, including tachyarrhythmias, myocardial injury and cardiomyopathy.[4]
This is also why the old product-page statement describing 120–160mcg/day as a universal “maximum dosage” has not been carried forward. Published evidence does not establish that range as a generally safe maximum.
Thailand delivery
Buy Clenbuterol 40mcg in Thailand
Thai Anabolics supplies Clenbuterol 40mcg tablets from stock within Thailand with free Thailand shipping. Each bottle contains 100 tablets. Current price and stock are always shown in the purchase section at the top of this page.
Sources
Clenbuterol Sources
- Yamamoto I, Iwata K, Nakashima M. Pharmacokinetics of plasma and urine clenbuterol in man, rat, and rabbit. J Pharmacobiodyn. 1985;8(5):385–391. Human dosing data showed peak plasma levels within about 2.5 hours and an estimated plasma half-life of approximately 35 hours. View on PubMed
- Hostrup M, et al. Clenbuterol induces lean mass and muscle protein accretion, but attenuates cardiorespiratory fitness and desensitizes muscle beta-2 adrenergic signalling. J Physiol. 2025. Randomized placebo-controlled human study using 80mcg/day for two weeks. View on PubMed
- Jessen S, et al. Effect of beta-2-agonist treatment on insulin-stimulated peripheral glucose disposal in healthy men in a randomised placebo-controlled trial. Nature Communications. 2023. The study used Clenbuterol 40mcg/day for 14 days and measured metabolic, cardiovascular and reported side-effect outcomes. View full text
- Kumari S, et al. Adverse events of clenbuterol among athletes: a systematic review of case reports and case series. Int J Legal Med. 2023;137(4):1023–1037. View on PubMed
Written by
Adrian
Adrian writes practical, experience-led content covering cutting compounds, bodybuilding, performance enhancement and the fitness industry in Thailand. On this page, the focus is Clenbuterol dosage, cycle length, cutting use, pharmacokinetics, stacking, cardiovascular considerations and independent batch testing.
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