Across 61 first-hand reports, people mentioned a side effect 10 times (about 16 per 100 reports). The most common: jitteriness, sweating, heart strain. User reports show what people notice — they can't tell you whether Clenbuterol is safe for you.
“I got some Clen from them and using 100mcg a day and have not felt or seen a thing.”
“I've always been a fan of thermogenic compounds ,such as Clenbuterol and other ECA stacks, but they were way to stimulating where's C3G/BG are a very clean mood enhancement.”
“yeah i use clen myself. But clen is very harsh on the heart. At the moment i'm using it EOD at low dose.”
“I was thinking clenbuterol cycle plus semaglutide dose combined with 1500 Calories deficits”
“I almost died from clenbuterol , I had 187bpm at rest in class 2 hours after I took it. Only like 10MCG. I cramped so bad in my quads”
“When I would run Clen I would do 2 weeks on and 2 weeks off. The benefits and it basically keeps your health in mind while running it”
Conclusion: Clenbuterol is notorious to produce life-threatening adverse events including death. Lack of evidence regarding the performance-enhancing effects of clenbuterol combined with its serious toxicities questions the usefulness of this drug in athletes.
Conclusion: There was weak evidence to suggest that use of an adrenergic agonist was better than placebo treatment. There was not enough evidence to assess the effects of adrenergic agonists when compared to or combined with other treatments. Further larger trials are needed to identify when adrenergics may be useful. Patients using adrenergic agonists may suffer from minor side effects, which sometimes cause them to stop treatment. Rare but serious side effects, such as cardiac arrhythmias and hypertension, have been reported.